. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. RAYMOND: NOTES ON THE ONTOGENY OF PARADOXIDES. 231 study these specimens, I supposed them to be the young of that species. That they do not belong to that species is, however, shown convincingly by the eyes. The adult of P. rugulosus has the palpebral lobes touching the glabella at their anterior ends and reaching the occipital furrow behind, while in the adult of P. spinosus the eye is much shorter, and does not reach either the glabella or the occipital furrow. Barrande has figured (Loc. cit., pi. 12, fig.

- Image ID: RGG1W5
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. RAYMOND: NOTES ON THE ONTOGENY OF PARADOXIDES. 231 study these specimens, I supposed them to be the young of that species. That they do not belong to that species is, however, shown convincingly by the eyes. The adult of P. rugulosus has the palpebral lobes touching the glabella at their anterior ends and reaching the occipital furrow behind, while in the adult of P. spinosus the eye is much shorter, and does not reach either the glabella or the occipital furrow. Barrande has figured (Loc. cit., pi. 12, fig.
Book Worm / Alamy Stock Photo
Image ID: RGG1W5
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. RAYMOND: NOTES ON THE ONTOGENY OF PARADOXIDES. 231 study these specimens, I supposed them to be the young of that species. That they do not belong to that species is, however, shown convincingly by the eyes. The adult of P. rugulosus has the palpebral lobes touching the glabella at their anterior ends and reaching the occipital furrow behind, while in the adult of P. spinosus the eye is much shorter, and does not reach either the glabella or the occipital furrow. Barrande has figured (Loc. cit., pi. 12, fig. 7) a specimen of P. spinosus with a glabella 4.5 mm. long in which the eyes have the same position as in the adult, while in the Museum series, specimens this size have the rugulosus type of long eyes. The thorax of P. pusillus is of the spinosus rather than the rugulosus type, but that is a character which might change readily during growth from a size of 4 mm. up to the size of the adult P. rugulosus. It is, however, possible that the young of the two species would be, in the earliest stages, in- distinguishable. Young Specimens of Paradoxides. Bohemia. Hydrocephalus car ens Barrande and Paradoxides inflatus Corda make a short series showing the early growth stages of some as yet unidenti- fied species. Barrande figures nine stages in the growth of H. car ens, the smallest specimen being 2 mm. long and the largest 4 mm. The thorax and pygidium together show three segments in the smallest. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum