. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. B. 1 cm Figure 12. Reconstruction of the pectoral girdles of the three Ramon pipids. A. Cordicephalus longicostatus; B. Cord/cepho/us gracilis; C. r/iorocW/ocus rosfriceps. The cleithrum is indicated in black; the suprascapula is stip- pled. Skull. Shape variation is prominent in the frontoparietals, cohimella, and particu- larly in the squamosals. Remarkable in- dividual variation is found in the fronto- parietals. Four out of 62 specimens, or per cent, of ThoraciJiacus have a median suture in these usuallv azvgo
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. B. 1 cm Figure 12. Reconstruction of the pectoral girdles of the three Ramon pipids. A. Cordicephalus longicostatus; B. Cord/cepho/us gracilis; C. r/iorocW/ocus rosfriceps. The cleithrum is indicated in black; the suprascapula is stip- pled. Skull. Shape variation is prominent in the frontoparietals, cohimella, and particu- larly in the squamosals. Remarkable in- dividual variation is found in the fronto- parietals. Four out of 62 specimens, or per cent, of ThoraciJiacus have a median suture in these usuallv azvgous bones ( in F 42, 32, 148?, 258).'A small median oval foramen in specimens F 14, 54 ?, 56, 341 might represent the parietal foramen, which may not have been preserved in other specimens. Numerous small round holes show in each of the frontoparietals of six specimens (F 42, 45, 98, 133, 134, 213). Their nature is obscure. Teeth vary in number in the maxilla (33-37; mean = 35), and premaxilla (8-10). Vertebral column (Figs. 11, 14, 15). Size, shape, and meristic variation are evi- dent in each part of the column but are most striking in the urostyle. Eight pre- sacrals characterize all three species, yet one or two specimens (F 112, on Fig. 15, and 127 ?) out of 256, or per cent, have nine presacrals. All analyzable centra proved opisthocoelous in 261 skeletons, but many vertebrae are not determinable. The sacral diapophyses in 239 out of 250, or per cent, are symmetrically attached to the ninth vertebra. The remaining 11 specimens display individual variation of right-left asymmetry of the diapophyses on the ninth vertebra only, or involving the 8th, and 10th vertebrae, as well (Figs. 14, 15). Successive vertebrae are not fused throughout the column. Ribs display strik- ing individual variations in shape, size, and direction, and presumably age variation in fusions with their diapophyses. The older the animal the more fusions occur, partic- ularly in ribs 1 and 4.
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
