52 Eobert E. Coker. 



(11 out of 24) were living on the 49tli day. The striking feature 

 of this small group of embryos is that more than half displayed small 

 scutes just above the marginals and always at the meeting point 

 of three scutes (Figs. 73, 74). For convenience these are termed in 

 the tables "supramarginals," though it is not intended thereby to 

 imply any homology between these anomalous scutes and the typical 

 supramarginals of Macroclemmys. The prevailing plan of marginals 

 is 13-13. 



Table VII, B, is based on 14 embryos from a nest transplanted at 

 the laboratory. Less than one-third of these eggs developed. Four 

 of the 14 are abnormal, in having supernumerary marginals (three 

 specimens), a symmetrical supernumerary neural (No. 60), or two 

 scutes in the place of normal RC5 (No. 60). The marginal plan, 

 13-13, prevails. The large number of marginals (15-14) in No. 

 60 is noteworthy. 



Table VII, C, includes 2 embryos and 7 new-bom turtles from 

 a nest transplanted at the laboratory. Three are abnormal, two of 

 these having the costal series more or less asymmetrical and, in 

 correlation with the costals, asymmetrical neural scutes. In one 

 specimen (78) two neural scutes, in another (73) three are not 

 completely separated from one another. 



Table VII, D. This is -a rather remarkable collection of embryos. 

 Of the 22 specimens 18 are "abnormal," and these include several that 

 are abnormal in scutes to a high degree. 



Four are markedly deformed. No. 93 (Fig. 89) is asymmetrical 

 and somewhat misshapen, and the number of marginals on the 

 right side is unusually small. Two of these (Nos. 91 and 92) have 

 an interesting deformity of the head. We are not concerned in this 

 place with the details of anatomy, but the external characters of 

 these specimens may be sketched briefly. The anterior mesial region 

 of the face is reduced. The eyes are thus brought close together, 

 or fused, and are enclosed by single upper and lower eyelids. The 

 single nostril opens at the end of a short snout above tlio upper eye- 

 lid. In one specimen the snout ]ioints anteriorly. In the other 

 it is, as it were, rolled back on the top of the head, the nostril 

 appearing on the dorsal side of the posterior end of the flattened 



