Diversity in the Scutes of Chelonia. 51 



12-13. The most abnormal carapace is that of ^o. 26 (Fig. 63), with 

 the large scute between neural and costal series, the small area in 

 the mesial posterior region without a horny covering, and the minute 

 scute that appears as if it were cut out of the left twelfth marginal. 

 These three abnormalities are each unique among my observations. 



The only striking abnormality noted, apart from scutes, was 

 in jSTo. 22, the fore feet of which were somewhat rudimentary. 



Three small embryos of this nest are not included in the tables. 

 One of these seems to have fi^e neurals, a second six, and the third 

 seven. The other scutes can not be distinguished with certainty. 



Table VII, x\, includes 21 embryos from two artificial nests, 

 the eggs of which came originally from a single natural nest. In 

 the table the first ten numbers are from one artificial nest. At the 

 time of removal it was noted that the eggs were much distended, and, 

 from the consequent crowding, more or less misshapen. One-half 

 of the eggs started development, but not more than one-fourth 

 were living on the 44th day. Two of the embryos were peculiarly 

 abnormal. JSTo. 36 shows an approach to the "cyclopean defect" 

 (cf. 91, 92), but its scutes are normal. ISTo. 35 (Figs. 6Q and 

 67) besides having a harelip, was characterized by a remarkable 

 foreshortening of the body; both heart and lungs are outside of the 

 umbilical opening; the carapace, which measures 10 mm. in length 

 and 17 in width, is almost regular and symmetrical, though its 

 marked deficiency in length is accompanied by a corresponding 

 reduction in the number of scutes in longitudinal series. As a trans- 

 verse series of scutes may be said to consist of one neural, a pair 

 of costals and two pairs of marginals, the shield is deficient by two 

 complete transverse series, less two marginals on the right side. The 

 inframarginal series are somewhat reduced, but the plastron has the 

 full number of scutes, including an intergular, often wanting, and 

 even one supernumerary scute posteriorly. 



Three other specimens are abnormal in respect of scutes of the 

 carapace, and one of these (jSTo. 43) possessed minute "supra- 

 marginals." 



The last 11 numbers in the table are from a different artificial 

 nest. Most of these eggs developed to some extent, but only half 



