154 



SHUFELDT. 



ing entirely over its superior convex aspect. From, before backward it 

 measures about 2 millimeters; transversely it averages 1 centimeter, 

 being very slightly larger at its inner than at its outer extremity; a 

 concavity occupies the entire surface of the former, while the latter is 

 blimtly rounded off. In ven^ old specimens, and perhaps in others, the 

 two limbs of the mandible after ijrolonged maceration part company 

 at the s}'mphysis, exposing there a roughened, subelliptical surface, whose 

 major axis is identical with the symphysial axis. 



THE TEtWK SKELETON. 



There has been given on a former page (p. 142) of the present 

 memoir, the number of vertebra in the spinal column of two species of 

 Cynocephalus, ar recorded by Flower, viz, three specimens of "G. volans" 

 and one specimen of "G. pliilippinensis." This second exliibits, if correct, 

 some remarkable variations in this part of the skeleton. 



Flower discovered 7 cervical yertebrje in all four of the specimens he 

 examined, while he found 13 thoracic in two "G. volans ;" 14 in another; 

 and 14 in "G. pliilippinensis." Still more remarkable is the record he 

 left with respect to the Irmibar vertebrse present in this animal, for in 

 "G. volans" these ranged 5, 6, and 8, while in the specim.en of "G. pliilip- 

 pinensis" there were 6 of these vertebrte. Coming to the sacrals, he 

 claims to have found 5 in two of "G. volans," 4 in another, and 4 in 

 "G. pliilippinensis." 



As Cynocephalus has a long slender tail, we are not greatly surprised 

 at any variation that may occur there, especially as some of these vertebrse 

 may be lost for one reason or another, and at the best they are likely to 

 vary somewhat in this division of the cohram. Flower found in "G. 

 volans" 14+, 15, and 17 caudal vertebraj, and 17+ in the specimen of 

 "G. pliilippinensis" he examined. Taking his total count for the vertebral 

 column it stands thus : "G. volans" 45+, 45, and 50, and for his specimen 

 of "G. pliilippinensis" 48+. In other words no two specimens, without 

 regard to species, were in agreement in this particular. 



Upon careful count, the three specimens here being examined show 

 the following for the number of vertebrte in the spiue : 



yumber of vertebrce in Cynocephalus. 



specimens, ^Tl. rISl?. 



Lum- 

 bar. 



Sacral. 



Caudal. 



Total. 





9 



3 



19+ 

 18+ 

 16+ 



51+ 

 49+ 



47+ 





8 3 



7 4 





IJlilBliU Ul ^UC ^^ . 1 1 







If by -a + in his account of the number of caudal vertebra present 

 Flower meant that certain terminal caudals were missiag, no such meaning 

 is here intended to be conveyed. In the above table a + does not mean 



