98 



NEW GENUS AND SPECIES OF MOLE. 



The aDterior lower incisor is like the first upper incisor in form and 

 shape. The second approaches the first in size, but is procumbent and 

 bears a triangular accessory cusp posteriorly. The canine is minute 

 and simple. It is procumbent, as are also the premolars. The first 

 premolar is larger than the first incisor and bears a rounded accessory 

 cusp posteriorly. The second is small and simijle. The third is the 

 largest tooth anterior to the true molars. It has a prominent posterior 

 accessory cusp. The molars resemble those of Urotrichus. 



The snout is covered with short dark hairs like those of the body. The 

 soles and palms are entirely scaly throughout. The tail is half as long 

 as the head and body, and is well clothed with hairs about T'"™ long. Its 

 scales, as well as those of the feet, are dark-brown. The hair of the 

 body is about 5™™ in length, of a dark-brown color, with strong green- 

 ish metallic luster in reflected light. 



Measurements of alcoholic specimens. 



Measurements. 



Length of bead and body 



Length of tail vertebrae 



Length of tail with hairs 



Extremity of snont to eye 



Extremity of snout to ear (anterior angle) 



Fore foot with claws 



Length of longest claw 



Hind foot with claws 



Length of longest claw 



Length of auricular opening 



15291. 

 Dymecodon 

 pilirostris i . 



lOOths. 



100.0 



53 



68.2 



22.7 



37.9 



16.6 



6.1 



22.7 



4.6 



6.1 



13713. 

 Urotrichus 

 talpoides ?. 



mm. 



80 



34 



42 



17 



28 



12 

 4 



17 

 2.5 

 5.5 



lOOths. 



100.0 



42.5 



52.5 



21.25 



35.0 



l.'J.O 



5.0 



2L25 



3.25 



6.9 



10717. 

 Neiirotrichua 

 Gibbsii 5 juv. 



m,m. 



53 



33 



38 



13 



21 



10 

 3.5 



14 

 3.5 

 3.0 



lOOths. 



100.0 



62.2 



7L7 



21.5 



39.6 



39.0 



6.6 



26.4 



6.6 



5.6 



In dentition Dymecodon most closely approaches NeiirotrieJins, but 

 has an additional premolar on each side of the upper jaw. The thick, 

 ■well-clothed tail resembles that of Urotrichus. 



The genus is described from a single alcoholic specimen. No. iffl^j 

 from Yenosima, at the mouth of the Bay of Yeddo, Japan. 



Washington, December 23, 1885. 



