48 



REVISIOX OF AMEBIC AX MOLES— TRIE. 



The second and third upper incisors in Scapanus^ though small, aie not 

 minute as in Scalojys. 



Tlie nostrils are commonly stated to be "supero-laterar' in Scapanus 

 and superior in Sadops, but I am unable to discern any ditterence in 

 their position in tlie two genera: they are superior in both. 



Since establishing the genus ;S('(q)anus, by Pomel, in IS-iS, both Town- 

 send's mole and Brewer's mole have been constantly included in it. 

 The latter species presents very distinct osteological characters, how- 

 ever, and I have separated it under the name o^ Parascalops. 



Pomel introduces the genus Scapanus in the following manner:' 



"2^' type [des Talpiens], Leptokhiniens, trompe grMe aigue, uaiines ouvertes 

 pros fie rextrornitc." 



Geures Hyporysmii?,- Scalopn, Scapanus. 



NOTA. — Ce troisii'iue genre dirt'tTe des scalops ]>ar la position latorale et non supo- 

 rieure de rouvertnre des nariiies, et par la formule deutaire compreuant line iutiT- 

 niodiaire snporieure ot trois inlerieures de plus. Les espi'Ces sont: Svcqxiiuis Ton- 

 sendii [sic] et Breweri (Seal. Toivsendii [sic] et Breweri Bacbm.). 



EXTERNAL CHARACTERS OF THE GENUS. 



Body fusiform, depressed. Head conical. Snout, nostrils, and lii)s as 

 in Scalops aquaticKs. Eye minute, concealed in the fur but not covered 

 by membrane. Auricular orifice concealed by the fur, circular, about 

 1.5 mm. in diameter. 



Fore feet very large, as in Scalops. Palms (with toes) shorter than 

 soles, subcircular, or about as long as broad; naked and pseudo-tuber- 

 cular below; sparsely 

 hairy above, with a 

 conspicuous f r i n g e. 

 Toes scarcely webbed. 

 Claws very large and 

 ^^ r ^ ^ broad, as in Scalojjs 



' aqiiaficus. 



Hind feet long and 

 narrow. UpjH'r sur- 

 face covered with rather 

 sparse long hairs, the 

 outer of wliicli form a 

 fringe around the sides 

 of the soles, which fringe is especially long on the outer side of the 

 heel. Under surface naked, with one pronnnent tubercle near the 

 middle. Toes scarcely webbed. Claws very long, compressed, curved, 

 acute. 

 Tail thick, terete, tapering toward the extremity, and usually con- 



12. IJ 



SNOUT OF SCAPANUS ToWNSENDI 

 Kig. 12, Upper surface. Kig. 13, 1,.iw,m .surfa 

 ( 1 ^y times u:itural size. ) 





I Archiv. Sci. Phys. &, Nat., IX, 1848, p. 247. 



- The mark of interrogation is Pomel's. Ilyporys^us is a fossil genus Jrom the Ter- 

 tiary of Auvergue, France. 



