634 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Genus Scajpanus, Pomel, 1848. 



2. Soap ANUS townsendi (Bacli.). 



Scalojys toivnsendii, S. latimanus, Bach. — S. canadensis. Rich, (nee auct.). — SS, 

 ■ metallescens, wneus, Cass. * — S. tceniata, Le C.t — S. californica, Ayres.t 



3. SCAPANUS BREWEEI (Bach.). 



(" Talpa europcea ex America ", Aliq.) 



Genus Cotidylura, 111., 1811. 



4. CONDYLURA CRISTATA (L.). 



iSorex cristatiis, L. — Talpa longicaudata, Ersl. — T. radiata, Shaw. — T. longicawda, 

 Bodcl. — CmacrourayHaA. — C.prasinata, Harris.^ 



Genus Urotrichns, Temm., 1842. . • 



5. Urotrichus gibbsi Bd. 



{f=U. tal2yoideS) Temm.) 



§ 3.— GENEEAL EEMARKS ON THE SOEICIBJE. 



Study of our Shrews will not give results with requisite precision, no 

 matter how great the accessions of material, until we know more than 

 we have yet learned of the limits of geographical and individual varia- 

 tion to which the same species may be subject. I am not aware that a 

 single one of our species has yet become fully known in these respect?, 

 and we are still obliged to rely somewhat upon analogies which the 

 cases of better known European species may afford. In treating of 

 Blarma taJpoides from this point of view, Mr. J. A. Allen {Joe. supra cit.) 

 certainly overreached the mark ; yet enough has been ascertained to 

 render it certain that he was right in insisting that a much wider range 

 of geographical and individual variation exists than is admitted, infer- 



* 1853. — Cassin (J.). — [Exhibition of a new mole, Scalops metallescens (descr. nulla).] 

 < Proc. Acad. Nat. Sci. Phila., vi, Feb., 1853, p. 242. 



[Described, ibid., p. 299, as S. oeneus.'] 



1853. — Cassin (J.). — Description of a new mole of the genus. Scalops, from Oregon ; 

 a specimen of which is in the collection of the Exploring Expedition made by the 

 U. S. ships Viucennes and Peacoch, under the command of Captain Charles Wilkes, 

 of the United States Navy. < Proc. Acad. Nat. Sci. Phila., vi, 1853, p. 299. 



[/S. ameus — named, not described, ibid., p. 242.] 



Mr. Cassin, whether intentionally or inadvertently, applied these two names to the 

 same specimen. 



tl853.^Le Conte (J.). — [Remarks "on the species of Scalops in the Collection of the 

 Philadelphia Academy.] < Proc. Acad. Nat. Sci. Phila., vi, June, 1853, pp. 3:2-6, 327 

 (name on p. 327). 



t IbSS.-^Ayres (W. 0.\ — " Ou Scalops californicus." <Proc. Cala. Acad. Sci. i, May, 

 1855, p. 54. 



§1825. — Harris (T. W.). — "Description of a nondescript species of the genus Con- 

 dylura." <Boston Journ. Philos. and Arts, ii, 1825, pp. 580, 583. (Also, Tilloch's Philos. 

 Mag., Ixvii, 1826, pp. 191-193.) 



