THE WEST AMERICAN MOLLUSKS OF THE GENUS 



CINGULA. 



By Paul Bartsch, 



Assistant Curator, Division of Mollusks, United States National Museum. 



Of the genus Cingula we now know six species on the West Coast 

 of America, three of which are new. The first record was made by 

 Doctor Krause in a paper on the Molhiska of Bering Sea/ when he 

 described Cingula rohusta (Dall MS.) Ki-ause. The following year 

 Doctor Dall redescribed Cingula robusta and named the two extremes 

 of this form C. r. martyni and C. r. scipio, suggesting martyni for the 

 specific name, if the information he had received that rohusta was 

 preoccupied should prove true.^ In the same paper, page 307, he 

 described Onoba aleutica Dall, which I now refer to the present genus. 



Of the three species now added, two — C. alaslcana and C. liath- 

 erinse — come from Alaska, while the tliird — C. montereyensis — the 

 southernmost member of the genus, comes from Monterey, California, 



The four species described by Prof. C. B. Adams ^ as Cingula pau- 

 percula, Cingula (?) inconspicua, Cingula (?) terehellum, and Cin- 

 gula (?) turrifa, are all Pyramidellidre and were referred to their 

 proper places by Doctor Dall and the writer in Bulletin 68, United 

 States National Museum. 



CINGULA MARTYNI Dall. 



Plate 41, figure 5. 



Cingula rohusta martyni Dall, Proc. U. S. Nat. Mus., vol. 9, 1886, p. 306, pi. 3, 

 fig. 9.^Ci7igula robusta (Dall MS.) Krause, Arch. f. Naturg., 1885, p. 270, 

 pi. 17, fig. 1, a-b, not Cingula robusta H. C. Lea, Proc. Post. Soc. Nat. Hist., 

 1844, p. 204. 



Shell elongate-ovate, light chestnut brown. Nuclear whorls 

 scarcely differentiated from the succeeding turns, smooth. Post- 

 nuclear whorls weU rounded, smooth excepting fine, incremental lines. 

 Suture well constricted. Periphery and base of the last whorl 



1 Arch. f. Natnrg., vol. 51, 1885, p. 270, pi. 17, fig. 1. 



2 See synonymy of Cingula martyni. 



3 Ann. Lye. Nat. Hist. N. Y., 1852, pp. 405-6. 



Proceedings U. S. National Museum, Vol. 41— No. 1871. 



485 



