216 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



Gerithiopsis eiseni Strong & Hertlein, new species 



Plate 20, Fig. 6 



Shell minute, elongate-ovate, brown; nuclear whorls decollated; 

 postnuclear whorls 6, the early whorls rapidly enlarging, the last con- 

 tracted toward the base, sutures impressed ; spiral sculpture consisting 

 of 3 tuberculate cords, of which one is at the summit, one immediately 

 above the suture, and the third half way between the other two, the 

 spaces between them being a little wider than the cords ; axial sculpture 

 of equally strong, nearly vertical ribs connecting the tubercles and 

 extending into the sutures: of these ribs 16 appear on the second, 18 

 on the third and fourth, and 20 on the penultimate whorl; the tubercles 

 at the junction of the axial cords and spiral ribs are well rounded and 

 the spaces inclosed by them form well impressed, rounded pits ; periphery 

 of the last whorl marked by a sulcus about as wide as the spaces be- 

 tween the spiral cords, and like them crossed by the ends of the axial 

 ribs; base well rounded, marked by 3 spiral cords, separated by rounded 

 grooves, the upper of these cords bounds the peripheral sulcus and is 

 slightly nodulous, while the lower is a slender thread encircling the 

 columella; aperture oval, strongly channeled anteriorly, the outer lip 

 broken in the type; columella curved, stout, the body with a thick 

 callus. The type measures: length, 1.8 mm; diameter, 0.8 mm. 



Holotype: No. 710 (Calif. Acad. Sci. Paleo. Type Coll.), from 

 Loc. 27,229 (C.A.S.), dredged in from 3 to 9 fms. in Bahia Honda, 

 Panama. L. G. Hertlein collector. Twenty-seven additional specimens 

 were dredged at the same locality and 3 specimens off Taboga Island, 

 Panama. 



In the key to the west coast species in the genus Gerithiopsis j*^'^ this 

 species would follow piipiformis which was described from Mazatlan, 

 Mexico. It differs from that species principally in the more ovate form 

 and in the smaller, wider spaced tubercles. 



This species is named for Dr. Gustav Eisen, member of the Cali- 

 fornia Academy of Sciences. 



Gerithiopsis gissleri Strong & Hertlein, new species 



Plate 20, Fig. 7 



Shell minute, brown, nuclear whorls white, 4 smooth, well rounded, 

 forming a conical spire; postnuclear whorls 6, the early whorls rapidly 



44Bartsch, P., Proc. U. S. Nat. Mus., vol. 40, May 8, 1911, pp. 330, 331. 



