NO. 12 STRONG AND HERTLEIN : MARINE MOLLUSKS 217 



increasing in size, the last 3 cylindrical, sutures impressed; spiral sculp- 

 ture consisting of 3 tuberculate cords of which one is at the summit, 

 one a little above the suture, and a median cord which is nearer the 

 one at the summit than the suprasutural one on the early whorls but 

 about half way between them on the later whorls; axial sculpture of 

 equally strong, nearly vertical ribs which connect the tubercles and 

 extend into the suture: of these ribs 16 appear on the second, 18 on 

 the third and fourth, 20 on the fifth, and 22 on the penultimate whorl ; 

 the tubercles at the junction of the axial ribs and spiral cords are 

 rounded anteriorly and truncated posteriorly; the spaces enclosed be- 

 tween the axial ribs and the upper and median spiral cords form spirally 

 elongated pits and those between the median and suprasutural cords 

 form squarish pits; periphery of the last whorl marked by a sulcus 

 about as wide as that between the median and suprasutural spiral 

 cord and like it is crossed by the ends of the axial ribs ; base rather long, 

 marked by 2 strong, rounded spiral cords, of which one bounds the 

 peripheral sulcus and the other is near the middle; in addition to these 

 there is a very slender, raised thread encircling the columella; aperture 

 oval, strongly channeled anteriorly, the edge of the outer lip broken 

 in the type; columella strong, twisted, the body with a strong callus. 

 The type measures: length, 3.0 mm; diameter, 0.9 mm. 



Holotype: No. 711 (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. Seventy additional specimens were 

 dredged at the same locality. 



In Bartsch's key to the west coast species in the genus Cerithiopsis,'^^ 

 this would follow abreojosensis which was described from Lower Cali- 

 fornia. It differs principally in the posterior truncation of the tubercles. 



This species is named for Captain August Gissler, who resided on 

 Cocos Island for several years and sought for the treasure reported to 

 have been hidden on the island by pirates. 



Gerithiopsis montezumal Strong & Hertlein, new species 



Plate 20, Fig. 8 



Shell dark brown with the nuclear whorls white, regularly elongate- 

 conic; nuclear whorls 4, well rounded, smooth, forming a conical spire; 

 postnuclear whorls 7, sutures impressed; spiral sculpture consisting of 



45Proc. U. S. Nat. Mus., vol. 40, May 8, 1911, pp. 330, 331. 



