228 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



Barleeia zeteki Strong & Hertlein, new species 

 Plate 21, Fig. 1 



Shell oval, light yellowish; nuclear whorls 2, well rounded, faintly 

 thimble pitted; postnuclear whorls 5, smooth, moderately rounded, 

 sutures distinct ; periphery of last whorl obscurely angulated ; base 

 moderately long ; aperture large, rather flaring, outer lip thin ; inner 

 lip curved, strong, the edge separated from the body whorl for its entire 

 length, and continued as a raised callus over the body to a junction 

 with the outer lip, rendering the peritreme complete. The type measures : 

 length, 2.2 mm; diameter, 1.3 mm. 



Holotype: No. 707 (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. One hundred sixty additional speci- 

 mens were dredged at the same locality and 150 off Taboga Island, 

 Panama. 



None of these specimens were living and all are probably more or 

 less bleached. The various species in the genus can only be separated 

 by slight differences in size, shape, and color. The present species differs 

 from Barleeia polychroma De Folin,^^ the only species to be reported 

 from Panama, in the more elongated shape, less rounded whorls, and 

 angulated periphery. It resembles Barleeia dalli Bartsch,^^ dredged off 

 San Diego, California, in shape but is much smaller and lacks the spiral 

 thread on the angulated periphery. 



This species is named for Dr. James Zetek, of the Institute for 

 Research in Tropical America, at Barro Colorado Island Biological 

 Laboratoiy, in the Panama Canal Zone. 



Amphithalamus trosti Strong & Hertlein, new species 



Plate 21, Fig. 2 



Shell minute, ovate, brownish, with nuclear whorls lighter; nuclear 

 whorls nearly 2, well rounded, marked with fine spiral striations and 

 equally fine, retractive axial threads; postnuclear whorls 2^, moderately 

 rounded, narrowly shouldered at the summit, smooth except for retrac- 

 tive lines of growth, sutures distinct ; periphery of the last whorl marked 



^^ Rissoa polychroma De Folin, Fonds de la Mer, vol. 1, 1870, p. 133, pi. 20, 

 fig. 3. Panama Bay. 



54 Barleeia dalli Bartsch, Proc. U. S. Nat. Mus., vol. 58, November 9, 1920, 

 p. 168, pi. 13, fig. 10. Dredged "in 71 to 75 fathoms on sand and mud bottom, off 

 Point Loma, California." 



