DALL : MOLLUSCA AND BRACHIOPODA. 243 



Cylichnella (Cylichnium) pizarro Dall, n. sp. 



Plate 11, figure 1. 



Shell small, subcyliudiic, bkiit behind, with the spire immersed, showing ouly 

 a minute apical perforatiou; yellowish white with a thin, translucent polished peri- 

 ostracum ; inner lip with a thin wash of callus ; outer lip behind appressed toward 

 but not quite touching the apex of the last whorl, gyrate, laterally straight, the 

 lateral profile gently, couvexly arcuate ; margin thin, simple, slightly produced 

 and excavated in front, and passing with but a hardly perceptible angle into the 

 short straight pillar; over the latter is a wash of callus, but behind it no umbilical 

 chink ; sculpture of fine, close, spiral lines, microscopically punctate, and tending 

 to arrange themselves in pairs ; near the shoulder of the whorl are six or seven 

 much stronger subequal and nearly equidistant spirals, apparently not punctate ; 

 inner lip quite smooth and the pillar unarmed; axis not pervious. Lon., 9.75 ;' 

 max. lat., 5.0 mm. 



U. S. S. " Albatross," station 3392, off the Gulf of Panama in the Pacific, in 

 1270 fathoms, bottom temperature 36°. i F. U. S. N. Mus. 123,079. 



The form of this species is not unlike that of Cylichna crispula Watson, from 

 North Australia, but the latter is a very much smaller shell, has the outer lip 

 more produced behind the apex, and the aperture in front more contracted. 



Cylichnella (Cylichnium) atahualpa Dall, n. sp. 



Plato 11, figure 2. 



Shell small, elongate, white with a pale yellowish periostracum which shows 

 reddish brown in the incised sculpture ; the aperture as long as the shell, the 

 general form attenuated toward the extremities, especially in front, but moder- 

 ately convex near the middle of the whorl ; spire entirely concealed, the summit 

 forming a shallow funnel, owing to the gyration of the posterior margin, about 

 half of which is occupied by a deep rounded sulcus ; apex imperforate but with a 

 reflected edge of callus on the body, forming a chink at the bottom of the funnel ; 

 exterior polished, smooth except for faint lines of growth, but with a very few 

 fine incised punctate lines close to the anterior and posterior margins of the shell ; 

 body with a thin callus with a brown line at the outer edge ; outer lip thin, sharp ; 

 aperture narrow, deeply sulcate at each cud ; pillar simple, gyrate but not pervi- 

 ous, short and thick, with a little callus reflected upon it. Lon., 9; max. diam., 

 4 mm. 



U. S. S. "Albatross," station 3354. Gulf of Panama, in 322 fathoms, mud, 

 bottom temperature 46° P. U. S. N. Mus. 123,081. 



Bxdlariidae. 

 BULLARIA Rafixesquk. 



Bulla Linno, Syst. Nat, 1758, ed. 10. p. 725; 1767, c<l. 12, p. IISI ; not of Linntf. 

 op. cit., ed. 10, p. 427, nor of .MuUor, Prodr. Zool. Dan., 1770. p. 242. 



