BALL: MOLLUSCA AND BKACHIOPODA. 269 



surface a rougli appearance; aperture short, anal sulcus shallow and feeble; 

 outer lip sharp, thin, simple ; body with the sculpture erased ; pillar smooth 

 short, obliquely attenuated, twisted ; canal wide, short, funicular, slightly recurved. 

 Lon. of (decollate) shell, 8.5; of last whorl, 6.0; of aperture, 4.0; max. diam. 

 4.5 mm. 



U. S. S. "Albatross," station 3392, Gulf of Panama, iu 1270 fathoms, hard 

 bottom, temperature 3G°.4 F. U. S. N. Mus. 123,122. 



Gemmula serilla Dall, n. sp. 



Plate 13, figure 6. 



Shell small, fusiform, sharply sculptured, white with an olivaceous periostra- 

 cum, with about four whorls exclusive of the decollate apex ; suture distinct not 

 appressed, whorl in front of it descending flatly to a nearly peripheral keel, the 

 flattened portion corresponding to the anal fasciole ; fasciole spirally sculptured by 

 four or five very fine, equidistant, simple, similar threads, crossed by (ou the last 

 whorl about twenty-five) elevated, sharp, arcuate, lamellar riblets, which are 

 continued over the whorl with wider interspaces to the anterior part of the base ; 

 the shoulder keel is minutely duplex, narrow, subspiuose where it crosses the 

 ribs, and more prominent than they ; in front of it are about twelve strong 

 rounded primary spiral threads, witii wider interspaces, eacli containing a finer 

 intercalary thread, the whole extending to the end of the canal ; aperture narrow, 

 anal sulcus wide, shallow; outer lip sharp, simple; body smooth, pillar straight, 

 obliquely attenuated in front ; canal narrow, straight, rather produced. Lon. of 

 (decollate) shell, 8.3 ; of last whorl, 6.0 ; of aperture, 4.5 ; max. diain. 4.0 mm. 



U. 8. S. " Albatross," station 3392, Gulf of Panama, in 1270 fathoms, hard 

 bottom, temperature 36°.4 P. U. S. N. Mus. 123,123. 



The shell described appears to be not quite adult. 



Leucosyrinx erosina Dall, n. sp. 



Plate 2, flj;ure 1. 



Shell fusiform, white, with an olive-gray more or less dehiscent dull periostra- 

 cum ; nucleus eroded, subsequent whorls about seven; spire without the nucleus 

 about equal iu length to tlie aperture ; suture appressed ; a little in front of it is 

 the anal fasciole, which is narrow, slightly constricted, and ill defined ; in front of 

 it and forming the shoulder of the whorl is a series of about twelve round-topped, 

 slightly protraetivc, wavelike axial ribs, which only reach the suture iu front of 

 them iu the earlier whorls, falling short of it in the later ones ; otlier axial sculp- 

 ture consists of rather irregular, more or less prominent incremental lines ; spiral 

 sculpture consists of tliree or more somewhat obscure incised lines over the 

 fasciole; ou the basal side of the whorl are numerous rather distant, distinct 

 spiral striae, subequal and nearly equidistant, the interspaces a little elevated 

 and, ou the canal, becoming threads; iu addition to these there are ou the 

 middle of the whorls a quantity of irregular, oblique, somewhat vermicular, short 



