1881.] THE SURVEY OF H. M.S. 'alert.' 27 



beaded one just beneath the suture. The last whorl has two pro- 

 minent simple keels round the middle, and indications of one or two 

 below. The canal is short, and the columella tortuous. The colour 

 is probably faded. In its present condition the shell is white, with 

 the exception of the keel at the suture, which has traces of a pale 

 lurid hue. It is 10 millims.fin length ; bnt it is questionable if that is 

 the ultimate dimension to which it would attain. 



Pleurotoma (Bela) cunninghami, sp. n. (Plate IV. fig. 1.) 



Shell ovately fusiform, turreted, purple brown with pale costse. 

 Whorls 6-7 ; the two apical rather large, smooth, rounded ; the 

 rest concavely sloping above, curved slightly at the sides, and con- 

 tracted at the base, strongly plicate and minutely spirally striated. 

 Plicae or costae about twelve in number, nearly obsolete at'the upper 

 part and not reaching the suture ; those on the last whorl attenuate 

 inferiorly and disappear at a shallow furrow around the base ; beneath 

 the sulcus is an oblique raised ridge. Aperture oblong, dark purplish 

 brown, occupying about two fifths of the entire length. Columella 

 suberect, rounded, whitish, callous. Sinus distinct, but not deep, 

 situate on the concavity at the top of the labrum. The latter is 

 minutely crenate by the exterior fine striae. The basal canal is short, 

 wide, and pale at the extreme margin. Length 10 millims., diam. 4, 

 aperture 4 long, 1| wide. 



Operculum elongate pyriform ; nucleus terminal. 



Hab. Puerto Bueno, 2 to 7 fathoms, rocky bottom, and Station 2. 



Some worn specimens of this species were obtained by Dr. Cunning- 

 ham during the voyage of H.M.S. 'Nassau ;' and it is with his name 

 that I feel much pleasure in associating this interesting form. Those 

 collected by Dr. Coppinger are in good condition, and exhibit a well 

 defined superior sinus, which is decidedly deeper than in the boreal 

 types of the Bela group of Pleurotoma. 



Pleurotoma (Mangelia?) coppingeri, sp, n. (Plate IV. 

 fig. 2.) 



Shell small, elongate, subfusiform, dark purplish brown, paler at 

 the apex. Whorls 6|, divided by a deep suture ; the first one and 

 a half forming the nucleus, large, semiglobose, smooth ; the rest 

 slightly convex and longitudinally ribbed. Costae stout, broader 

 than the interstices, suberect, a little arcuated ; those on the body 

 whorl become obsolete a trifle below the middle, whence downward 

 the whorl is transversely finely striated, the striae at the extremity 

 being closer together than those above. Aperture small, ovate, 

 occupying about one third of the entire length. Columella arcuate, 

 covered with a thin callosity. Labrum thickened, with a very faint 

 sinus a little below the suture. Basal channel short, distinct, ob- 

 lique. Length 6^ millims., diam. 2^. 



Hab. Wolsey anchorage, 17 fathoms, mud and gravel bottom. 



Only a single specimen was obtained, which hardly presents the 

 character of the sinus in the labrum satisfactorily. 



