MOLLUSCA OF THE ' CHAXLENGER ' EXPEDITION. 339 



St. 122. Sept. 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off 

 Pernambuco. 350 fms. Mud. 



Var. suBACTA. St. 23. Marcli 15, 1873. Lat. 18° 21' N., 

 long. 63° 28' W. Sombrero Island, St. Thomas, Danisli West 

 Indies. 450 fms. Glohigerina-ooze. 



St. 24. As above. 



Shell. — Eather small, short, and dumpy, with a high blunt 

 spire, a small last whorl, a very contracted base, from which 

 projects a small, slightly reverted snout ; the whorls are lon- 

 gitudinally chamfred and have a small beaded thread round the 

 top. Sculpture. Longitudinals — there are on each whorl about 

 13, straight, narrow, ridge-like, but low riblets, separated by 

 shallow furrows of two to three times their breadtli ; these ribs 

 and furrows run pretty continuously down the spire, with a slight 

 sinistral twist ; toward the mouth and on the base they become 

 feeble, but are faintly traceable on the snout. The whole surface 

 is finely scored with lines of growth. Spirals — the suture is iu- 

 feriorly margined by a slight thread, which rises into small beads 

 in crossing the riblets ; in the longitudinal furrows a faint tendency 

 to spiral scratches is visible, which on the base arrange themselves 

 into narrow and very superficial furrows with broadish flat thi^eads 

 between ; these become strongish and narrower on the base of 

 the snout, but feebler again towards its front. Colour glossy 

 porcellaneous white. Spire rather high, narrow and conical. 

 Apex a small round dome of two glossy embryonic whorls, of 

 which the extreme tip is both immersed and flattened down with 

 scarcely any suture. Wlwrls 8 in all, conical, with straight 

 sides, short and broad ; at the top each projects very shortly and 

 horizontally ; the last is small, with a rapidly contracted base, 

 from which projects the small slightly reverted snout. Suture 

 a very little impressed, but strongly marked by the projection of 

 the whorl below it. Moidli small, rather rhomboidal, pointed 

 above, and produced below into a short open squarish canal. Outer 

 lip very straight to the corner of the base, from which it is patu- 

 lous and curved ; in the middle one small round tubercle projects ; 

 a little way below the suture the edge is drawn back, so as to 

 form a very slight open false sinus. Inner lip : there is a thin 

 glaze on the body, the line across which is very straight, as is 

 also the line down the pillar, where the glaze (without teeth) 

 forms a thickish prominent border ; this border is early cut off" on 



LINy. JOUEIf. — ZOOLOGY, VOL. XVI. 24 



