48 BULLETIN OF THE 



fourth of the whorl is closely wound and very strongly appressed, giving the 

 posterior edge of the last whorl especially a bevelled appearance ; spiral sculp- 

 ture, extremely fine grooves, not puncticulate, strong on the posterior aspect, 

 obsolete on the body (which appears polished), and, except in the young, on 

 the anterior extreme ; the sutural wrinkles are prettily shagreened by the in- 

 tersection of these fine close grooves ; spire very obliquely wound, the margin 

 of the volutions rounded (notwithstanding its being closely appressed), and 

 the rounded edge often eroded showing the inner porcellanous under the outer 

 more cretaceous layer, the extreme apex eroded in all the specimens obtained ; 

 aperture very wide in front, extremely narrow behind ; the margin retreating 

 from the columella to half-way between axis and exterior, almost straight in 

 front, then rising and continuing backward nearly parallel to the axis, and fall- 

 ing away again obliquely to the suture, forming an extremely narrow and deep 

 notch ; body with a thin deposit of white, callus, columella hardly thickened, 

 spiral, passing without noticeable interruption into the anterior margin ; outer 

 lip sharp, thin. Lon. of shell, 9.0 ; of aperture, 7.5 ; max. lat. of shell, 5.25 ; 

 of aperture, 3.37 mm. 



Station 236, off Bequia, in 1591 fms., ooze, bottom temperature, 39°.0 ; Sta- 

 tion 162, off Guadelupe, in 734 fms., ooze, bottom temperature 40°.0 F. 



This shell has a distant resemblance to an Acteeon, which it is not, as is evi- 

 dent on inspection. It may prove a Cylichna when the soft parts are known, 

 reference until then being necessarily provisional. It is peculiarly bevelled 

 off behind and abrupt in front, and is stouter than most shells of this group. 

 It is posssble that in the young at some stage the nucleus may be entirely en- 

 rolled. It is quite distinct from anything recent or fossil which I find figured. 

 It is most nearly allied to U. ? vortex Dall, which is a smaller, proportionally 

 more slender, cylindrical shell, with somewhat different sculpture and a blunter 

 spire. In the figure of U. ? domitus the wrinkles on the spire are not suffi- 

 ciently emphasized as compared with the lines of growth, nor is the difference 

 in sculpture between the body and the posterior aspect as sharply defined as it 

 appears under a good lens. This species differs from Utriculus spatha Watson 

 in form and in the absence of folds on the columella. It differs from U. olivi- 

 formis Watson in the proportion of the spire to the whole length, in the un- 

 equal distribution and different character of the sculpture. But I doubt if 

 these species do not vary greatly, and the discovery of intermediate links be- 

 tween them and U. vortex would not surprise me in the least. 



Utriculus pervius Dall. 



Shell short, stout, truncate apically, white, polished, sculptured only with 

 faint incremental lines ; form subcylindrical, larger anteriorly, a little com- 

 pressed just behind the middle; aperture long, narrow behind and rounded 

 at the posterior commissure, where it has a shallow rounded notch, the outer 

 boundary of whose path is marked on the summit by a raised line ; anterior 

 part of aperture wider, not very oblique, rounded in front ; outer lip straight, 

 January 6, 1889. 



