MUSEUM OF COMPARATIVE ZOOLOGY. 101 



acute point behind, shorter than the shell ; pillar with no twist or fold, contin- 

 uous Avith the margin. Lon. of shell, T.o ; of aperture, 6.0. Max. lat. of shell, 

 4.25 ; of aperture, 2.5 mm. 



Station 43, 339 fms ; Station 44, 539 fms. 



After comparing this with the figures of all the Northern species given by 

 Sars and those from the West Indies by D'Orbigny, it seems fi[uite distinct 

 from any of them. It is possible tliat it may prove to be a Cylichna when the 

 animal is known ; but it does not agree with any of the figured Cijlichnce. 



Utriculus (?) Prielei n. s. 



Shell rather large, solid, polished opaque white, broader behind than before 

 its middle ; apex perforate, around which the margin of about two turns is 

 usually visible ; this margin, formed by the rather broad p- shaped posterior 

 sinus of the aperture, resembles the notch-band of some Pletirotomidce in that 

 the surface is flattened, with a well-marked boundary on each side, and on this 

 surface the successive mai-giual edges are often raised into scales, one fitting 

 into another, composed of an extension of the body callus on one side and a 

 reflection of the free margin on the other ; the surface of the band varies in 

 different specimens from nearly smooth to distinctly and regularly undulated 

 or imbricately scaled as above mentioned ; other transverse sculpture of lines 

 of growth which are hardly visible while of spiral sculpture there is none, 

 though, with a strong reflected light, under the microscope numerous spiral 

 markings may be observed which are neither grooved nor raised, but are vis- 

 ible in most smooth spiral shells, and are probably due to growth, somewhat 

 as are the lines commonly recognized as " lines of growth." Aperture nearly 

 or quite as long as the shell, narrow, rounded in front, and terminating in the 

 tD - shaped sinus behind ; outer lip straight, sharp, thin, not incurved, rounded 

 to join the stout columella into which it passes imperceptibly ; pillar broad, 

 short, with a thin callus which also extends along the body ; shell widest about 

 the jiosterior third ; distinctly narrowed anteriorly. Lon. of shell and aper- 

 ture (the latter occasionally ^a trifle less), 8.2. Max. lat. of shell (at posterior 

 third), 4.0 ; at anterior third, 3.5 ; of aperture, 1.75 ; min. lat. of aperture, 

 0.5 mm. 



Off Cape San Antonio, 640 fms,; Yucatan Strait, 640 fms. 



None of the Northern species present the characters of U. (?) Frielei. U. trun- 

 catulus Brug., as figured by Sars (Tab. 18), should have a somewhat similar 

 summit, though the lines are not t) - shaped, but obliquely transverse in the 

 figure ; the other characters of that shell are quite different, and it does not 

 reach half the size of U. (?) Frielei. None of those figured by D'Orbigny are at 

 all like the present species, which it gives me pleasure to dedicate to Mr. 

 Hermann Friele of Bergen, naturalist (in charge of the Mollusca) of the Nor- 

 wegian Deep-sea Expedition on the Voringen, and well known for his work 

 on the collections of that expedition and for his valuable researches on the 

 development of JJ^aldheimia. 



