< YI,I< UNA. 295 



often eroded showing tin- inn.-r porc.-lhuioiH iind-r tlie outer more 

 cretaceous layer, the extreme apex eroded in all tin- yp- -mien* ob- 

 tained ; aperture very wide in front, extremely narrow In-hind ; the 

 margin retreating from the columella to half way brtwr.-n axi- and 

 exterior, almost Straight in front, then rising and continuing hack- 

 ward nearly parallel to the axis, and falling away again obliquely 

 to the suture, forming an extremely narrow and deep notch ; ho.lv 

 with a thin deposit of white callus, columella hardly thickened, 

 spiral, passing without noticeahle interruption into the anterior 

 margin ; outer lip sharp, thin. 



Lon. of shell 9'0 ; of aperture 7'5 ; max. Lit. of shell 5'25 ; of 

 aperture 3'37 mm. 



OffBequia, 1591 fms. ; off Gudelj , 7 4 frns. 



Hr/cu/it* (varies var. /) domitus DALL, Blake Gastr.. p. 47, pi. 

 17, f. 8. 



This shell has a distant resemblance to an Artnton which it is 

 not, as is evident on inspection. It may prove a Oylichna when the 

 soft parts are known, reference until then being necessarily provis- 

 ional. It is peculiarly bevelled off behind and abrupt in front, 

 and is stouter than most shells of this group. It is possible that in 

 the young at some stage the nucleus may be entirely enrolled. It 

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

 It is most nearly allied to U. f vorte.v Dall, which is a smaller, pro- 

 portionally more slender, cylindrical shell, with somewhat different 

 sculpture and a blunter spire. In the figure of U. f domitus the 

 wrinkles on the spire are not sufficiently emphasized as compared 

 with the lines of growth, nor is the difference in sculpture her. 

 the body and the posterior aspect as sharply defined as it ap: 

 under a good lens. This species differs from Utrlrnlu.* *jniflni Wat- 

 son in form and in the absence of folds on the columella. It differs 

 from U. oliviformis Watson in the proportion of the spire t<- 

 whole length, in the unequal distribution and different chara< ; 

 the sculpture. But I doubt if these species do not vary greatly, 

 and the discovery of intermediate link- between them and I'. > 

 would not surprise me in the least. /' 



C. VOKTIIX Dall. 1M. 21, fiir. 7. 



Shell stout, rather >olid. opaque white, short, the po-terior fourth 

 bevelled off' toward the bluntly rounded summit : tra: ul|t- 



ure consistini: f occasional faint line- of irrowth. m>\\ : 



