MUSEUM OF COMPARATIVE ZOOLOGY. 47 



long, rather wide and straight, the posterior commissure rounded, the anterior 

 wide, the margin spirally curved showing the axis (though this is not per- 

 vious) ; umbilical chink none, i)illar hroad, white, oblique without any trace 

 of a i)lication ; outer lip thin, arched forward in the middle; suture very deep*, 

 inner lip with a wash of callus. Lon. of shell, 8.3; of aperture, 7.0 ; max. 

 lat. 4.6 mm. 



Habitat. Fish stomach, at Portland, Maine, from which it was collected 

 by Mr. Mayo and sent to Dr. Jeffreys. This shell recalls Bulla turrita Moller 

 (Adams, Thesaurus Conch., pi. cxxi. fig. 28, but is much larger, with propor- 

 tionately shorter spire, straighter sides, and more width anteriorly). 



Utriculus ? Frielei Dall. 



Plate XVII. flgr. 4. 

 Utriculus 1 Frielei Dall, Bulletin M. C. Z., IX. p. 101, 1881. 



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



Utriculus leucus Watson seems to approach this species as nearly as any 

 known form, but has sundry distinctive characters. There is no doubt, how- 

 ever, that there are differences of form and development of the tip of the spire, 

 in these enrolled forms, in adult individuals, as well as during the stages of 

 one individual. It will not do, therefore, to draw the specific lines too taut on 

 this sort of character. 



Utriculus? vortex Dall. 



Plate XVII. fig. 3. 



Utriculus 1 vortex Dall, Bulletin M. C. Z., IX. p. 100, 1881. 



Cylichna Dalli Verrill, Trans. Conn. Acad., V. p. 542, 1882 ; VI. p. 274, pi. xxix. 

 fig. 15, 1884. 



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



This species differs remarkably from the form about to be described. With 

 the material I have to study, I am obliged to separate them. But in the few 

 specimens I have seen there is a good deal of variability indicated. 



Cylichna Dalli, I am sorry to say, agrees perfectly with U. ? vortex and I feel 

 there are no grounds upon w^hich I could attempt a rescue of its specific valid- 

 ity. I have compared authentic specimens. 



Utriculus (vortex var.?) domitus n. 8. 



Plate XVn. Fig. 8. 



Shell solid, yellowish white, short, broad and squarely truncate in front 

 with a rather blunt mammiform spire exhibiting about three turns ; surface 

 transversely marked with faint lines of growth, and near the suture with fine 

 well-marked wrinkles as if too large for the spire around which the posterior 



