BULLA. 337 



forated or false-umbilicate above, rimate beneath ; smooth, shining, 

 showing when strongly magnified, numerous very weak growth- 

 strise ; toward the base there are some well-marked, spaced spiral 

 strise. Aperture kidney-shaped, as long as the shell ; columella 

 thick, arcuate, a little reflexed ; lip acute and arcuate ; color sub- 

 hyaline white. (Dflwfo.). 



Pico, Azores, 1287 meters, 



Bulla guernei DAUTZ., Res. Camp. Sci. Albert I, fasc. i, Contr 

 Fauna Malac. des lies Ayores, p. 24, pi. 1, f. 5ad., 1889. 



B. SEMIL.EVIS (Jeffr.) Seguenza. 



I have not access to the work containing a description and figure 

 of this species. 



Bay of Biscay (Jeffr.) ; Wed of Azores, 1000 fms. ; off Fayal y 

 Azores 450 fms., and off San Miguel, Azores, 1000 fms. (Chall.) ; 

 Middle Pliocene of Calabria (Seguenza). 



Bulla semilcevis JEFFREYS, Rep. Brit. Asso. Adv. Sci. 1880, p. 

 10, name only. SEGUENZA, Form. Terz. Calabria, in Mem. Acad. 

 di Lincei, Ser. 3, vi, p. 251, pi. xvi, f. 5. WATSON, Challenger 

 Gastr., p. 638. 



BULLA SUBROTITNDA Jeffreys (Rep. Brit. Asso. Adv. Sci. 1873, p. 

 113, name only. Monts., Bull. Soc. Mai. Ital. vi, p. 77). Off Jij- 

 eli, Algerian coast of Mediterranean ; also Atlantic, and fossil at 

 Ficarazzi. 



B. KREBSII Dall. Unfigured. 



Shell nearly the form of B. occidentalis A. Adams, but more 

 cylindrical and of an ivory porcellanous white. The posterior angle 

 of the aperture is more sharp and the aperture near it narrower, 

 while on the columella there is a faint revolving ridge which sug- 

 gests a plait, though too obscure to be so named. The surface is 

 brilliantly polished, with perceptible incremental lines. Callus on 

 the body thin, with a very minute chink behind that on the pillar. 

 Apex deeply sunken, pervious, scalate, showing nearly four volu- 

 tions, the margin of the vertex rounded, with faint indications of a 

 carinal line. Max. Ion. 8'0 ; max. lat. 5*0 mill. (Dall). 



Near Guadeloupe, in 769 fms., East from Tobago, 880 fms. 



Bulla krebsii DALL, Blake Gastr., p. 56; Proc. U. S. Nat. Mus. 

 xii, 1889, p. 298. 



