346 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [May 20, 



Up spread on the pillar and continuous with the outer lip ; there is no 

 umbilicus or chink: tooth sunken, mostly observable in half-grown 

 specimens. L. 0*1. B. 0*0.5. 



' Porcupine ' Exp. 1869 : St. 4. 1870 : Atl. 9, 13, 26-34 ; Med. 

 40, 55, Adventure Bank. 



Distribution. Bay of Biscay ('Travailleur ' Exp. 1880 & 1881), 

 off the Tunisian coast (Nares), Messina ( Granata), off C. Verd. I. 

 (' Talisman ' Exp.) ; 30-1 1 92 fms. 



By comparing the above description of this species with those of 

 other species belonging to the present section which are given in the 

 fourth volume of ' British Conchology,' the difference will be easily 

 seen. Some conchologists, for whose opinion I have a great esteem, 

 believe that I have too much restricted the number of species ; but 

 I have conscientiously endeavoured to preserve the "juste milieu" 

 in that respect. 



t^ 4. Odostomia unidentata, Montagu. 



Turbo unidentatus, Mont. Test. Brit, (ii.) p. 324. 



O. unidentata, B. 0. iv. p. 134; v. p. 211, pi. Ixxiv. f. 1. 



'Lightning' Exp. St. 2, 4, 5 (var. elata). 



' Porcupine ' Exp. 1869 : St. 2. 1870 : Atl. 3«, 9, off C. Sagres, 

 Tangier B. ; Med. Benzert Road. 



Distribution. Iceland, Hammerfest and Vadso to the eastern coasts 

 of the Mediterranean, western coasts of Africa (' Talisman ' Exp.), 

 Canaries and Madeira, Pernambuco (' Challenger ' Exp.) ; 10-777 

 fms. 



Fossil. Pliocene : Red Crag, Calabria ; Post-tertiary : Norway, 

 Scotland, and Ireland ; 8-460 ft. Not 0. unidentata of Philippi 

 from the Tertiaries of N.W. Germany. 



Besides the synonyms given in ' British Conchology,' I would 

 observe that O. monterosatoi of the learned authors of the marine 

 mollusca of Roussillou appears to be the young of the present species, 

 judging from typical specimens kindly submitted by M. Dautzen- 

 berg to my examination. 



I 5. Odostomia turrita, Hanley. 



O. turrita, Hani, in Proc. Z. S. pt. xii. p. 18: B. C. iv. p. 135, 

 V. p. 211, pi. Ixxiv. f. 2. 



'Lightning' Exp. St. 4, 5. 



' Porcupine' Exp. 1870: Med. 55, Adventure Bank (var. nana). 



Distribution. Vadso and Lofoten I. to Hydra Channel in the Gulf 

 of Egina and the Adriatic, Madeira and Teneriffe (var. nana), Per- 

 nambuco (' Challeuger' Exp.) ; 0-350 fms. 



Fossil. Post-tertiary: Norway and Lochgilp {Crosskey and Robert- 

 son) ; 3-240 ft. 



O. turriculata of Monterosato seems to be another variety of this 

 species. 



Mr. Pidgeon observed this species at Torquay feeding on the 

 polyparies of a Lepralia. 



