182 TURRITELLID^. 



Dentalium jlabnim, Mont. Test. Brit. vol. ii. p. 411?. — JMaton' ;iih1 Rack. Trans. 

 Linn. Soc. vol. viii, p. 239. — Tukt. Conch. Diction, p. 40. 

 — Brit. Marine Conch, p. 4, fig. 5. 

 Ccecum glabrum, Fleming, Edinb. Encyclop. pi. 204, f. 7, and pi. 20."), f. f], 9. 

 Ortliocera glabra^ Fleming, Brit. Animals, p. 237. 

 Odontidium Icevissimum, Cantraine, Bull. Brux. vol. ix. pt. 2 (1842), 



p. 340. 9 

 Brochus glabrtts, Bkown, Illust. Conch. G. B. p. 12.'), pi. 56, f. 3. 



„ IcBvis, Brown, Illust. Conch. G. B. p. 125, pi. 5(3, f. G (probably). 



This minute shell, which only measures a line in length, 

 is very thin, semitran.sparent, glossy, snow white, and 

 almost smooth. When aged it is nearly straight, but when 

 simply adult, it is moderately arcuated, cylindraceous, 

 and of nearly equal diameter throughout, merely tapering 

 slightly at its imperforated or posterior termination, which 

 is fiirnished with a moderately projecting rounded knob. 

 The length in general is about five times the breadth. The 

 aperture is neither contracted nor dilated, but simple and 

 suborbicular. The dorsal or arcuated side of the shell is 

 clearly the longer. 



According to Mr. Clark, the fry is coiled into a spiral at 

 the narrower extremity, in which state it is figured by 

 Walker in his " Testacea minuta" (f. 11, from which 

 Seiyula incurvata, Adams, Micros, pi. 14, f. 7 ; Maton 

 and Rack. Trans. Linn. Soc. vol. viii. p. 24G ; Tukt. 

 Conch. Diet. p. 156; Dillw. Recent Shells, vol ii. p. 

 1071 ; Vermiculu7)i incurvatum, Mont. Test. Brit. p. 518 ; 

 Cornuoides major, Brown, Illust. Conch. G. B, p. 125, pi. 

 56, f. 49). 



The figure of the BrocJtus arcuatus of Brown (111. Conch. 

 G. B., p. 125, pi. 56, f. 9) reminds one of a curved and 

 elongated form of this species. It is stated to have 

 measured the eighth of an inch, and to have been taken 

 from the sand of Bantry Bay. What, however, we had 



