GASTEROPODA. 109 
TruncaTenta Virtana (Gould). 
Testa decollata, conico-cylindracea, solidula, flavido-cinerea ; spira an- 
fractibus superstitibus quatuor vel quinque planiusculis, costulis sub- 
rectis, elevatis, obtusis ad triginta clathratis: apertura obliqua, rotun- 
dato-elliptica ; peristomate expanso, continuo, anfractui penultimo 
haud adnato, costa marginato que posticé ad suturam producta est : 
operculum laminatum. 
Truncatella Vitiana, Goutv; Proceed. Boston Soc. Nat. Hist., ii. 
208. March 1847. Expedition Shells, 40. 
Suet rather large and solid, decollated, cylindrico-conical, of a 
pale yellowish, or dirty ash-colour. Whorls remaining after trunca- 
tion about four or five, slightly convex, barred with about thirty 
nearly straight, elevated, obtuse ribs, some of which, on the last whorl, 
are lost before attaining the base. The aperture is obliquely rounded, 
elliptical, entire; the lip trumpet-shaped, rather widely distant from 
the penultimate whorl on the pillar side, margined by a rib which, on 
the outer side, is continuous not only with the left lip behind, but also 
passes on till it reaches the regular course of the suture, so that, when 
viewed at the right side of the aperture, it does not seem disjoined from 
the preceding whorl; umbilical region slightly angulated. 
Length three-tenths of an inch ; diameter one-tenth of an inch. 
Inhabits the Feejee Islands, where it is very abundant. 
One of the largest species, distinguished especially by the peculiar 
manner in which the outer lip forms its junction posteriorly ; the ribs 
also become fused posteriorly, so that the intervening flutings do not 
always reach the suture. 
It varies much in size, but not in sculpture. It is not very different 
from T. valida, Pfeiffer, but it can scarcely be said to be carinate at 
base, and is in no degree umbilicated. 
Figure 126, front view of the shell, enlarged ; 126 a, last whorl, en- 
larged; 126 0, natural size. 
28 
