352 Description of some nondescript and rare Shells. 



within ; the outer lip much spread, with the margin sharp and slightly 

 reflected ; pillar smooth. 



This fine shell was taken by the dredge, off Scarborough ; 

 and is in the cabinet of Mr. Bean, who obligingly sent it to 

 us for examination and description. 



Triton cuta^ceus Z., Sowerby, Gen. fig. 3. 



Testa ovata, dorso tumido, subtus deplanata, cingulis transversis pro- 

 minulis subnodosis, varicibus diiabus, nodosis, alternis; columella um- 

 bilicata ; labro intus serie duplici crenato. 



Shell oval, tumid on the back and flat underneath, with transverse and 

 rather prominent belts, which are slightly nodulous ; varices two, knotty 

 and alternate ; pillar umbilicate, outer lip crenulate internally in a double 

 row. 



Length nearly 3 in., and half as much wide ; yellowish white, pure white 

 within ; pillar with a small nodule near the upper end. 



Three or four of these shells were cast on shore, after a 

 violent gale, near Falmouth, in Cornwall ; and we have taken 

 them on the Guernsey coast. From their worn and much 

 stained state, they appear to have come from very remote and 

 deep water. 



? Ia'nthina exi'gua Sowerby Gen, fig. 2, 3. 



Testa ovata, subfusiformi, bifariam striata, spira producta acuta. 



Shell oval, a little swollen in the middle, striate in a double direction ; 

 the spire produced and pointed. 



Length four tenths of an inch, three tenths broad ; of a violet colour, 

 and a more conical shape than L fragilis, in consequence of the spire being 

 more produced, and the volutions rounded and more distinctly defined ; 

 the mouth is also not so proportionately spread, by which it appears of a 

 somewhat spindle-like form, the primary volution being swollen and slightly 

 carinate in the middle; the striae are very distinct and elegant, oblique, 

 and turning at the subcarinate part in an obtusely angular direction. 



In the small coves about the Land's End, in Cornwall, the 

 ? lanthina fragilis is occasionally wafted, by a gentle south- 

 west wind, in prodigious fleets ; all alive, and borne upon the 

 water by their clusters of tough bubble-like vesicles. By the 

 retreating waves, most of them are carried back into the 

 ocean ; so that it requires a fortunate combination of tide, 

 wind, and wave to see them in all their splendour. This 

 mostly happens about the months of July and August. The 

 fishermen's wives call them bullhorns, which supposes a prior 

 knowledge of their appearance. Among them are sometimes 

 found a few of I. exigua; which, having been probably regarded 

 as the young of 1. fragilis, may have caused them to be over- 

 looked. 



Bu'lla zona^ta \_Turton']^ Scaphander Leach, 



Testa ovata, solida, opaca, albo et fulvo alternatim zonata, lineis trans- 

 versis elevato-punctulatis. 



Shell oval, solid, opaque, with alternate zones of white and fulvous, and 

 transverse lines of minute raised dots. 



Length a quarter of an inch, breadth nearly as much. 



