240 



Triton subdistortum Triton rubecula 



cancellation cutaceum 



maculosum dolarium 



clandesttnum Tranquebaricuni 



Triton undosum. 



ROSTELLARIA. 



strom bus fusus. — Linn. 



Martini, 4, t. 158, / 1495, 1496. 



This genus approximates that of Strombus, but more 

 nearly resembles the G. Pterocera ; it consists of fusi- 

 form shells with an elongated spire, terminated below 

 by a canal formed into a pointed beak, and having also 

 a second canal ascending along the spire, formed by the 

 outer lip and the continuation of the columella; the right 

 margin is attached at the upper part to the spire, upon 

 which it is sometimes recurved at the extremity; the 

 right edge of the aperture by age becomes more or 

 less dilated in the shape of a wing, and dentated; but 

 what most particularly characterizes this genus, is the 

 sinus of the lower part of the right margin being quite 

 contiguous to the canal, which never takes place in 

 the Pteroccrao or the Strombi. In addition to this 

 description of Lamarck's, it may be well to add that in 



