279 / 



Troclius Ib-iatus. Chem. Conch, v. t. 162. f. 1527. 2S. 

 Trochus parvus. Da Cojia p. 4 i . 



T. with a conic fl^icll, tapering to a fine point: volu- 

 tions fix, flat, and fi:arcely defined by any (eparating line; 

 each wrought with eight or nine fine fpiral ridges, inter- 

 fered by very fmall longitudinal (irije, molt confpicuous 

 in the larger volutions: colour cinereous, with inter- 

 rupted, longitudinal, dark, purplifli-broun lines; fome- 

 times of a dull crimfon or purplidi hue, w'ith darker lines 

 of the fame colour ; the flreaks in fome are broad, in others 

 narrow : aperture angulated ; infide pearlaceous, except 

 at the margin of the lip : bafc flat, with fine circular 

 ridges : imperforated. Size of the exiguus, and has much 

 the habit of that fliell, but is readily diftinguiflied, not 

 only bv the colour, but by being broader at the bafe, and 

 in wanting the large fpiral ridge at the bottom of each vo- 

 lution; as well as the crimfon tip. The pearlaceous in- 

 fide appears alfo another diflinguifliing characler, as well 

 as the fuperior number, and finenefs of the ridges on each 

 volution. 



We have found this fpecies plentiful amongfl fand from 

 Falmouth harbour; and not uncommon in Devovjliirc, 

 particularly in one part of Salcomb bay, where we have 

 taken them alive from the rocks at extraordinary low tides ; 

 but are feldom uncovered by the water. It is alfo found 

 on the Dorfet coafl: fparingly. Is not tlie T. parvus of 

 Mr. Adams given in the Linvcean Tranfa6iions, vol.iii, 

 t. 6^. the young of this fpecies? 



Trocliiis- 



