TROCHUS. 507 



We have hesitated to unite the Mediterranean fyra^iii- 

 datus (Lam. Anim. s. Vert. (ed. Desh.) vol. ix. p. 150. — 

 Deles, Ree. Coquil. Lam. pi. 36, f. 2. — T. crenulatus, Phi- 

 Lippi, Moll. Sicil. vol. i. p. 176 ; vol. ii. p. 1 50. — T. 3Iatoni, 

 Payraud, Moll. Corse, p. 126, pi. 6, f. 5, 6. — T. tricolor, 

 Eisso, H. N. Europe Mer. vol. iv, p. 127, fig. 135 ?), al- 

 though a more extended knowledge of the essential dif- 

 ference between specific and varietal distinction, or the 

 acquisition of intermediate examples, may render their 

 union advisable. Our specimens of the latter shell are 

 greatly more produced, have more numerous whorls, the 

 lower ones of which are retuse rather than flat, are longi- 

 tudinally painted, besides being articulately marked upon 

 the raised sculpture, with brown or red spots, that do not 

 extend to the articulated marginal belts, or else are 

 obliquely striped (and upon the base likewise) with blackish 

 brown longitudinal streaks. The interstitial strise, more- 

 over, are so fine, as to be almost imperceptible, and the 

 marginal belts are broader in proportion to the granulated 

 spiral costellse. 



The animal has tlie sides of the foot, the tentacles, and 

 lateral cirrhi tinged with madder red. The eye-peduncles 

 are white, as is also the disk of the foot. 



This shell is almost confined to our southern shores. It 

 occurs at Guernsey (Barlee) ; Herm, Torquay, and Mar- 

 gate (S. H.) ; in seven fathoms, alive, Weymouth Bay 

 (M'Andrew and E. F.) ; Cornwall (Dr. Turton) ; Bantry 

 Bay (L. W. DilKvyn) ; Cork (Humphreys) ; Dublin Bay 

 (Warren). The four latter localities are communicated by 

 Mr. Jeffreys. 



It is not found to the north of the British isles, but 

 ranofes southward to the Mediterranean. 



