782 TROCHUS. 



Tfochus umbilicaris. Linnccus S^st. Nat. p, 1229. Che?n- 

 nitz, V. p. 106. t. 171. f. 1666. Schroeter EmL i. 

 p. 660. Gmeliu, p. 3568. Schreibers Conch, i. p. 243. 



Inhabits the Mediterranean. Linnccus. 



Linnzeus has not given any reference, and only savs, in addition 

 to his specific character, that the shell is often clouded with 

 ferruginous, that the summit and inside are white, and that 

 it has an exactly cylindrical pervious umbilicus. The shell 

 figured by Chemnitz is about seven lines long and eight broad, 

 of a blackish grey colour, with darker oblique longitudinal 

 markings. Born, though he has quoted the T. umbilicaris 

 of Linnaeus and Pennant, has figured under this name a very 

 different shell, which is the T.fuscatus of Gmelin. 



AREOLA. 56. Shell ovate, transversely striated, 

 white tessellated with red, and the spire 

 somewhat produced ; aperture round, and 

 the umbilicus creuated. 



Trochus Areola. Chemnitz, v. p. 134. t. 173. f. 1710 and 

 1711. Gmelin, p. 3575. Schreibers Conch, i. p. 248. 



Trochus, No. 99. Schroeter Einl. i. p. 718. 



Inhabits 



Shell about six lines long and seven broad, white with reddish 



square spots in transverse rows, and the whirls separated by 



a white band. 



ciNEREUS. 57. Shell pyramidal, with flattish whirls 

 separated by a very depressed suture, and 

 the umbilicus cylindrical ; base concave. 



Trochus cinereus. Da Costa Brit. Conch, p. 42. t. 3. f. 9 

 and JO. Montagu Test. p. 289, and Supp. p. 119. 

 Donovan, v. t. 155. f. 3. JSIaton and Racket, in Lin. 

 Trans, viii. p. 152. 

 Trochus, No. 116. Schroeter Einl. i. p. 7^5. 

 Le Petit Entonnoir. Favanne, ii. p. 352. 1. 13. f. M. 

 Lister Conch, t.633. f. 21. 



Inhabits the Mediterranean. Montagu. 



Da Costa, who erroneously states that it is common on the 

 British coasts, has given the following description of this 

 species : " The shell is thick and strong, of the size of a 

 cherry, shape obtusely pyranjidal, or not quite tapering to a 

 point. The base is very concave, with some circular fur- 

 rows; the mouth roundish and capacious, within fine 

 mother-of-pearl ; the outer lip smooth and even ; the inner 



