72 ' TROCHUS. 



obtusely angulated; granules of rosy-red and white subalternating ; 

 suture moderate ; aperture very oblique, subquadrangular, fauces 

 sulcate, corresponding to the ridges of the exterior ; outer margin 

 obtuse, subcrenulated ; basal margin plicatulate ; columella disjoined 

 and prominently denticulate above, oblique, with 1 or 2 tubercles 

 where it joins the basal margin ; umbilicus narrow, margin not 

 crenate, with an elevated fold within, white. 



Alt. 14, diam. 14 J mill. {Martens.) 



Persian. Gulf; Aden. 



T. satrapius Mart., Vorderas. Conchxjl.,^. 100, t. 6, f. 50. — T. ton- 

 nerrei Nevill, Journ. Asiat. Soc. Beng., 1874, p. 27, t. 1, f. 3, and 

 I. c. 1875, p. 103. 



T. coRALLiNus Gmelin. PL 10, figs. 1, 2. 



Shell globose-conic, umbilicate, coral-red or brown, marked 

 beneath the sutures with narrow flames of white and maculations 

 of brown, and on the base dotted with white ; spire conic, acute ; 

 sutures subcanaliculate ; whorls 5 to 6, convex, spirally granose- 

 lirate, the last rounded, encircled by 14 or 15 conspicuously granose 

 equal ridges, the interstices finely obliquely striate, and with more or 

 less obvious spiral striae ; aperture oblique, subtetragonal ; outer lip 

 plicate within, dentate above, the tooth usually bifid ; basal margin 

 curved, crenulate within ; columella inserted deep in the rather 

 narrow umbilicus, bearing a strong dentiform fold above and a large 

 quadrangular biplicate tooth at the base ; parietal wall wrinkled ; 

 umbilicus white, smooth within, with a crenulate margin. 



Alt. 9, diam. 11 mill. 



Mediterranean and Adriatic Seas. 



Trochus corallinus Gmel., Syst. Nat. xiii, p. 3576 (1788), and of 

 most authors. — Monodonta couturii Payrandeau, Cat. desc. et. Mcth. 

 des Annelides et des Moll, de Vile de Corse, p. 134, t. 6, f. 19, 20 

 (1826). — Otavia corallina, Risso, Hist. Nat. VEnr. Merid. iv, p. 133. 

 — ? Trochus roseus von Salis, Reisen ins Konigreichs Neapel, p. 376 

 (1793). — Clanc'ulus corallinus, Bucquoy, Dautzenberg et Doll- 

 Fus, Moll. Mar. du Roussillon, p. 409, t. 50, f 1-4 (1885). — Trochus 

 multigranatus Philippi, Zeitschr. f. Mai. 1848, p. 147. — Conchyl. 

 Cab., p. 239, t. 36, f 6. (PI. 19, fig.s. 14, 15.) 



A common Mediterranean species exhibiting considerable varia- 

 tion in color. The deep brown fjrni is var. hrunneus Requien. (Var. 

 atra Monts. is a synonym.) Philippi's T. multigranatus was described 



