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? mill. (Martens) 



Persian Gulf; Aden. 



T. satrapius MART., Vorderas. ConchyL, p. 100, t, 6, f. 50. T. ton- 

 nerrei NEVILL, Jo-urn. Asiat. Soc. Beng., 1874, p. 27, t. 1, f. 3, and 

 1. c. 1875, p. 103. 



T. CORALLINUS Gmelin. PI. 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. Mctli. 

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

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

 ? Trochus roseus VON SALTS, Reisen ins KonigreicJis Neapel, p. 376 

 (1793). Clanculus corallinus, BUCQUOY, DAUTZENBERG et DOLL- 

 FUS, Moll. Mar. du Eoussillon, 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, figs. 14, 15.) 



A common Mediterranean species exhibiting considerable varia- 

 tion iri color. The deep brown form is var. brunneus Requien. (Var. 

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



