< ALLIOSTOMA. 387 



(Group of C. miliaris Brocc.) 

 C. MILFARIS Brocchi. PI. 18, figs. 10, 11 ; pi. 15, figs. 41, 42. 



Shell strictly conical, imperforate, rather thin, but pretty solid, 

 whitish or yellowish^ with more or less obvious longitudinal flame^ 

 often reduced to a few spots on the ribs and a row of spots at the 

 periphery of each whorl. Surface densely finely sculptured lt f spiral 

 lirce crossed by very regular oblique lamella, producing a clatkrate 

 patt rn, spiral lirse about (> in number on each whorl, but often 

 double as many, by the intercalation of riblets in the interstices. The 

 periphery has a prominent keel, cord-like, with secondary spiral strhe, 

 or bifid, cut into compressed granules, somewhat prominent above 

 sutures. The base has about 8 concentric ribs, interstices 

 1'atelv striate, sometimes with a central riblet. Spire coni.-al 

 periphery acutely angled, base fiat. Whorls about 7, aperture quad- 

 rangular, columella short, nearly straight. Alt. 13, diam. 13 mill. 

 Mediterranean and Adriatic Seas; Atlantic Ocean, Xor.ca,, to 

 Gibraltar; Cape, Verde Is.; Miocene of Vienna, Italy, etc. 



Tr. miliaris Biiorc. Conch, fbss. Subap., p. 353, t. 6, f. 1 (1814) 

 -Rrsso, Km-. Merid. iv., p. 130. PHILIPPI, Conchyl.' Cab,, p. 71 

 *" 1: ;j' f " 19 - BUQ- DAUTZ. and DOLLF., Moll, du Rouss., p. 357] 

 t. 42, f. 20-25. Trochus martini BROWN, 111. Conch. Gt. Brit., p.' 

 29, t. 57, f. 11 (1827). THORPE, Brit. Mar. Conch., p. 164, t. 3, f. 

 -7V. willa/num* PHILIPPJ, Enurn. Moll. Sicil. i, p. 183, t !()' f 

 25 (1836) ; Conchyl. Cab., p. 88, t. 15, f. 9. JEFFREYS, Brit.' Conch' 

 in, p. 325 ; v, p. 204, t. 63, f. 4. FISCHER, Coq. Viv, p. 146, t. 49 

 l.Conulus millegranus Phil., SARS, Moll. Reg. Arct. Norv., p! 

 43, t. iv, f. 3 (Dentition). Ziziphinm millegranus Phil. BRUSIXA 

 bntr. pella Fauna Dalm, p. 79. T. delandi WOOD, Ind. test! 

 suppl., t. 5, f. 15. T. clelandianis LEACH, Synops. Moll. Gt. Brit.,' 

 P- !<"- T. elegans JEFFR., teste Jeffreys. 



The clathrate sculpture is very characteristic. 



( Group of C. zizyphinum Linn.) 



^ The Mediterranean species of Calliostoma immediately allied to 

 C. zizyphinum form a group very closely allied in characters, and 

 at the same time each species is excessively variable. The char- 

 acters common to the group are the straightJy conoidal .outline gran- 

 ulate upper whorls, the lower ones polished and either smooth or 

 spirally sulcate. The following species are included: zizyphinum 

 conidiim, gualterianum, laugieri, etc., each with numerous synonyms' 



