12 ACANTHOCHIl 1 .-. 



whitish bunches. Length 17, breadth 8 mill. Oran, Algeria, 

 collected by Deshayes* expedition of 1842; types in the Paris 

 earn. (Rochelr. in Bull. Soc. Philomath. 1881-1882, p. 191.) 



A. DISCREPANS Br.>\vn. PI. 4, figs. 80, 81, 82. 



Shell oblong, rather elevated, carinated. Color grayish, variously 

 mottled with dull reddish-brown ; the ridge often marked with lilac 

 or black i.-h. 



M'.lian valves, when detached, showing a broadly triangular 

 .-II turn, sliirhtly beaked in the middle of the subconcave poste- 

 rior margin, the latero-anterior margin sigmoid, convex at the outer, 

 concave or subconcave toward the anterior termination ; length of 

 tegmentum contained lii times in its breadth, except the 2nd valve, 

 which is longer. Later o-pleural areas sculptured with very fine and 

 mint rnmi'1 flat-topped granules, arranged in curving slightly 

 irregular series, radiating from the beaks. Dorsal area narrowly 

 triangular, elevated at the edges, somewhat convex, finely striated 

 :t ud in ally. Anterior valve granulated, its lower margin feebly 

 scalloped. Posterior valve with central, slightly projecting mucro ; 

 the t/)/i> utmn oval, wider than long. 



Interior white, faintly tinged with blue, and more or less suffused 



with lilac-pink along the middle of the cavity. Sinus rather deep 



angular. Posterior valve having no posterior sinus or wave in the 



;if<ife, which has the usual single slit on each side, sometime, 



doubled on one side. 



Girdle broad, grayish, covered with a thick velvety pile, and hav- 

 7ft s of white, yellowish or greenish spiculesat each suture, with 

 four additional around the anterior valve; periphery of girdle not 

 V/tv/ n-i'fi, a fringe >/ .*j,!cnle8 longer than those covering the sur- 

 face. 



Length 3'J, breadth 19 mill.; divergence 105-115. 



Cli lands to Morocco and Madeira; Mediterranean and 



Seas. Low water to 25 fms., on stones. 



&' 1 .i;)WN, 111. Conch. Gt. Brit., p. 65, t. 21, f: 20 



(1827). Fou i,i^ A- EANLBT, Hist. Brit. Moll, ii, p. 396, t. 58, f. 4. 



Sown., Illustr. Index IJrit. Sh., t. 10, f. 7. JEFI i:i:v>. Brit. 



ich. iii, p. 214; v, p. 1M, t. of,, f. 4; P. Z. S. 1882, p. 667. 



\Vi INK MI i . Conchy]. Mittebn ii, p. 4 1 :',. ('/, itnn fn*,'irnhri* var. 



I'IMI... Enunfc M..II. sicil. i, p. 108, t. 7, f. 'l\ ii, p. 83. C. 

 fact'- part DBBH., in Lam^ An. a. Vert (2), vii, p. 492, and 



of P<r. 4 V Mi. -IF , REEVE, Conch. Icon., t. 10, f. 53, PETIT, Journ. 



