ACANTHOCHITE8-\ OTOPLAJL 



lt*med lien- and there along the summit with black. Ligament 

 horny, furnished at the side of each valve with a small crest of 

 spiculu. (Hve.') 



Cape Rivers (Belcher.) 



ton ' "firostratus REEVE, Conch. Icon., t. 26, f. 137. July, 

 1847. Y.,y. Samarang, Moll., t. 15, f. 10. 



A n elongated species of somewhat compressed growth, remarkably 

 distinguished by the sharply beaked structure of the umbones; the 

 _ rained sculpture of the valves approaches that of C. hirwlini- 

 X to which it offers a singular contrast of color. (Reeve.) 



A. m-.Mi-im.i.i Pilsbry, n. sp. PL 13, figs. 65, 66, 67. 



Elongated, the valves somewhat exceeding one-third the total 

 width in dried specimens. Valves rather elevated, carinated ; red, 

 more or less maculated with white. Girdle rust-brown. 



The intermediate valves are not beaked, being somewhat produced 

 backward on each side of the apex ; tegmentum reduced to a heart- 

 *li<t],e>l <irea by the encroachment of the girdle at the sutures, leaving 

 th> valves in contact by only a xmall point at the ridge. The dorsal 

 band is very nnrmn-. parallel sided, slightly elevated, and having a 

 few longitudinal striae. The latero-pleural or side areas are sculpt- 

 witli fine flattened pustules, those on the posterior portion of 

 each valve being concave. Posterior valve elevated, the tegmentum 

 smnU, somewhat pear-shaped, narrow in front, longer thnn wide, mucro 

 at about the posterior third. 



Inferior /if/fit green at the sides, deep rose-red in the middle and at 



th posterior margin of each valve. Sutural-plates light greenish, 



the slits minute. Posterior valve not bilobed behind, having the usual 



-lite, and between them a number (6-8) of smaller, irregular and 



)in> ijnnl slits or nicks ; posterior sinus obsolete. 



Girdle wide, rusty-brown, sparsely clothed with short microscopic 

 hyaline spirules, having a fringe of longer spicules at the periphery, 

 and 1* nit her small tufts of whitish bristles. 



Length 24, breadth 1 1 mill. ; di\ i-, n-e about 115. 



Key West, Florida (Henry Hemphill.) 



This species is allied to A. rhodeus in the peculiarly narrow 

 dorsal band, the great encroachment of the girdle at the sutures, 

 etc. ; but it differs in the less developed side slits, the higher and 

 narn-w. i- tail valve and its peculiar multiple-slitting, and in other 

 features. It was rolleeted l,y Mr. Hemphill at Key West. There 



