L'l' NTHOCHITES. 



(4) Specie* of the lies and in >7 J HI/ //<./. 



A. SPICULOSUS Reeve. PI. 1 ), furs. 60, 61, 62. 



Shell snmrwhat rlonirah'ly ovate, valves semilunar, rough through- 

 out; blackish-brown : ligament horny, furnished with thick tufts of 

 briirht olive glassy spicula?. (Reeve.) 



West In< I if*. 



Chiti'H fjn'cn/iwi It i. i:\-i:. ( 1 onch. Icon., t. 9, f. 47 (Feb., 1847). 

 Aeanthoohiton spietUosut ( YK. MS. 



This form is probably merely a dark specimen of the species after- 

 ward described by Reeve as C. astriger. Mr. E. A. Smith has 

 expressed his belief that this is the case, in Journ. Linn. Soc. Lond. 

 ]>. l!>7. 



Var. ASTRIGER Reeve. PL 13, figs. 55, 56, 57. 



Shell oblong, rather depressed, not carinated. Valves variously 

 colored, green or olive-green, usually tinged with brown on the sides, 

 often marked with rather wide white stripes at the sides. 



The valves are generally more or less encrusted. Dorsal areas 

 narrow, slightly raised at the edges, convex and shining, marked by 

 delicate longitudinal strue and transverse growth-lines. Lat> ro- 

 Itliiirttl ////'/< very minutely and evenly granulated, the granules 

 rounded. Posterior valve small, its tegmentum slightly longer than 

 broad, the mncro near the posterior margin. 



Interior blue-green; sinus wide, deep and subangular; sutural- 

 laminie large, blue-green. Insertion-plate of the posterior valve visible 

 l hi nd, as well as at the sides of the tegmentum when viewed from 

 above; posterior outline bilobed, having a median sinus, and slits 

 outside of the lobes. 



Girdle minutely velvety, olive-green, having 18 very large con- 

 spicuous tufts of greenish-white spicules; the periphery bearing a 

 fringe of spicules. 



Length 20-22, breadth 9 mill. 



Florl'f'i Knjs to Barbados, W* 



Chlf'n, asfn'ger Iti :i \ i , < Miich. Icon., t. 18, f. 109 (April, 1847). 

 Phafollopleura (Acanthoehites) n*trigera SHUTT., Bi-rn. Mittheil. 

 1853, p. 79. Acanthochllon Jri<j, r DALL, Bull. 37, U. S. Nat. Mus. 

 I>. 174. Chiton (Acantfioc/iitoH) u.ftriger SMITH, Journ. Linn. Soc. 

 Lond. xx ? p. 496(1890.) 



i'litional Inralitics arc: (Guadeloupe (Siviff) ; St. Thoma- 

 (Blanner)', Tortugas (Dall), and Fernando Noronho 

 Rama* 



