14 ACANTHOCHITES. 



most minutely radiate. Marginal ligament wide, black or brownish, 

 having 9 dense, elongated bunches, whitish or reddish. 



Length 15, breadth 9 mill. (Rochebr.} 



Strait of Saint Lucie ; Santiago, Cape Verde Archipelago. 



A. bouvieri ROCHEBR., Journ. de Conchy 1. 1881, p. 45 ; Bull. Soc. 

 Philom. 1880-'81, p. 117; Nouv. Arch, du Mus. (2)iv,p. 239, 1. 17, 

 f. 10a, b. 



The front valve is triangular, the posterior valve quite wide, 

 rounded. It occurs also at Dakar and Goree, on the mainland of 

 Africa, living with A. adansoni. 



The artist who drew Rochebrune's figures omitted the slits in the 

 insertion-plates ; he supplied several extra girdle-tufts ; and finally, 

 he represented only seven valves, and these are very incorrect at the 

 sutures. To what extent the figures may be otherwise faulty I can- 

 not tell, but I have very grave doubts about the correctness of the 

 sculpture of the dorsal areas represented in the detail figure. 



A. GARNOTI Blainville. PI. 14, figs. 11-16. 



Shell elongated, rather depressed, not carinated. Brownish, with 

 two slightly diverging whitish stripes bounding the dorsal area. 



The median valves are rather beaked when not eroded. The 

 tegmentum varies on different valves from subpentagonal to sub- 

 quadrangular: Latero-pleural areas closely and evenly covered with 

 elongated granules. Dorsal areas triangular, rather wide in front, 

 no* sharply defined at the sides, closely striated longitudinally, the 

 striae coarser at the sides, and becoming transformed into the gran- 

 ulation of the side areas. Posterior valve small, the tegmentum 

 broader than long. Posterior sinus shallow, with a slight lobe and 

 on each side a slit. Mucro behind the middle. 



Interior a rather dark blue-green, the cavity and central callus of 

 each valve purple-brown. Sinus wide and rounded ; sutural laminae 

 very large, well rounded at their anterior extremities, about equal in 

 area to the tegmentum, side slits inconspicuous, posterior. 



Girdle "dirty-green, closely covered with clear or dark-green 

 bristles, white at the periphery, and having 18 bunches of numerous 

 radiating bristles, which are dirty-green, hyaline, very brittle and 

 over 2 millim. in length." 



Length 20, breadth 10 mill, (specimen.) 



Length 1 inch, 6 lines, breadth 1 inch (Quoy & Gaim.) 



Table Bay, Cape of Good Hope. 



