186 MESSES. J. C. MELYILL AISTD B. STAIfDEN OTf 



311. Baebatia (Acae) acee^a*, sp. n. (Pi. 10. fig. 15.) 

 B. testa delicata, Candida, pulchre cancellata, subquadratim 

 oblouga, convexiugcula, umbonibus incurvis, prominulis, nequa- 

 quam approximatis, margine dorsali utrinque recto, antice trun- 

 eato, deinde breviter margineiu apud ventralem rotundafco, latere 

 postico oblique producto, subcarinato, superficie alba, delicatis- 

 sime liratim costulata, liris ad latera crassioribus, sub lente 

 nodosis ; pagina iatus alba, concava, cardine dentibus plurimis 

 parum rectis prsedito, ligamento externo, sinu palliali inconspicuo. 

 Alt. 7, lat. 15, diam. 6 mm. (spec. maj.). 



Four examples, all quite perfect, o£ an exceedingly highly 

 sculptured little Acar. white, elegantly chased, and furnished 

 with many close longitudinal radiating liras ; these, when viewed 

 with the aid of a lens, are nodose, and are thicker, both posteriorly 

 and anteriorly, than in the centre of the shell-surface. In form 

 it is quadrately oblong, very convex, the umbones not approxi- 

 mate, but incurved and conspicuous ; dorsal margin straight, pro- 

 duced on both sides of the umbones, anteriorly truncate, and 

 finally merging in the rounding off of the ventral margin, this 

 being exactly parallel to the dorsal edge. Posteriorly, the shell is 

 obliquely produced, sub carinate. Within, thesurfaceis white, very 

 concave; pallial sinus only obscure; hinge with very many oblique 

 teeth in either valve, regularly arranged. 



312. Baebatia (Acae) diyaeicata, Sow. 

 Station 5, Boydong Cays. 



313. Baebatia (Acae) DOMiwaENSis, Lamarck. 



A West Indian species that seems to be making more head- 

 way, so far as distribution is concerned, in the Eastern tropics 

 than almost any other Pelecypod. It has also recently come 

 across our notice from the Arabian Sea and North-Indian Ocean 

 (^Townsend). 



Station 5, Boydong Cays. 



314. Baebatia (Agar) sculptilis, Bve. 



315. Anadaea astiquata, L. 

 Station 13, Mer (Murray Island). 



316. Anadaea clatheata, Bve. 

 Station 5, Boydong Cays. 



317. Paeallelipipeditm semitobtum, Lam. 

 Station 5, Boydong Cays. 



* ciKepaios, pure. , 



