338 



in \ndtli at both ends ; apex somewhat trilobate ; ventral valve 

 longitudinally thickened near the centre within. 



rig. 1 represents the usual variety with its peduncle. Pig. 2, 

 inside of the dorsal valve. Fig. 3, inside of the ventral ^valve. 

 Eig. 9, a variety of a brown colour, found in sand at low water, at 

 the Island of Siquijor, by Mr. Cuming. Yig. 10, a dark coloured 

 variety. 



From the Indian Ocean and the Moluccas, H. Cuming. 



2. LiNGULA HiANs (pi. Ixvil. f. 4.) Swains. 



L. testa elongato-oblonga, tenuissima, angustiori, prope basin 

 paulatim attenuata, convexiuscula. 



Shell of a lengthened oblong form, very thin and rather narrow, 

 slightly attenuated and rather convex toward the base. 



Distinguished from L. anatina by being much thinner and of a 

 more dehcate green colour ; it is also slightly and gradually atte- 

 nuated toward the base ; it only gapes at the extremities when the 

 valves are separated from the animal and dried. 



3. LiNGULA AuDEBARDi (pi. Ixvii. f. 5.) Bvoil. Zool. Proc. 

 1833. p. 100. 



L. testa elongato-oblonga, glabra, pallide flava, viridi transversim 

 picta, margine antico rotundato, viridi. 



" The rounded anterior edge of this shell is given and the trans- 

 verse lines of that colour are produced by the progressive increase 

 of the shell which is small and parcliment like. In all the dried 

 specimens the thin anterior edge is contracted into a square form, 

 but in its natural state this edge is rounded. A general contrac- 

 tion moreover gives the dried shells a narrower and more ventricose 

 character than they really possess, and the remains of the cilia of 

 the mantle give to their edges a bearded appearance.^' — Brod. 



Found by Mr. Cuming in hard coarse sand at about half tide, 

 from four to six inches below the surface, at the Island of Punam 

 in the Bay of Guayaquil. 



4. LiNGULA SEMEN (pi. Ixvii. f. 11.) Bro(l. 1. c. 



L. testa ovato-oblonga, crassiuscula, plana, albida, Ifevissima, pohta, 

 margine antico rotundato. 



Shell ovate-oblong, thickish, flattened, wliitish, very smooth 

 and pohshed ; anterior margin rounded. 



" This shell is much firmer than is usual to Llngnla, so fii'm 

 indeed as not to have contracted at aU in dr}ing. In size and 

 appearance it bears a near resemblance to a melon seed." — Brod. 



Dredged off the Isle of Plata, West Columbia; H. Cuming. 



