LECHMERE GUPPY FAUNA OF GULF OF PARI A. 
155 
pointed calcareous rostriform appendages which cross 
each other, in different specimens with the beak of 
either above or below. Umbones round, terminal. 
Ventral edge scarcely curved. Dorsal edge slightly 
angulate. Length 35-45, height 10, thickness 11 mill. 
This shell differs from L. caudigerus , its West 
African analogue, in being more cylindrical ; the 
umbones are usually less prominent and more nearly 
terminal ; the dorsal edge has rarely so pronounced an 
angle. Burrows in soft limestone and corals. 
[Sub-order Pectinina.) 
Perna Bruguieres 1792. 
175. P. obliqua Lam. 
P. ephippium Sow. (not Linn.) Woodward, pi. xviL, 
f. 2. 
Ostrea alata Gmelin. 
176. P. chemnitziana Orb. 
P. vulcella (b) Lamarck. 
Concha semiaurita Chemnitz. 
Perna bicolor Adams. 
Pecten (Gualtieri) Bruguieres 1797. 
177. P. nucleus Born. Wood, Ind. Test. Ostrea, 47. 
P. turgidus Lam. 
178. P. nodosus Linn. Chenu, vol. ii., f. 922. 
179. P. circularis (?) Sow. Thes. Conch., pi. xii., f. 28. 
Lima Bruguieres 1792. 
180. L. scabra Born. Chenu, Man., vol. ii., f. 954, 955. 
L. aspera Chemn. 
L. bullata Born. 
