PINNA. 



Plate XXIX. 



Species 54. (Mus. Cuming.) 



PlNN.^ Maur.\. Finn, testa obloiigd, titmidii, fusco-nigri- 

 cante, olivaceo tinctd, longitudinaliter radiatim cos- 

 tatd, costis parvu, obtum, ■mbobliteratis, postice squa- 

 miferis, squamis formcafis, tnbnlom, .mbvciirvM, n»- 

 tice suhmtiticd. 



The Mook Pinna Shell oblong, swollen, brown-black, 

 tinged with olive, longitudinally radiately ribbed, ribs 

 small, obtuse, somewhat obliterated, posteriorly full 

 of scales, scales arched, tubular, somewhat recurved, 

 anteriorly nearlv smooth. 



SowERBY, Pro. Zool. Soc. 1835, p. 84. 

 Hab. Panama (from muddy banks) ; Cuming. 



This shell is of a peculiar bistre-brown colour, running 

 into dark greenish-olive, and the spines are rather close-set 

 and of unusually regular, recurved, tubular growth. 



Pig. 55. (Mus. Cuming.) 

 The shell here figured is an accidental repetition of the 

 spined variety of P. Chemnitzii represented at Plate 1. 



Fig. 1 a. 



