380 



SHELLS AND SHELL-FISH. 



PAKT II. 



Hyria Lam. Hinge margin straight ; both extre- 

 mities elevated and winged ; cardinal teeth very 

 long, and resembling lateral teeth. {ji(j, 124.) 



syrmatophora Gmelin, 3222. corrugata. En. Meth. pi. 247. 

 elongata ^«;. Ex. Conch. f. 2. 



pi. 24. 



HvridellaSw. Transversely oval; bosses not sulcated; 

 posterior margin elevated and winged ; one cardinal 

 and one lateral tooth in each valve. 



H. australis. Lam. Sys. vi. 1. p. 80. 



SUB-FAM. 3. IRIDININ^. 



Narrow and greatly elongated ; hinge margin without 

 teeth, but sometimes granulated, {fig. 123. e, f.) 



Iridina Lam. Hinge margin granulated. 



I. striata Sw. Monog. En. ovata Sio. Monog. 



Meth. 204. bisl.* elongata 5'o<f. (^private plate). 



Calliscapha Sw. Hinge margin smooth. 



C. Nilotica Sow. Zool. Journ. i. pi. 2. 



Mycetopus D' Orb. Pod-shaped ; hinge margin straight, 

 smooth ; the extremities obtusely rounded, or sub- 

 truncated ; considerably gaping ; animal perforating 



Solenoides, Sow. Man. f. \5l. 



* The figure reinesents this as an "arcuate" shell, very diifereiU from 

 that figured by the late Mr. Sowerby. 



