SHELLS AND SHELL-FISH. PART II. 



HYRIA juam. Hinge margin straight ; both extre- 

 mities elevated and winged :; cardinal teeth very 

 long, and resembling lateral teeth, (fig. 124.) 

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

 elongata Sw. Ex. Conch. f. 2. 

 pi. 24. 



H YRIDELLA Sw. 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. IRI DININJE. 



Narrow and greatly elongated ; hinge margin without 

 teeth, but sometimes granulated, (fig. 123. e, /.) 



IRIDINA Lam. Hinge margin granulated. 

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



Meth. 204. bisl.* elongata Sow. (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. 151. 



* The figure represents this as an " arcuate" she! 1 , very different from 

 that figured by the late Mr. Sowerby. 



