148 



Trigonia shell. The genus has been collected abundantly in the neigh- 

 bourhood of Moreton Bay by Mr. Strange, attached to the shells of Tri- 

 gonia, Pectunculus, and Crassatella, as well as to stones ; and five species 

 have been made of them. 



Species. 



1. Anomioides, Stutch. 3. Strangei, Adams. 5. transversa, Adams. 



2. Keppelliana, Adams. 4. Stutchburyi, id. 



Figure. 



Miochama Anomioides. PI. 41. Fig. 227. Shell, adhering to a Tri- 

 gonia, showing the ribbed growth of its upper valve occasioned by 

 the Trigonia ribs beneath the lower valve. 



Genus 3. MYODORA, Gray. 



Animal ; undescribed. 



Shell ; triangularly ovate, inequivalve, rigid valve concave, left 

 valve jlat ; umboes somewhat involutely beaked ; hinge composed 

 of two prolonged interlocking lateral teeth, generally more or 

 less obsolete, enclosing a central triangular pit containing the 

 ligament, having generally a sickle-shaped ossicle in connection 

 with it. 



A small group of white shells, pearly in the interior, of rather solid 

 growth and characteristic triangularly beaked form, in which the margin 

 of one valve becomes consolidated into a tooth-like ledge or projection 

 diverging on each side from the umbo, and fitting into projections of simi- 

 lar construction in the other. Between the diverging points of these 

 somewhat obsolete ledge-like lateral teeth a triangular pit is formed for 

 the ligament, and in connection with it is a detached sickle-shaped ossicle. 

 The animal has not been described, but there cau be little doubt of its 

 affinity with Pandora and Anatina. 



Myadora striata, the principal type of the genus, is a native of New 

 Zealand ; the smaller species were collected by Mr. Cuming at the Philip- 

 pine Islands. 



