~ MOLLUSCA. S3 



i 

 2. TnnAO iA trigonalis. PI. XXIV. Tig. 8. Tlir. testa trigono-ovata, subsequivalvi, irregulari, pellu- 



cido-alba, concentrice elevato-striata, antice rotundata, postice angulato-flexuosa, margine ventrali postice 



sinuato. 



Hab. Sooloo Archipelago. 



We have some doubt of this being a true Thracia, but know not any genus to which it 

 could be better referred. 



93. CORBULA, Lamarck. 



1. Corbijla ventricosa. PI. XXIII. Fig. 12. Cor. testa subtrigono-ovata, ventricosa, antice ro- 

 tundata, postice paulxim longiore, angulata, subtruncata, sordide alba, epidermide fusca partim induta. 



Hab. China Sea. 



A very dull simple species, peculiar in form. 



2. Corbula variegata. PI. XXIII. Fig. 14. Cor. testa trigono-oblonga, latere postico multb 

 longiore, attenuate, rostrate, valde augulato, concentrice plicato-costata, alba, croceo et rufo-spadiceo varie- 

 gata, margine ventrali incrassato, roseo maculato. 



Hab. China Sea. 



A very conspicuously painted species, of quite a different type from the preceding. 



94. LYONSIA, Turton. 



1. Ltoxsia navicula. PL XXIII. Fig. 11. Lyon, testa oblonga, gibba, tenui, fragili, antice ro- 

 tundata, postice cornpressiuscula, subtruncata, hiante, radiatirn striata et obscure lirata, liris distantibus, epi- 

 dermide flaveola, margine ventrali flexuoso. 



Hab. Shores of Borneo (dredged from a depth of about eleven fathoms). 



A fine characteristic species, of which only a single specimen was collected. 



95. POROMYA, Forbes. 



1. Porohya pulchella. PI. XXIII. Fig. 1. Por. testa oblongo-ovata, tenui, fragili, alba, pellucida, 

 nitente, concentrice pUcata, plicis obtusis, subdistantibus, antice rotundata, postice attenuata, rostrata. 



Hab. Shores of Borneo. 



A very delicate transparent species, of which many were collected on the coast of 

 Borneo. 



2. Poromya nitida. PL XXIII. Fig. 3. Por. testa subgloboso-trigonali, alba, seinipellucida, laevi, 

 nitida, latere antico rotundato, postico acute acuminate-rostrate, concentrice sulcato, radiatirn impresso, ad 

 marginem angulato, umbonibus phcato-sulcatis. 



