II AITKMMX. 



58. ASPERGILLUM SPARSUM. 



A. vagiiiA laevi, disco postico fimbria radiatA circum- 

 dato, tnbulis fimbriae majusculis,poris disci postici 

 majusciilii-, sparsis. 



Ohs. It is rather doubtful which of the two spe- 

 cies in this collection (leaving A. vaginiferum out of 

 the question) ought to be considered as A. Javanum 

 and which is undescribed by Lamarck. The great 

 differences consist in the number and size of the 

 tubes of which the radiated fringe is composed, and 

 in the number and size of tlie perforations in the 

 disk, both of which, in the species I have here called 

 .4. sparsum, are twice as large and not half sq nume- 

 rous as in that which 1 have considered as A. Ja- 

 vanum. 



116. MACTRA ELEGANS. 



M. testA rotundato-trigonft, tumida, tenui, antice 

 acute carinatA, superficie cleganter conceutrice 

 sulcata ; sulcis rotundatis. 



Ohs. A much rounder and more tumid shell than 



Mactra plicataria. 



117. MACTRA ASPERSA. 



M. testa elliptica, insequilatcrali, antico latere postico 

 duplti longiore, umbonibus subpromincntibus, su- 

 jierficic sulcis transvcrsis obsoletiusculis ; colore 

 alhido, fusco asperso. 



Obs. Tliis shell resembles Venus virginea in 



general form, like that shell it is smooth and slightly 



grooved transversely ; it is, however, of a whitish 



colour speckled with brown. 



121. CRASSATELLA RADIATA. 



C. testti arcuatfi, antice acute rostrata, carinatft ; su- 

 perficie arcuato-sulcatii, maculis spadiceis inter- 

 ruptis radiatA. 



