jVfr. Broderip and Mr, G. B. Sowerby on Mollusca. 49 



pearance of a Mactra, that it might at first sight be easily mistaken for 

 one. In form it is triangular, nearly equilateral, and somewhat de- 

 pressed ; its base and lower angles are rounded : it is of a pale yellowish 

 colour, with many diverging fuscous rays : within it is white, varied with 

 brownish violet, and its posterior cardinal tooth is unusually remote. 



Venus decorata. 



[Tab. Supp. xl. f. 3.] 



f^. testd cordato-trigond, latere postico productlure, alhd, liris longi- 

 tudinalihus crenulatts sulcisquo radiantibus decussatis granulosd, 

 margine cremdato. 

 Habitat ? 



This highly decorated shell (the only specimen we have seen) bears 

 some resemblance in its outward ornament to Area gradata. It was 

 brought home in the Blossora^ In Mr. Sowerby's collection. 



BULINUS BILABIATUS. 



[Tab. Supp. xl. f. 1, 2.] 



/>. testd acuminatO'Ovali, anfraetibus b, {ultimo ad basin angulatoj 

 costis elevatis obliquis distantibus, pallida fused ; aperturd auricti- 

 lari, pcristomate rejlexo, sinuoso, pone labium lamellifero ; coZm- 

 melld obtusk uniplicatd. 

 Hab. in Brasiha. 



We have placed this extraordinary shell under the genus Bulinus, 

 being unwilling to add to the list of generic names till we are compelled 

 to do so. But the species is so intermediate in its character between the 

 Auriculse and the Bulini, that it might be referred to either with little 

 violence. The mouth of the shell, as well as its general appearance, 

 is unlike that of any of the Testacea which we have seen. At a little 

 distance behind the reflected lip rises a shelly plate, which in an earlier 

 state of its existence appears to have formed the right side of the aper- 

 ture. We have only seen two specimens; but both of these have the 

 same formation which does not seem to be accidental. In the collections 

 of Mr. Bland and Mr. Sowerby. 



Both specimens appear to have suffered by exposure to the weather. 



Vol, V. D 



