CYTHEEEA.— Plate VII. 



brown, smooth, 

 broad, flat. 



shining, posterior area very large. 



]M>. 



Of a much more gibbous triangular form than C. ra- 

 diata, the posterior area being peculiarly large, broad, and 

 flat. The surface is moreover smooth and glossy. 



Species 39. (Mus. Cuming.) 



Cytherea trigona. Cyth. te-itd abhreviato-t7'igond, ad 

 innhones acuminata, solidd, compressii, fiilva, rufo- 



fiisco concentrke ntidulula, latere podlc.o ■■oibanijulafo, 

 lunula oblongd, iiidistinctd. 



The TUiANGULAii Cytherea. Shell shortly triangular, 

 aciiminated at the iimboes, solid, compressed, ful- 

 vous, concentrically waved with red-brown, posterior 

 side rather angled, lunnle oblong, indistinct. 



DuNKER, MS. in Mus. Cuming. 



Hab. ? 



This appears to be a very distinct species, of solid, acu- 

 miiiately triangidar growth. It is Hnely waved through- 

 out with faint red lines. 



