P A N P ^ A. 



species S. (Mus. Paris.) 

 Panop.EA attenuata. Pan. testa elonijatA, anguata, 

 Ixevigald ; latere antico Uitioii, oblique truncato, 

 margine doTsali elevato ; medio comprcsso, mn- 

 bimibus parvum promt nentibus. maiyinc ventrali 

 recto ; latere postico attenuata, ad terminum ar- 

 cualo, valde sursiun acclivi, termino ob/it/ii? trun- 

 cato, margine dorsali deprcaso, arcuato. 



The attenuated Pa.noi'^a. Shell elong:ited, narrow, 

 smooth ; anterior side wider, obHquely truncated, 

 dorsal margin elevated ; middle compressed, iim- 

 hones little prominent, ventral margin straight ; 

 posterior side attenuated, arched al tlie end, 

 strongly sloped upwards, end obliquely truncated, 

 dorsal margin depressed, arched. 



Febrm, 



I'anopaia Anstralis, Valenciennes, not Sowerbv. 

 I/ab. Port Natal. 



We have no reason to suppose that this shell is 

 identical with the P. auslralin of Sowerby, or that the 

 last mentioned species ever attains a larger size than 

 the one represented in Plate VI. of this monograph. 

 M. Valenciennes having received a drawing of a 

 smaller specimen in the Cumingian Cabinet by Mr. 

 Sowerby, imagined it to represent the young of liis 

 gigantic species; an opinion which we cannot share. 

 Panopwa attenuata differs from the two preceding 

 species in shape and proportions, as will be seen from 

 the figure which we have copied. 



