490 Dr. J. Gwyn Jeffreys on 



Druce tells me that it has already received a name ; but I can 

 tind no published description of it, although I have gone care- 

 fully through the Records. 



Herpcenia tritogenia, Klug. 



This and the preceding species are evidently not rare in 

 Abyssinia. H. eripMa^ which I have examined from Angola, 

 is a larger and more creamy-coloured species than H. trito- 

 genia (with which it has been united). I think the two forms 

 will prove to be perfectly distinct : the markings are not quite 

 the same on the hind wings. 



Hesperiidae. 

 Pampliila inconspicua^ Bertoloni. 



Pyrgus (close to P. gaiha). 



Thanaos (two species near T. Motozi^ Wllgr.). 



Tagiades (very near to T.flesus^ Fabr.). 



The HesperiidjE require figures to distinguish them readily 

 from species already described, to which they are nearly 

 allied. 



XLIX. — New and peculiar Mollusca of the Kellia, Lucina, 

 Cyprina, and Corbula Families pyrocured in the ' Valorous ' 

 Expedition. By J. Gwyn Jeffreys, LL.D., F.R.S. 



Kelliidse. 

 Montacuta Dawsoni^ Jeffr. 



Montacida Dawscmt, Britisli Concliology, vol. ii. p. 216 ; vol. v. p. 178, 

 pi. xxi. f. 27. 



Godhavn, Disco, 5-25 fms. ; Station 4, 20 fms. ; St. 5, 

 57 fms. ; Holsteiuborg, 3-35 fms. ; St. 9, 1750 fms. ; Green- 

 land (coll. MoUer, in Mus. Reg., Copenhagen) : Drobak (J. G. 

 J.): Floro, Norway, 300 fms. (Friele) : 'Porcupine' Expe- 

 dition, 1870, off Cape Sagres, in the Bay of Biscay; a valve 

 only:- Palermo (Monterosato). 



Body whitish and gelatinous : mantle plain-edged, although 

 at first I thought the edges were ciliated, in consequence of 

 the posterior side of the shell being fringed by the polyparies 

 of a minute Hydrozoon ] the incurrent opening is wide and 

 not tubular. 



