180 PURPTTROIDEA, LYSIS, JOPAS. 



P. ANOMALA, Angas. P. 121, PL 36, fig. 422. 



This is described as a Cronia, but does not resemble the group 

 at all ; it is so like OHnebra that I have preferred to place it 

 there. 

 P. AVELLANA, Reeve. PL 55, fig. 179 



Shell smooth, distantly plicately ribbed ; white, mottled with 

 chocolate-color ; lip thickened and dentate within. Length, 1 in. 



N. Coatt of Australia. 



Described as a Buccinum, with simple lip. H. and A. Adams 

 included it in the genus Clavella ; its really thickened, dentate 

 lip (per specimen before me) and longitudinal ribs, together with 

 its form, show it to belong rather with Cronia. 



Genus PURPUROIDEA, Lycett. 



This fossil genus has been confounded with Purpurina, d'Orb. : 

 its typical forms appear to be true Purpuras, and the species I 

 figure has some resemblance to the recent P. chocolatum ; whereas 

 the species of .Parpurirta are nearly related, apparently, to 

 Gancellaria. 



P. NODULATA, Lycett. PL 55, fig. 180. Oolite. 



Genus LYSIS, Gabb. 



Founded on L. duplicata, a cretaceous fossil from California, 

 and supposed by its author to be nearly related to Stomatia. I 

 have examined authentic specimens in our museum, and do not 

 hesitate to refer it to the Purpurse. 



L. DUPLICOSTA, Gabb. PL 55, figs. 182, 183. Cretaceous, 



California. 

 Genus JOPAS, H. and A. Adams. 



J. SERTUM, Brug. PL 55, figs. 181, 188-190. 



Shell varying from smooth or finely striate, to a form covered 

 with small revolving ribs, which are sometimes decussated and 

 rendered granulate by growth-lines. Chestnut-brown, more or 

 less undulately marked with yellowish white, and having an in- 

 terrupted white band on^the periphery. Sometimes purplish 

 red, with the band and maculations light purple. Aperture 

 whitish or cream-color, the lip margin and coltimella brown or 

 blackish. Length, 1-5-2-25 inches. 



Red Sea to Paumotus Isles. 



