tinctness. Its ribbed surface and destitution of stria? distinguish 

 it from all the varieties of L. pintadina. 



Patella citrullus. Testa depresso-conica, sub-equilateralis, 

 translucida, extus rugoso-undulata, prope apicem lineis granuli- 

 feris radiata, pallide olivacea, intus nitida, plumbea, fundo albido : 

 apertura rotundato-ovata ; margine expanso, acuto. Long. 1£, 

 Iat. 1£, alt. I poll. Hab. Funchal, Madeira. 



This shell resembles somewhat the skin of a cucumber, exter- 

 nally. The radiating strise occupy the upper half of the shell, 

 and the lower half is somewhat imbricated by the stages of 

 growth. It is somewhat like P. Candei, D'Orb. 



Patella Paumotensis. Testa solida, albido-cinerea, ovalis, 

 depresso-conica, apice sub-centrali, costis acutis radiantibus irre- 

 gularibus ad 40 instructa : facies interna alba vel dilute incarnata ; 

 impressione musculari callosa, alba vel citrina. ; area centrali fer- 

 ruginea vel incarnescente : margo costis dentatus, spatiis inter- 

 costalibus fusco tinctis. Long. If, lat. 1£, alt. £ poll. Feejee's. 

 Long. 1}, lat. 1£, alt. f poll. Wilson's I. Long. 1^, lat. 1, 

 alt. f poll. Rose I. 



Allied to P. tramoserica, but its colors are generally dull and 

 dead, instead of silky. Generally, eight or ten of the ribs are 

 more prominent than the rest The prevailing color of the in- 

 terior is that of ripe muskmelon. Sometimes there are dusky 

 spots between the ribs. It seems to be found at all the islands of 

 the Paumotu group, and as far as Taheiti. 



Patella luctuosa. Testa oblique conica, crassa, vertice 

 eccentrica, obscure olivacea, interdum sanguineo tincta, costis ma- 

 joribus ad 12 rotundatis, scabrosis, pallidis, minoribus quibusdam 

 interjectis : apertura ovalis ; margine crenulato : facies interna 

 livida, reflexionibus succineis micans ; limbo fasciis fuscis et al- 

 bidis inequalibus alternantibus radiato. Long. 1^, lat. 1, alt. J 

 poll. Hab. New Zealand. 



Unusually rough and irregular of surface, not unlike coarse 

 specimens of P. vulgata, but the interior sometimes rivals P. tra- 

 moserica. 



Patella piperata. Testa scsbrida, oblique conico-depressa, 

 olivacea, costato-striata, costis majoribus pallidioribus cum lineis 

 saturatioribus interruptis aspersis, apice eccentrica, acuta : aper- 



