208 



Mr. J. C. Melvill on 



doubtful forms. Recently the authorities of Stanford Uni- 

 versity, California, organized a scientific expedition to the 

 Galapagos Isles, and Mr. Snodgrass collected there one of 

 the two following, a remarkable shell, on which I have 

 obtained the opinion of Mr. Sowerby, Mr. Edgar Smith, 

 Mr. E. R. Sykes, and others, they all confirming my own and 

 Mr. Button's views that it could hardly be referred to any 

 known species. 



Cyprcea {Trivia) galapayensis, sp. n. 



C. (Trivia) testa ovato-rotunda, parva, nigrescenti-purpurea, lateri- 

 bus paullum dilatatis, extremitatibus vix productis, obtusis, costis 

 numerosis, crassis, laevibus, pallide cinereis, dorsaliter apud 

 medium superficie callosa omnino obtecta, versus extremitatetn 

 utramque callositatis, velut ocello, albo-maculata, nitidissima, basi 

 coDvexiuscula ; apertura arcuato-recta ; columella hand varicosa. 



Long. 8, lat. 5-75 mm. (spec. maj.). 

 „ 7, „ 5 „ (spec. min.). 



Hah. Insula " Albemarle," e grege Galapagensi. 



This particularly interesting and select form, of which I 

 have seen three specimens, as just stated, collected for the 

 Stanford University of California by Mr. Snodgrass, differs 

 from sanguinea, Gray, in its much smaller size, distinct 

 coloration, being blackish purple instead of madder-brown, 

 and more numerous ribs, these being flatter and thicker in 



Cyprcea galapagensis. 



proportion. But the chief peculiarity consists in the shining 

 enamelled callosity over the whole centre of the dorsal region, 

 completely obliterating the sulcus, if any exists, which I : 



