DIAGNOSES 



KEW Fort:\rs or mollusks 



COLLECTED AT CAPE St. LUCAS BY Mr. J. XANTCft 



BT 



PHILIP P. CARPENTER, B.A., Ph.D. 



The specimens here described belong to the Mmseum of the 

 Smithsonian Institution, Washington, D. C. The first available 

 duplicates will be found in the British Museum or in the 

 Cuniingian Collec-tion. An account of the labours of Mr. Xantus 

 will appear in the forthcoming volume of British Association 

 Reports ; and detailed notes on the species may be consulted ia 

 the American scientific periodicals for the current year. 



Genus Asthenoth.erus*. 



Testa extus "Thracice'"' similis : intus cardine edeutulo, baud 

 epathulato ; cartihigiue infra umbones sita. 



1. Asthenothterus villosior. 



A. testa inspquivalvi, insequilaterali, unibonibus ad trientem lon- 

 gitudinis sitis ; tenuissima, alba, (sub lente) omnino minutissime 

 et creberrime pustulosa ; rugis incremeuti obtusissimis, irregulari- 

 bus, maxime t. juiiiore, ornata ; epiderniide tenui, pallide olivacea 

 induta ; parte postica truncata, paruni hiante ; antica valde rotun- 

 data ; marginibus dorsalibus et ventrali panim excurvatis ; um- 

 bonibus angustissimis ; rcgionibus lunulari et nymphali subcari- 

 natis : intus, margine cardinali utriusque valvae acuto ; ligamento 

 inconspicuo ; cartilagine subspongiosa, satis elongata, postice de- 

 flecta ; fovea haud indentata ; cicatricibus adductorum parvis, 

 subrotundatis ; sinu pallii niajore, ovali, ad dimidium interspatii 

 porrecto. Long. "38, lat. '26, alt. '14 poll. f 



* 'Xardevfjs, weak ; daioos, hinge. 



t The measures of length are taken from the anterior to the posterior 

 margins. The " detailed notes " are still in MSS. 

 14 209 



