DIAGNOSES 



OP 



NEW EOEMS OP MOLLUSKS 



COLLECTED AT CAPE ST. LUCAS BY MR. J. XANTU& 



BY 



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



THE specimens here described belong to the Museum of the 

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

 duplicates will be found in the British Museum or in the 

 Cumingian Collection. 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 in 

 the American scientific periodicals for the current year. 



Genus ASTHENOTH^ERUS*. 



Testa extus "Thracice" similis : intus cardine edentulo, haud 

 spathulato ; cartilagine infra umbones sita. 



1. Asthenoth&rus villosior. 



A. testa insequivalvi, insequilaterali, umbonibus ad trientem lon- 

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

 et creberrime pustulosa ; rugis incrementi obtusissimis, irregulari- 

 bus, maxime t. juniore, ornata ; epidermide tenui, pallide olivacea 

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

 data ; marginibus dorsalibus et ventrali parum excurvatis ; um- 

 bonibus angustissimis ; regionibus lunulari et nymphali subcari- 

 natis : intus, margine cardinal! utriusque valvse acuto ; ligamento 

 inconspicuo ; cartilagine subspongiosa, satis elongata, postice de- 

 flecta ; fovea haud indentata ; cicatricibus adductorum parvis, 

 subrotundatis ; sinu pallii majore, ovali, ad dimidium interspatii 

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



* 'A.cr6i>r)s, weak ; Qaiobs, hinge. 



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

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



14 209 



