DIAGNOSES 



OP 



NEW FORMS OP MOLLUSKS 



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



BY 

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



The specimens here described belong to the MfLseuni 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 ]\Ir. 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^rus*. 



Testa extus " Thracice''^ similis : intus cardine edentulo, baud 

 Bpathulato ; cartilagine infra umbones sita. 



1. Asthenothcerus villosior. 



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

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

 et creberrime pustnlosa ; rugis incrementi obtusissimis, irregulari- 

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

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

 data ; margiuibus dorsalibus et ventrali parum excurvatis ; um- 

 bonibus angustissimis ; regionibus lunulari et nymphali subcari- 

 natis : intus, margine cardiiiali utriusque valvse acute ; ligamento 

 inconspicuo ; cartilagine subspongiosa, satis elongata, postice de- 

 flecta ; fovea haud indeiitata ; cicatricibus adductorum parvis, 

 subrotundatis ; sinu palUi majore, ovali, ad dimidium interspatii 

 porrecto. Long. -38, lat. -26, alt. -14 poU.f 



* 'Atr^ej/^y, 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 



