DIAGNOSES 



OF 



NEW POEMS OF MOLLUSKS 



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



BY 

 PHILIP P. CARPENTER, B.A., Ph.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 Colleotion. 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^rus*. 



Testa extus " ThracicB'" similis : intus cardine edentulo, baud 

 spathulato ; cartilagine infra umbones sita. 



1. AsthenoiJuETUs villosior. 



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

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

 et creberrime pustulosa ; rugis increment! obtusissimis, irree;ulari- 

 bus, maxitne t. juniore, ornata; epidermide tenui, pallida ohvacea 

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

 data ; marginibus 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 indentata ; eicatricibus adductorum parvis, 

 subrotundatis ; sinu pallii majore, ovali, ad dimidiura interspatii 

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



* 'A(r8(vr]s, weak ; Baioos, hinge. 



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

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

 14 209 



