Diagnoses of new Species of Molltjsks, from the Wesi 

 * Tropical Region of North America, principally col 



lected by the Rev. J. Rowell, of San Francisco. B'S 



Philip P. Carpenter, B.A., Ph.D. 



Of the new species quoted in the " Supplementary Report on the 

 Present State of our Knowledge of the Mollusca of the West Coas* 

 of North America," published in the Transactions of the British As 

 sociation, 1863, pp. 517-686, the principal portion (namely, those 

 dredged by Dr. J. G. Cooper, Zoologist to the Californian State 

 Geological Survey) are described in the ' Proceedings of the California 

 Acad. Nat. Sciences,' for 1864-6.5; those dredged in Puget Sound, 

 during the U. S. North Pacific Boundary Survey, by the late Dr. 

 Kennerley, are described in the 'Journal of the Philadelphia Acad. 

 Nat. Sc' for the present year. The species obtained by the natu- 

 ralists of the British Survey are described in three papers by Dr. 

 Baird and myself, P. Z. S. 1863-6.5. The new species sent by 

 Mr. J. Xantns from Cape St. Lucas, and by Mr. J. G. Swan from 

 Neeah Bay, appear in the 'Ann. and Mag. Nat. Hist.,' 186-1-65. In 

 the same Journal are described the new species which I found in 

 Col. Jewett's collection. Those sent to Dr. Gould from the same col- 

 lection had been previously analyzed in the ' Proc. Zool. Soc' 1856. 

 The above are the principal sources of fresh knowledge; but a number 

 of species from the Californian province, which do not range under 

 any of these heads, will be found in the 'Journal de Conchy liologie' 

 for the current year. 



In separate papers communicated to the Zoological Society are the 

 diagnoses of additional species from Prof. Adams's Panama and from 

 M. Reigen's Mazatlan collections. The remaining species, from the 

 tropical province, are embodied in the present paper. The types 

 (unless otherwise stated) are in the Museum of the Smithsonian 

 Institution. 



(Tellina) Angulus decumbens. 



A. t. tenui, subplanata, ulha sen rosacea; I(svi, striolis incrC' 

 menti insculpta ; epidermide pallide straminea induta ; anfice 

 et ventraliter valde producta ; postice truncata, angidata ; 

 umhonibus acutioribus, vix prominentibus ; marginibus dorso' 

 libus postico i-ecto, antico ad angulum parum excurvato, anf.ico 

 et ventrall valde et regulariter excurvatis ; parte postica v. 

 dexfr. subito angulata, v. sinistr. parum sinuata ; nymphis an- 

 gvstis, elongaiis, cartilagine omnino externo : dent. card. ni9 

 nimis ; dent. lat. v. dextr. antico satis conspicuo, postico obso- 

 leto; V. sinistr. nuUis ; cicatr. adduct. 2^osficis subrhomboideis, 

 anticis valde elongatis, angustis ; sinu pallii maxima, subtri' 

 anguluri, usque ad cicatricem alteram utraqiie valva porrecta. 



Long. 1-7, lat. 1-2, alt. -68 poll. 



Hub. Panama (teste Rowell, Pease). 



This shell was atriliated bv Mr. llanley to the W. African T. 

 ' Til 



