278 DR. P, P, CARPENTER ON NEW SPECIES -[Mar. 14, 
5. DIAGNOSES OF NEW SPECIES Or MoLuusks, FROM THE WEST 
Trovican Recion or NortH AMERICA, PRINCIPALLY COL- 
LECTED BY THE Rey. J. ROWELL, or SAN Francisco. By 
Puitie P. Carpenter, B.A., Pu.D. 
Of the new species quoted in the ‘ Supplementary Report on the 
Present State of our Knowledge of the Mollusca of the West Coast 
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 1864-65; those dredged in Puget Sound, 
during the U. 8. North Pacifie Boundary Survey, by the late Dr. 
Kennerley, are described in the ‘ Journal of the Philadelphia Acad. 
Nat. Se.’ 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. 1863-65. The new species sent by 
Mr. J. Xantus from Cape St. Lucas, and by Mr. J. G. Swan from 
Neeah Bay, appear in the ‘ Ann. and Mag. Nat. Hist.,’ 1864-65. 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 Conchyliologie’ 
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. ¢. tenui, subplanata, alba seu rosacea; levi, striolis incre- 
menti insculpta ; epidermide pallide straminea induta ; antice 
ef ventraliter valde produecta; postice truncata, angulata ; 
umbonibus acutioribus, vie prominentibus ; marginibus dorsa- 
libus postico recto, antico ad angulum parum excurvato, antico 
et ventrali valde et regulariter excurvatis ; parte postica v. 
deatr. subito angulata, v. sinistr. parum sinuata ; nymphis an- 
gustis, elongatis, cartilagine omnino externo: dent. card. mi- 
nimis; dent. lat. v. dextr. antico satis conspicuo, postico obso- 
leto; v. sinistr. nullis ; cicatr. adduct. posticis subrhomboideis, 
anticis valde elongatis, angustis; sinu pallii maximo, subtri- 
angulari, usque ad cicatricem alteram utraque valva porrecta. 
Long. 1°7, lat. 1°2, alt. “68 poll. 
Hab. Panama (teste Rowell, Pease). 
This shell was affiliated by Mr. Hanley to the W. African 7’. 
