LUTRARIA. 



PLATE V. 



Species 17. (Mus. Cuming.) 



LuTKARiA LANCEOLATA. Lul. testd oblonya, compresfio- 

 jiland, antice angulate atlenuata, lavigatd vel concen- 

 triee tenuismne striata, cardinis deute cochleari- 

 formi, peculiariter angulathn producto, postice incli- 

 nato, sub costd mtenid radiante appresso ; earned, fer- 

 rugineo pallide tinctd, epidermide corned versus mar- 

 ginem indutd. 



The LANCEOLATE LuTRAEiA. Shell compressly flattened, 

 anteriorly angularly attenuated, smooth, or very finely 

 concentrically striated, spoon-shaped tooth of the 

 hinge peculiarly angularly produced, inclined poste- 

 riorly, appressed upon an internal radiating rib ; 

 flesh-tinged, faintly stained with rust, covered to- 

 wards the margin with a horny epidermis. 



Rfsaida lanceolaia. Gray, MS. Mus. Brit. 



Hab. New Zealand ; Earl. 



Distinguished by the spoon-shaped shelf of the hinge 

 Ijeing angularly pressed in the posterior direction upon an 

 internal callous rib, radiating towards the margin. 



Species 18. (Mus. Cuming.) 



Ldtraeia maxima. Lut. testd oblique oblongd, ventri- 

 cosimd, PaHop6eaformi, antice hiante, latere postico 

 brevi, rotundato, antico midto longiore, truncato, con- 

 cenlrice striatd ; albidd, epidermide olivaced corned de- 

 cidud indutd. 



The very large Lutraria. Shell obliquely oblong, 

 very ventricose, Panopaea-shaped, gaping in front, 

 posterior side short, rounded, anterior much the 

 longer, truncated, concentrically striated ; wliitish, 

 covered with an olive, horny, deciduous epidermis. 



MiDDENDOEF, Malacozoologia Kossica, vol. ii. p. 66, pi. 

 19, f. 1-4. 



Hab. St. Juan de Fuoa, Upper California. 



This fine species is well distinguished from the rest of 

 genus by its ventricose Panopaa-like form. The speci- 

 men here figured from Mr. Cuming's collection is of a 

 more elongated form than the typical specimen represented 

 by the Eussian conchologist, but equally ventricose and 

 truncated. In the British Museum are specimens in both 

 states of the species. 



May, 1855. 



