1T6 NEW UNIONID^, MELANID^, ETC., 



through the shell. There is not in either of the two specimens any deposit under the 

 margin, or any marked line of growth. Mature specimens no doubt would exhibit 

 such marks. In outline it is closely allied to eUiptica, (nobis,) but differs in being 

 smaller, in having a shorter spire, and in being more fragile. The aperture is nearly 

 three-fourths the length of the shell. I have great pleasure in dedicating this to my 

 deceased friend, whose knowledge and love for this branch of natural science was 

 exceeded by few. 



Phtsa hordacea. pi. 24, fig. 102. 



Testa subcylindracea, pellucida, polita, dilute rufa ; spira subelevata, subacuta; suturis subimpressis ; an- 

 fractibus quinis, ultimo grandi et constricto ; labro acuto, margine rufo-lineato ; apertura ovata, 

 superne acute angulata; columella aliquanto impressa et incrassata. 



Shell subcylindrical, somewhat transparent, polished, pale reddish ; spire somewhat 

 raised, rather pointed ; sutures somewhat impressed ; whorls five, the last large and 

 constricted ; outer lip acute, with a reddish line on the margin ; aperture ovate, with 

 an acute angle above ; columella somewhat impressed and slightly thickened. 

 Proc. Acad. Nat. Sci., 1864, p. 116. 



Hob. — Vancouver Island, Oregon, Sir George Simpson. 



My cabinet and cabinet of the Academy of Natural Sciences. 

 Diam. -13 inch. Length -27 inch. 



Remarks. — A number of specimens of this small species were sent to me many 

 years since by Lady Catherine Douglas. It is allied to triticea, (nobis,) from Shasta 

 County, California, but differs in being less inflated, having a higher spire and one 

 more whorl. The color differs in being slightly redder, bordering on the rubiginous, 

 and in the margin of the outer lip the difference is well marked, triticea having a pale 

 rufous line within the margin, while kordacea has a thin dafk rufous line on the 

 margin. They are nearly of the same size. The aperture is about three-fifths the 

 length of the shell. 



-■& 



Phtsa triticea. PL 24, fig. 103. 



Testa subfusiformi, pellucida, polita, rufo-castanea ; spira brevi, subacuta; suturis subimpressis; anfracti- 

 bus quaternis, subconstrictis ; apertura elongata, intus lineata. 



Shell subfusiform, pellucid, shining, reddish-chestnut ; spire short, rather pointed ; 

 sutures slightly impressed ; whorls four, somewhat constricted ; aperture elongate, 

 lined within. 



Proc. Acad. Nat. Sci., 1856, p. 80. ^ 



Hah. — Shasta County, California, Dr. Trask. 



My cabinet and cabinet of Dr. Trask. 

 Diam, -14, ■ Length -27 inch. 



