366 APPENDIX. 
Spherium (Cyclas) Spokani. (Baird: Nov. Sp.) 
Testa rotundato-ovata, cornea concentrice trans- 
versim conferte minute striata, nitida, sublente obsolete 
punctata; umbonibus rotundatis, obtusis; interne albida; 
margine ventrali rotundato, 
This shell is smaller than the preceding, more 
rounded, and with more obtuse beaks. The striz# or 
riblets are much less distinct; the colour is pale horny 
externally, and white internally. It has a shining 
appearance ; but when examined by the lens, the surface 
is seen to be indistinctly punctate. The specimens 
taken from the Spokan River are much larger than 
those collected in the Kootanie. Long. rather less than 
4 inch; lat. rather more than 4 inch.—Hab. Rivers 
Spokan and Kootanie. (Brit. Mus.) 
TELLINIDZ. 
Tellina nasuta. (Conrad.) Esquimalt Harbour, mud between tide marks. 
Lyonsia saxicola. (Baird: Nov. Sp.) 
Testa ovato-oblonga, medio gibba, tenui, fragili, 
antice producta, clausa, postice compressiuscula, hiante ; 
umbonibus magnis, incurvis; epidermide olivacea, 
striata; margine dorsali rectiusculo, margine ventrali 
flexuoso, hiante. 
This species is the largest of the genus that has yet 
been discovered. It is of an ovate-oblong shape, gib- 
bous in the centre, produced anteriorly, compressed 
posteriorly and gaping. The beaks are large and 
incurved ; it is covered with an olive-coloured epider- 
