366 APPENDIX. 



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Sphcerium (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 ventral! rotundato. 



This shell is smaller than the preceding, more 

 rounded, and with more obtuse beaks. The strise 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 Eiver are much larger than 

 those collected in the Kootanie. Lono-. rather less than 



o 



i inch ; lat. rather more than 1 inch. Hob. Kivers 

 Spokan and Kootanie. (Brit. Mus.} 



TELLINID.E. 



Tellina nasuta. (Conrad.) Esquimalt Harbour, mud between tide marks. 



Lyonsia saxicola. (Baird : Nov. Sp.) 



Testa ovato-oblonga, medio gibba, tenui, fragili, 

 antice products., clausa, postice compressiuscula, hiante ; 

 umbonibus magnis, incurvis ; epidermide olivacea, 

 striata ; margine dorsal! 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- 



