49 
copicaily laminate, extend backward from near the mouth, on 
each side, to the posterior end of the body, the wider one being 
the inner; between their posterior ends a thin recticu'arly per- 
forate veil connects tie two pairs, and shuts off ihe anal 
area from the rest of the mantle cavity. The intestine con- 
tains a hyaline stylet, and is considerably convoluted; but the 
viscera oifec no marked peculiarities when compared with ordi- 
nary pelecypods. ‘The shells are enclosed in two little sacs in 
the substance of the mantle. The umbones are near together, 
apparently connected by a brown gristle resembling an abor- 
tive ligament, and are nearly over the heart. The valves are 
about 10 mm long, 1 wide, destitute of epidermis, prismatic, or 
pearly lavers. There are no muscular or pallial impressions, no 
adductors, hinge, or teeth. They resemble in form the exterior 
of Gervillia, as heured by Woodward, and are pure white. As 
they lie in the body, they diverge at a rather wide angle from the 
beaks forward. Te embryonic valves are retained like 2 tiny 
bubbles oa the umbones. -The animal forms the type of a new 
family, Chlamydoconchae, and under the classification in the 
new edition of the Ineyciopaedia Britannica, would form a new 
order, Amyaria, fide Dall, from whom the above is mainly com- 
piled. 
INSECTS OF THE WEST. 
The following species have been collected in Riverside and 
San Diego counties, California, principally on the Colorado 
desert, and identified by D. W. Coquillett, with the aid of last- 
ern specialists. Those collected by Dr. Frank E. Blaisdel are 
indicated by BI.: by D. W. Coquiilett, by Cq., by Professor Ed- 
ward Hyatt. by Hy.; all the others by C. R. Orcutt: 
iTYMENOPTERA. 
Two species unidentified. 
Sphaerophthalma 
Elias plumipes Drury. 
