1396.) Proceedings of Scientific Societies. 1067 
Chitons and Limpets are colored so as to more or less resemble the 
speckled and barnacled rocks upon which they occur. A complete 
series of Pholadidea penita (the “ boring clam”) was obtained, which 
shows the gradual atrophy of the foot and concrescence of the mantle 
edges as the adult condition is attained. Specimens of Zirphea cris- 
pata were collected, a related form in which the foot remains functional 
throughout life. A series of maturation and fertilization stages of this 
form was obtained. Lepton is not uncommon, a Lamellibranch that 
lives with commensal attached by its byssus to the abdomen of the 
Crustacean Gebia, and has caused the atrophy of the first pair of ab- 
dominal appendages of its host. It has developed a median furrow on 
each valve in adaptation to the body form of Gebia. An interesting 
case was observed in which an otherwise nearly smooth Placuanomia 
shell had assumed during its growth the concentric raised lines of a 
Saxidomus valve upon which it was attached. 
The insects are not very abundant, they are represented in the col- 
lection mainly by a few wood beetles, myriopods (Julus, Polydesmus), 
and a species of Termes. 
Mr. Calkins reported on the Protozoa and Coelenterates of Puget 
Sound and of the Alaskan Bays. 
The Protozoa and Coelenterates collected during the summer by Mr. 
Calkins belong chiefly to the group Flagellata for the former, and to 
the Leptomeduse for the latter. In addition, there are nine species of 
hydroids—a large number, considering the very limited representation 
of this group in the western waters. Twelve or fourteen species of 
Actinians and about the same number of sponges, and several Scypho- 
medusae complete the list of Coelenterates. 
Mr. Bashford Dean reported on the Chordates and*Protochordates 
of the Collection. The Ascidians are represented by about a dozen 
species, Fishes by upwards of forty. The most important part of his ` 
work had been the collecting of embryos and larve of Chimaera ( Hy- 
drolagus colliei) and a fairly complete series of embryos of Bdellos- 
toma, including upwards of 20 stages from cleavage to hatching. Of 
Chimaera, upward of eighty egg cases had been dredged in a single 
day ; but in every case these were found to be empty. The eggs were 
finally obtained at Pacific Grove, California, from the female, and 
were incubated in submerged cages. It was in this locality that the 
eggs of Bdellostoma were collected. 
C. L. BRISTOL, Secretary. 
