240 Proceedings of the Royal Physical Society. 
I have taken this opportunity to give a brief notice of 
these recent investigations and discoveries, as they are un- 
questionably the most valuable additions to our knowledge 
of the SpongiadcB, since the original contributions of Dr 
Kobert Grant, published in the " Edinburgh Philosophical 
Journal "for 1826. 
III. Report of the Committee on Marine Zoology ; with a Notice of the 
Sprat-Fishing in the Firth of Forth. By Geoege Logan, Esq., Con- 
vener. (With exhibition of specimens). 
Mr George Logan, W.S., the Convener, read the report 
of the proceedings of the Committee on Marine Zoology for 
the past year. The Committee, among numerous other cap- 
tures, obtained a fine specimen of Corystes cassivelawius, the 
masked crab, dredged up in Aberlady Bay. Living speci- 
mens of Kellia suborbicularts, found plentifully in dead 
valves of Tapes virginea, near Inchkeith, in September last, 
lived for rather more than six weeks. Although great num- 
bers of the hermit crab, Pagurus, were examined, dredged 
in about six fathoms water, in expectation of finding the 
parasite Peltogaster paguri frequently attached to it, not a 
single specimen was discovered. Sacculina carcini was 
found at Trinity attached to the abdomen of the com- 
mon edible crab, sometimes two or three on one animal. 
To show how very little particular the hermit or soldier 
crabs are in the choice of their residence, one was dredged 
up near Inchkeith ensconced in the large head of an 
ancient-looking tobacco pipe, covered with barnacles. One 
specimen of Psammohia Ferroensis was found near Inch- 
keith ; and occasionally on old valves were observed the 
curious pear shapes, stalked ovarian niduses, of Pontohdella 
muricata, frequently passed over as the undeveloped state 
of Himanthalea lorea ; some specimens were also procured 
of Nemertes Borlassii, of a beautiful full dark purple colour, 
and of enormous length. On the 28th of September four or 
five specimens of a small flat fish came up in the dredge, 
which appears to be the Monochirus linguatulus (Cuvier), 
first observed in this country by Parnell on the Devonshire 
coast, and noticed by him in 1837 in the Transactions of the 
