[745] INVERTEBRATE ANIMALS OF VINEYARD souND, Erc. 451 
smaller. The “cloacal fistule” are numerous, and, when living, are 
round and tapering, but when dry become flat and bent, or curved to one 
side. They are mostly 20™" to 40™™ long, and 4™" to 6™™ in diameter 
near the base. 
Several other species of sponges were collected, which have not been 
examined. 
I have been unable to identify any of our specimens with the Spongia 
urceolata of Desor (Proceedings Boston Soc. Nat. History, vol. iii, p. 67). 
Possibly it was based on a peculiarly-shaped young specimen of Micro- 
cionu prolifera. 
FORAMINIFERA. 
Numerous species were collected, especially in the deeper parts of 
Vineyard Sound and off Martha’s Vineyard, but they have not been 
identified. 
ADDENDA. 
Crustacea. 
CANCER BOREALIS Stimpson. (p. 546.) 
A small specimen of this species was dredged off Watch Hill, Rhode 
Island, in 4 to 5 fathoms, among rocks and alge,in April. It was found 
in abundance, and of large size, at Peak’s Island and Pamkin Knob, in 
Casco Bay, Maine, in August, clinging to the sea-weeds, and in tide- 
pools, above low-water mark. 
OcYPODA ARENARIA Say. (Megalops stage.) (p. 337.) 
The megalops of this species was found in large numbers, swimming 
at the surface of Vineyard Sound in September, by Mr. Vinal N. Ed- 
wards. 
Homarus AMERICANUS Edw. (Lobster.) (p. 492.) 
Subsequent observations have shown that the breeding-season of the 
lobster extends over a large part of the year. In Casco Bay female 
lobsters were found carrying eggs in August and September. Mr. Vinal 
N. Edwards has forwarded two living females, of medium size, taken in 
Vineyard Sound, December 12th, both carying an abundance of freshly 
laid eggs. He states that he finds about “ one in twenty” carrying eggs 
at that season. 
THEMISTO, species undetermined. 
A species of this genus was taken in large quantities in Vineyard 
Sound, in September, by Mr. Vinal N. Edwards. It occurred swimming 
at the surface in vast numbers, and was thrown up by the waves in 
windrows, extending several miles along the shores of Martha’s Vine- 
yard. 
