INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 745 



smaller. The "cloacal fistulge" 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. ^Xat. History, vol. iii, p. 67). 



Possibly it was based on a peculiarly-shaped young specimen of Micro- 



ciona 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, Ehode 

 Island, in 4 to 5 fathoms, among rocks and algse, in April. It was found 

 in abundance, and of large size, at Peak's Island and Pumkin Knob, in 

 Casco Bay, Maine, in August, clinging to the sea-weeds, and in tide- 

 pools, above low-water mark. 



Ogypoda 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 AiLERiCANUS 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 ware 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, sioecies 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. 



