[745] INVERTKI'.KATI' ANIMALS OF VIXK Y A I.'I > SOUND, IK. 461 



smaller. The "cloacal tistuhe" are numerous, and, when living, are 

 round and tapering, but when dry become Mat and bent , or carved t., one 



side, They are mostly 20 mm to 40 mm loug, and -I""" to <; 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 onr specimens with the ,s/,o//vm 

 urccolata of Desor (Proceedings Boston Soc. Nat. History, vol. iii, j. 

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

 dona prolif era. 



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 alga3, in April. It was found 

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

 Cnsco 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 iu September, by Mr. Viual N. Ed- 

 wards. 



HOMARUS AMERIOANUS Edw. (Lobster.) (p. 492.) 



Subsequent observations have shown that the breeding- season of the 

 lobster extends over a large part of the year. In Oasco 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 carving an abundance of freshly 

 laid eggs. He states that he finds about " one in twenty " carrying eggs 

 at that season. 



THEMTSTO, 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. 



