No. 26.] ARTHROSTRACA OF CONNECTICUT. 167 



palm provided with many spines and finely serrated and marked 

 off from the short posterior margin by a stout triangular process ; 

 armed apically with a spine; dactyl strong and curved. Second 

 gnathopods slender; carpus triangular and as wide as, but shorter 

 than, propodus, and abundantly provided with setae; propodus 

 oblong, tapering very slightly to distal end, also provided with 

 dense setae on the margins, palm short, transverse, infero-posterior 

 angle of propodus slightly produced; dactyl very small. Last 

 pair of pereiopods much longer than others, with a long slender 

 dactyl. 



Third abdominal segment with postero-lateral angle produced 

 into a slender curved point above which is a prominent sinus. 



First uropods with peduncle having an upturned spiniform 

 projection beneath the rami which are one-half as long as 

 peduncle ; second pair with no spiniform, projection ; last pair with 

 a single ramus not half as long as peduncle but with peduncle pro- 

 duced into a lobe as large as ramus and lying internal to the 

 ramus. Telson rounded, slightly longer than broad, not extending 

 back quite as far as terminal uropods. 



In life the body is mottled bright crimson, head with a broad 

 median band of crimson which divides in front. The first 

 thoracic segment is more highly colored than the others ; a row 

 of small crimson spots along either side of the mid-dorsal line; 

 bases of both pairs of antennae crowned with orange; flagellum 

 with a double row of crimson spots, a pair to each segment, pro- 

 podus of first gnathopods with crimson blotches. 



Length 15 mm. 



Distribution : Great Egg Harbor, New Jersey ; from Connecti- 

 cut to the Bay of Fundy (Smith); Nova Scotia; Labrador; 

 Greenland ; Spitzbergen ; Norway ; oflf New London, Connecti- 

 cut, taken at 8 fathoms on sandy bottom, July 17, 1874; off Say- 

 brook; Fishers Island Sound; north of Fishers Island; 3>4 to 5 

 fathoms, Aug. 10, 1874. 



The species ranges in depth from low-water mark to 500 

 fathoms. It is an exceedingly abundant species, occurring more 

 abundantly on muddy or sandy bottoms. 



According to Smith (Trans. Conn. Acad., vol. 4, p. 282) these 

 animals do not construct tubes for themselves but are often 

 found in the tubes of other Amphipoda and Annelida. 



