COROPUIIDJi. 



283 



posterior Rop:mcnts of the plcoii fused together (coaJifa). First pair 

 of giiathopoda having the daetylus longer than the palm of the 

 lUMpodos, and, in the second pair, armed with an acute tooth. Fii-st 

 and second pairs of perciopoda having the dactyla equalling in 

 length the carpi and propoda conjointly. Posterior pair of pleopoda 

 hanng the rami oval. 

 " Length about 4 millim. 



'' Ilah. On the eastern shores of Sweden, from the most northerly 

 point to Bohusia : rare." — BnizeJiiis. 



7. CoropMum affine. 

 Corophiimi affine, Bruzdms, Skand. Amph. Gamm. p. 17. 



" Ccphalon having the anterior margin truncate, scarcely showing a 

 rostnim. Three posterior segments of the pleon not fused together. 

 First pair of gnathopjda ha\ing the dactykxs longer than the palm 

 of the propodos, and, in the second pair, armed with a tooth. 

 First and second pairs of perciopoda having the dactyla longer 

 than the carpi and propoda conjointly. Posterior pair of pleopoda 

 having the rami narrow, nearly linear. 



*' Length about 4 millim. 



" Hah. In the Gulf of Gullmarsfjorden, Bohusia : very rare." — 

 Bruzelius. 



8. Corophinm? quadriceps. (Plate XLVII. fig. 7.) 



Corophium ? quadiiceps, Duna, U. S. Explor. Exjwd. p. 83G. pi. 55. 

 fig. 8. 



" Body depressed, linear ; head quadrate. Pleon posteriorly rounded. 

 Antennae subequal : superior a little the smaller ; flugellum ha\-ing 

 fuur articuli; fii-st joint of the peduncle longest: inferior rather 

 stout, one-fourth as long as the body ; penidtimate joint of the 

 peduncle longest ; the three articuli of the flageilum (juitc short 

 and subequal. Gnat?.opoda similar, the first pair the smaller. 

 Third pair of perciopoda shorter than the second, basos not seti- 

 gerous ; fifth pair long and slender, basos setigerous on its posterior 

 margin, seta) rather long and plumose. 



" Length nearly 1 line. 



" HuIk Harbour of llio Janeiro, near the city; collected December 

 22, 1838."— Z>ana. 



The doubt that is attached to the relation this species holds 

 to the genus is dependent upon the form of the second pair of gna- 

 thopoda. 



