HIGHER CRUSTACEA OF NEW YORK CITY 1 67 



All the members of this family inhabit tubes, usually of their own 

 construction, and, together with the preceding family, belong to the 

 old division Domicola. 



Corophium cylindricum (Say) 



Podocerus cylindricus Say, T. /. c. 1818. 1:387. (Not of Bate. 

 Cat. Amp. Crust. Brit. Mus. 1862. p.256) 



Corophium cylindricum Verrill. /. c. 1874. p. 566. 



Antennulae, relatively to> the antennae rather small, with flagel- 

 lum slender and without secondary flagellum. Antennae of male 

 with penultimate joint of peduncle greatly enlarged and with sharp 

 tooth at distal end. Ultimate joint shorter, flagellum of two joints. 

 Gnathopoda feeble, very similar in both sexes. 



Fig. 37 Corophium cylindricum 



This species inhabits soft tubes which are found in great numbers 

 in sponges, algae etc. They can easily be obtained by pulling apart 

 the pieces of the red sponge, Microciona prolifera, cast 

 up on the beach. 



Length 5 mm. Color light, mottled with gray. 



Found all along the shore. 



3 CAPRELLIDEA 

 An aberrant tribe which differs from the typical Amphipoda in 

 the form of the body, which is either depressed or cylindric, and 

 in the abdomen, which is rudimentary. It is divided into two fam- 

 ilies, 1, Caprellidae, cylindric forms, and 2, Cyamidae, or whale lice, 

 which have a flat body. Specimens of the first family only have 

 been taken. 



