AMPHIPODA OF SOUTHERN NEW ENGLAND. 517 



thin margin of palm finely pectinated; dactyl armed within with about six short, < .1 >li<in<_" spines; first 

 two perseopods with basal joints narrow and elongated; ischium longer than broad, carpus narrower 

 than merus and slightly tapering toward either end; dactyl slender, a little over half the length of 

 propodus; third perseopods short, fourth much longer, last pair very long and slender; postero-lateral 

 angles of first three abdominal segments rounded and not. produced; first uropods narrow, rami sub- 

 equal to peduncle in length, latter with a long, narrow spine projecting from distal end below rami; 

 rami of second uropods a little longer than peduncle, the latter furnished as in first pair with a long 

 spine at distal end, which extends to about half the length of rami; rami of third uropods subequal 

 and nearly twice the length of peduncle, which is devoid of a terminal spine; telson wider than long, 

 distally rounded. 



Body and coxal plates with blackish pigment, the fifth thoracic segment lighter than the others: 

 abdomen lighter than thorax; legs transparent and almost devoid of pigment; body and appendages 

 with a diffuse reddish-brown coloration, which is deeper on the large hand, becoming more intense 

 toward the tip and on the base of the dactyl; dorsal side of body crossed with purple, orange, or rose- 

 colored bars; both pairs of antenna' very beautifully and conspicuously marked with spots of red, 

 pink, or orange, these spots on the peduncles of both antenna- at the basesof thesetie, on the flagellum 

 of first antennae; they are regularly arranged, a pair of oblong spots being separated by a colorless 

 longitudinal interval on each joint. Eyes black. 



Length, 6 mm. 



Vineyard Sound (Smith) "in tubes in masses .if a compound ascidian ( Amour wcium pellucidum 

 Verrill ) in 3 to 8 fathoms." 



Cerapus tabularis Say. 



Head with a small rostrum and a faint dorsal carina; first and second antenna' subequal in length, 

 and in the male a little over half the length of body; first segment of first antennas stout, laterally 

 compressed, furnished below with a 

 carina which is more prominent near 

 the base; second and third segments 

 subequal; Hagellum three-jointed 

 and about as long as last joint of 

 peduncle; second antenna- with fla- 

 gellum three-jointed and nearly as 

 long as last peduncular segment; 



coxal plates broader than deep: first 



, . . , ' , Cerapus tubularis. After Smith. 



gnathopods with carpus produced 



downward at postero-distal angle into a small lobe; propodus oblong, narrower than carpus but 



about as long; palm oblique, spinulous; second gnathopods in male with carpus furnished at its 



postero-inferior angle with a large, acute tooth, above which is a rounded sinus separating the latter 



from a small rounded tooth; propodus oblong, slightly incurved, nearly as long as carpus, inner margin 



irregular; dactyl large and stout; second gnathopods in female similar to first pair; third perseopods 



very small; merus with a long spatulate lobe on posterior margin; carpus articulated to posterior 



margin of merus above distal end of latter, and produced greatly beyond articulation of oblong 



propodus; dactyl short and broad with an abruptly recurved hook-like tip; second uropods small, 



about as large as outer ramus of first pair, ramus very short and furnished with a terminal hook; 



terminal uropods much like preceding pair but stouter; telson twice as broad as long, distally 



emarginate, the two lobes rounded and armed above with minute hooks. 



Length, 4.4 mm. 



Great Egg Harbor, New Jersey (Say); Vineyard Sound, in masses of the compound tunicate 

 Amouroucium pellucidum, ami in Noank Harbor, Connecticut (Smith). 



This species has the peculiar habit of carrying the tubes in which it dwells, unlike most of the 

 tube-dwelling amphipods which live in a fixed abode. A full description of the structure of this 

 interesting species and several observations on its habits is given by Professor Smith. (Trans. Conn. 

 Ac. Arts and Sci., vol. 4, pp. 269-277, pi. 2, figs. 1-6.) 



