-±80 



BULLETIN OF THE BUREAU OF FISHERIES. 



e P, 





in that the first pair oi coxal plates project a little farther forward, the dactyl of the last pair of 

 pi-i.iMip, ,ils is as long as, or a little longer than, the propodus, and the dactyls of the first and second 



peraeopods are a little larger. At first I was inclined to regard the W Is Hole forms as constituting 



a species distinct from, but very closely allied to macrocephala, but a comparison of them with 

 specimens taken at various places along the coast farther north led me to consider them as not specifi- 

 cally distinct. The specimens from north of Cape Cod present gradations between those found at 

 Woods Hole and the forms figured by Sars, so that none of the differences enumerated are constant. 



Ampelisca spinipes Boeck. 



First antenna' of female a little longer than peduncle of second pair; second antenna- less than 

 half the length of body; last two joints of peduncle of subequal length. First antennae in the male 

 very much longer than in the female, being over one-third the length of body; second pair exceeding 



length of body and with last joint 

 of peduncle much longer than pre- 

 ceding one; propodus of first gnath- 

 opods nearly as long as carpus and 

 somewhat bulging on proximal por- 

 tion of posterior margin; second 

 gnat In i] i< ids slender, the narrow car- 

 pus nearly twice as long as the pro- 

 podus; dactyl of first and second 

 peraeopods about as long as two pre- 

 ceding joints combined; last pair of 

 peraeopods with ischium nearly twice 

 as long as wide, much longer than 

 the nearly square merus; carpus sub- 

 rectangular, elongated; propodus 

 longer than carpus or dactyl; pos- 

 tero-lateral angle of third abdomi- 

 nal segment not produced, and form- 

 ing nearly a right angle; fourth ab- 

 dominal segment of the male with a 

 prominent dorsal carina which ends 

 abruptly posteriorly; the following 

 segment deeply indented above; the 

 corresponding features of the female 

 are much less pronounced; no long terminal spine on outer ramus of penultimate uropods; terminal 

 uropods thickly setose in the male but nearly devoid of setae in the female. 



General color, whitish; a rose-colored or light-purplish spot in the first coxal plate; a few other 

 spots of the same color may occur on other parts of the body. 

 Length, 14 mm. 



W Is Hole; Long Island Sound; Newport; Norway (Sars); France. 



The male differs from the female in having longer second antenna-, with the terminal joint of the 

 peduncle relatively longer, the last basal joint being only a little longer than the preceding one in 

 the female; in having the lower side of the peduncle of the first antenna- and the upper side of 

 the peduncle of the second furnished with numerous tufts of short seta-; in having the fourth 

 abdominal segment with a deeper depression on the proximal portion of the upper side and a more 

 prominent dorsal carina, and in having the terminal uropods more strongly ciliated. 



Ampelisca compressa Holmes, new species. 



Body strongly compressed and generally strongly Hexed; head markedly shorter than first three 

 segments of thorax; tirst antenna- shorter than peduncle of second pair; third joint of peduncle a little 

 shorter than tirst; tlagellum only a little longer than peduncle, second antennae slender, over half 

 length of body in female, and much longer than body in adult male; peduncle in male over a third 

 length of body, last joint a little shorter than preceding one; first four coxa I plates higher than their 



Avtpt I /.-a i spinipt s, female. 



Near W uuils Hole. Muss. 

 abdominal segment. 



epg, Side plate of third 



