ART. 15 COPEPOD CRUSTACEANS OF CHESAPEAKE BAY WILSON 35 



CLETODES LONGICAUDATUS (Boeck) 



Enhydrosoma longicaudata Boeck, Christiania Videnskebeliger Selskabet For- 



handlinger, p. 54, 1872. 

 Cletodes Jotigicaudatus G. O. Sars, Crustacea of Norway, vol. 5, p. 286, pi. 



197, 1909. 



Occurrence. — About 20 specimens of this copepod were taken in 

 a bottom net at Station R on December 8, 1920, drawn from a depth 

 of 47.5 meters over a bottom of mixed mud and sand. This was 

 the only appearance of the species during the entire survey. 



Remarks. — The copepod first described by Brady and Robertson 

 in 1875 and afterward by Brady alone in his British Copepoda as 

 Cletodes longicaudatus is not identical with the present species, and 

 possibly, as Sars suggests, does not even belong to the same genus. 

 So far as known the species has not before been reported from our 

 American coast. 



CLYTEMNESTRA ROSTRATA (Brady) 



Ooniopsyllus rostratus Brady, Challenger Copepoda, p. 107, pi. 42, figs. 9-16, 



1883. 

 Clytemnestra rostrata Giesbrecht, Fauna uud Flora des Golfes von Neapei, 



vol. 19, pp. 566, 572, pi. 45, figs. 19, 20, 22, 25, 26, 31, 33, 1892. 



Occurrence. — Obtained only at the surface in the ocean outside the 

 bay, where the depths were 118 and 67 fathoms. The combined 

 catches consisted of only a few specimens, including both sexes. 



Remarks. — This copepod nowhere occurs in any abundance : Brady 

 obtained but a single specimen, and Esterly reported one female in 

 summer, but added " occurs also in winter " without specifying the 

 number. Brian and Giesbrecht recorded it as rare in the Mediter- 

 ranean, and it apparently never becomes numerous enough to possess 

 economic value. It is a pelagic copepod and is not likely to be found 

 within the limits of the bay. 



DACTYLOPUSIA BREVICORNIS (Glaus) 



Daotylopus ircvicornis Glaus, Die Copepodenfauna von Nizza, p. 29, pi. 3, figs. 



20-25, 1866. 

 Dactylopusia brevvcornis G. O. Sars, Crustacea of Norway, vol. 5, p. 130, pi. 80, 



1905. 



Occurrence. — Two specimens of this species were obtained at 

 Station W in a surface net on December 7, 1920, and were the only 

 ones found during the survey. 



Remarks. — This tiny harpactid is manifestly a rare species in the 

 bay. Two other species of the genus, more cosmopolitan in their 

 distribution, were obtained by Sharpe at Woods Hole, but the 

 present one has not been hitherto reported from our American 

 shores. It is abundant in the Mediterranean, and Brian has given a 



