476 



BULLETIN OF THE BUREAU OF FISHERIES. 



Pontoporeia femorata. After Sars. 

 ubf. Dorsal side of fourth abdominal 

 segment. 



Color white; eyes black. The yellow or orange gonads may often be seen through the integu- 

 ment. Sometimes specimens are of a yellowish color. 

 Length, 6 mm. Type No. 29246, U. S. Nat. Mus. 



Found commonly in the mud in the Eel Pond at Woods Hole. Specimens were also taken off 

 Nobska. 



This species has the habit of lying very quiet for a lung time with its body strongly flexed. When 

 disturbed it starts quickly and swims vigorously for a time and then conies to a very sudden stop with 



its body flexed and lies quiet as before. Unlike most amphipods it 

 p is little affected by light, but contact with a solid body causes it 



n-| quickly to stop when swimming and lie still. It has a strong pro- 



pensity to get under any object it meets. Individuals coming in con- 

 tact often try to get under each other. 



Pontoporeia femorata Kri'iyer. 



Eyes reniform, red in life; first antennae about as long as the 

 second; first peduncular joint a little longer than the next two; fla- 

 gellum shorter than peduncle; secondary flagellum minute, two- 

 jointed; flagellum of second antennae a little shorter than peduncle; 

 first four coxal plates of nearly equal depth, setose below, a small 

 tooth on the postero-inferior angle of the first three; carpus of first 

 guathopods very broad, projecting in front of propodus, and fur- 

 nished with a broad, setose lobe behind; propodus broadly subova'te, 

 the posterior margin bulging outward near the base; second guatho- 

 pods with propodus narrow, a little shorter than carpus; postero- 

 inferior angle produced so that the hand is almost chelate; last pair of perseopods with basal joint 

 very broad, rounded ami strongly setose behind and longer than rest of appendage; fourth abdominal 

 segment with a prominent bifurcated spinous projection in mid-dorsal line; telson somewhat longer 

 than broad and cleft to beyond the middle. 

 Length, 14 mm. 



Circumpolar; Norway (Sars); Greenland; Labrador. 

 I have found several specimens of this species in the collec- 

 tion of the Boston Society of Natural History, but they had no 

 label giving their locality. It is probable that, like most of the 

 other specimens in the collection, they came from somewhere on 

 the New England coast. 



Haustorius arenarius (Slabber). 



Lepidactylus diiyscus Say, Jour. Acad. N":it. Sci. Phila.. Vol. I, ISIS, p. 380. 



Head with a short, triangular rostrum; eyes small, nearly 

 round; both pairs of antenna- short; peduncle of first pair with 

 numerous plumose seta'; secondary flagellum over half as long as 

 primary; last two joints of peduncle of second antennae compressed 

 and much dilated, the lower margins fringed with long, plumose 

 setse; penultimate joint several times larger than the last one and produced into a rounded lobe at 

 antero-inferior angle; flagellum not exceeding peduncle; first four coxal plates increasing success- 

 ively in size, the first three concave behind, strongly convex in front and tapering below to a rather 

 obtuse point; fourth coxal plate larger than the others, concave behind, strongly convex in front 

 and broadly rounded below; guathopods rather small, carpus widened at middle, larger than pro- 

 podus, which is very thickly setose and bears a small terminal dactyl which is much reduced in the 

 second gnathopods; first two pairs of perceopods similar, carpus much dilated, being produced into 

 a very large, rounded posterior lobe, which is furnished on the margin with several spines; propodus 

 more or less pyriform, flattened, constricted toward the base, the rounded extremity armed with 

 several spines; third perseopods with basal joint, merus and carpus much dilated, propodus narrow; 

 fourth perseopods much larger than third, with the same joints dilated, the small and narrow 



Haustorius arenarius. Off Martinis Vine- 

 yard 



