ISOPODS OF NORTH AMERICA. 



351 



FIG. 377. MESIDOTEA SABINI (AFTER MIERS). a, OPERCULAR 

 VALVE (INNER SIDE), x }. 6, HEAD WITH BOTH PAIRS OF ANTEN- 

 NA, x J. 



Localities. Davis Straits; Repulse Bay, North America; Cape 

 Dudley Digges; Cape Faraday; latitude 73 43' north, longitude 78 

 48' west; latitude 71 31' north, longitude 49 12' east; latitude 77 

 14' north, longitude 38 26' east; latitude 71 57' north, longitude 73 

 56' west; latitude 71 42' north, longitude 73 west; latitude 66 33' 

 north, longitude 61 50' west: Julianehaab and Ivsugigsok, Greenland; 

 Cape Smyth, Alaska; 

 Point Barrow, / 



Alaska; Ooglaamie. 

 Alaska; Kara Sea; 

 circumpolar. 



Depth. Surface to 

 76 fathoms, in mud 

 on beach. 



Body narrow, elon- 

 gate, bj,-oad anteri- 

 orly and tapering 

 gradually from the 



middle of the body to the long, pointed terminal segment. Length 

 of body almost four times its greatest breadth, 11 mm. : 40 mm. 

 Length of abdomen almost half the length of entire body, 19 mm. : 

 40 mm. These measurements are from a small specimen. 



Head with the lateral margins cleft, the posterior lobe being much 

 the larger and produced some little distance beyond the anterior lobe. 

 Front deeply excavate between the lateral lobes, with a small median 

 excavation also. Eyes absent. First pair of antenna? 

 with the basal article large, triangular in shape, the 

 broad posterior extremity tapering to a narrow apex 

 at the anterior end; the second article is short, about 

 half as long as the basal article; the third is twice as 

 long as the second; the fourth is a little longer than 

 the third. The first antenna? extend to the third pe- 

 duncular article of the second pair of antenna?. The 

 basal article of the second antenna? is short, not reach- 

 ing beyond the antero-lateral angles; the second article 

 has the exterior margin produced in a rounded expan- 

 sion, and is twice as long as the basal article; the third 

 article is only half as long as the second; the fourth 

 is a little longer than the third, and has a large, round expanded process 

 on the inferior margin and a small expansion on the exterior margin; 

 the fifth article is about twice as long as the third, and is broadly 

 expanded. The flagellum consists of six articles. The second pair of 

 antenna? extend to the middle of the first thoracic segment. The 

 maxilliped has a palp of five articles. 



FIG. 378. MESIDOTEA 

 SABINI. MAXILLI- 

 PED. x Hi. 



