ISOPODS OF NORTH AMERICA. 



351 



Fic. 377.— Mesidotp;a sabi.ni (After Miers). «, OPKRcrLAR 



VALVE (INNER SIDE). X |. h. HEAD WITH BOTH PAIRS OF AXTEN- 

 N.E. < i. 



Localities. — Davis Straits; Repulse Bay. North Aiiieriea; Cape 

 Dudley Dio-o-es; Cape Faraday; latitude T;^> 4:!' north, lonoitude 78" 

 48' west; latitude 71" 31' north, lono-itude 4!» 12' east; latitude 77" 

 14' north, lonoitudc 38" 2H' cast; latitude 71 57' north, lonoitiide 73" 

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

 north, long-itude 61" 50' west: Julianehaah and Ivsuo-iu-.sok. Greenland; 

 Cape Smyth, Alaska; 

 Point Barrow, f\ 



Alaska; Ooglaamie, 

 Alaska; Kara Sea; 

 circumpolar. 



Depth . — Surface to 

 76 fathoms, in mud 

 on beach. 



Body narrow, elon- 

 gate, broad anteri- 

 orly and tapering 

 gradualh' from the 



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

 of body almost four times its greatest breadth, 11 mm. : 4n mm. 

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

 40 nnn. 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 l)asal 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 antennae extend to the third pe- 

 duncular article of the second pair of anteima'. The 

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

 itig 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 onlv 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 broadh^ 

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

 antennfB extend to the middle of the first thoracic segment. The 

 maxilliped has a palp of five aiticles. 



Fig. 378.— M ESI dote a 

 SABINI. Maxilli- 

 ped. X Hi. 



