NO. 1222. ISOPODS OF THE ATLANTIC COAST— RICHARDSON. 549 



four on either side of the median line. The terminal segment has 

 one median row of spines and a row on either side of this and a 

 lateral row. The median row consists of five small spines and one 

 large terminal spine. The dorsal row on either side of the mc^lian 

 row each consists of four spines. The outer marginal latei'al rows 

 each consi.sts of three spines. Tlie opercular valves l)ear eac-h a 

 longitudinal row of eight spines. 



l>oth the anterior and the posterior pairs of legs aro cover(Ml with 

 spines, the anterior ones more densely. 



Two specimens, one imperfect, were obtained by the U. S. Fish 

 Commission steamer AlhatrosSj at Fernandina, Florida. 



Ti/pe.— Cat. No. 11522, U.S.N.M. 



117. ARCTURUS BAFFINI (Sabine). 



Idofea baffini S.\bine, Suppl. to App. to Ca})!. Parry's Voyage, 1S24, p. 228, 

 pi. 1, figs. 4-6. 



Arcturus bqftinl Milne-Edwards, Hist. Nat. Crust., Ill, p. 123, pi. xxxi, fig. 1. — 

 G. 0. Sars, Den Norske Nordhavs-Exped., Zool., Crust., I, p. 97, -pi. ix, 

 figs. 1-21.— Hansen, Vid. Medd. uaturh. Foren. i Kjoebh., 1887, p. 188.— 

 Axel Ohlin, Bidrag till Kannedomen cm Malakostrakfaunan i Baffin Bay 

 och Smith Sound, LS95, pp. 15-18. 



TraUtat.—m° 35' N. lat., 54° 50' W. long.; m'' 32' N. lat., 55° 34' 

 VV. long.; 67° 50' N. lat., 56° 33' W. long.; 68° 9' N. lat., 56° 32' W. 

 long.; T0°.21' N. lat., 55° 40' W. long.; 71° 10' N. lat., 58° 50' AV. 

 long.; 78° 24' N. lat., 74° W. long.; Inglefield Gulf; Murchison 

 Sound; Cape Fafada}^; 72° 38' N. lat., 77° 10' W. long.; 72° 8' N. 

 lat., 74° 20' W. long. 



Depth.— ^ to 150 fathoms. 



118. ARCTURUS FEILDENI Miers. 



Arcturus baffini var. frihleni Miers, Ann. Mag. Nat. Hist. (4) , XX, 1877, p. 64. 

 Arcturus feildenl Benedict, Proc. Biol. Soc. Wash., XII, 1898, p. 44. 



Ilalntat. — Camp Clay, Cape Sabine; Davis Straits; off Churchill, 

 Hudson Bay. 



Deptli.—m fathoms. 



48. ASTACILLA Fleming. 



analytical key to the species of ASTACILLA. 



'/. "With eyes. Head excavate in front without rostriform point. Fourth thoracic 

 segment subcylindrical. Terminal abdominal segment with a prominent, sub- 

 acute tooth on each side, above the middle, directed outward and backward; 



extremity obtuse. 119. AstaciUa grannlaia (G. O. Sars). 



f/. Without eyes. Head with a rostriform point in front, between the autennulae. 

 Fourth thoracic segment wider at the anterior end, and tapering to the 

 posterior end. Terminal ahdoniinal segment with a pair of teeth on each 

 side; extremity acute 120. Astacilla aeca Benedict. 



