MUSEUM OF COMPARATIVE ZOOLOGY. 195 



Family ASTACID-SI. 



Nephropsis occidentalis, sp. nov. 



Pubescent. Carapace cylindrical, the branchial regions convex. Rostrum 

 densely ciliated on the margins, armed with a pair of lateral teeth near the mid- 

 dle ; a double row of prominent granulations on the dorsal surface, diverging 

 posteriorly and continued backward for some distance on the gastric region. 

 A small, blunt papilla in the median line of the gastric area, a pair of acute 

 teeth near the anterior margin at the base of the rostrum, and another pair just 

 above the insertion of the second pair of antennae ; a small papilla in the 

 median line on the intestinal region. Abdominal pleurae rather longer-pointed 

 than in N. stewarti, but not so much so as in N. agassizii and N. atlantica; 

 their anterior borders are finely denticulated, but are destitute of spinous pro- 

 cesses. Telson armed with a sharp spine in the median dorsal line, near the 

 proximal end. 



Length, 119 mm. ; carapace, 51 mm. ; rostrum, 14 mm. ; second antenna, 

 225 mm. 



Station 3418. 660 fathoms. 23 males, 32 females. 

 " 3424. 676 " 2 males. 



Family ERYONTID^I. 



Willemoesia inornata, sp. nov. 



Similar to W. leptodactyla, but readily distinguished from it by the small 

 number of spines on the margin and dorsal ridges of the carapace. The 

 armature may be formulated thus : — 



Marginal 5 to 8 — 2 to 3 — to 6 



Median ridge 1 to 5 — 



The marginal spines which lie behind the cervical groove, if found at all, are 

 but rudimentary, while there are no spines on the submarginal carina or along 

 the lateral boundaries of the cardiac area, where they are present in W. lepto- 

 dactyla. The third maxilliped bears only a slender epipod ; the membrane 

 that connects this limb with the body carries a small, but perfectly formed 

 gill (arthrobranchia). According to Spence Bate, this gill is absent in 

 W. leptodactyla. 

 Station 3374. 1823 fathoms. 8 males, 6 females. 



" 3381. 1772 " 1 male, 1 female ovig. 



" 3382. 1793 " 2 males, 4 females (1 ovig.). 



" 3399. 1740 " 2 males, 1 female. 



" 3400. 1322 " 1 female. 



VOL. XXIV. —NO. 7. 4 



