172 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



south side, fine sand, low water, Sept. 15, 1963: 40 99; North 

 Fahnouth, Herring Brook, fine sand at mouth, low water: 1 imm.; 

 off Nashawena Island, Quick's Hole, sand, 45 ft. grab, Sept. 18, 1963: 

 2 imm. (MBL, author collections). 



Northern New England, 1963: more than 700 specimens obtained 

 at 8 suitable collecting stations from East Sandwich, Mass., north 

 to Saco Bay and Hermit Island, Maine; additional 200 specimens 

 collected at Gosses Cocques and Salmon River beaches near the 

 mouth of St. Mary Bay, western Nova Scotia (NMC, author 

 collections) . 



Remarks. — Material from Woods Hole differs somewhat from 

 the type material of Shoemaker (1949) from East Quoddy, Maine, 

 in having a more pronounced and sharply undercut posterior basal 

 lobe in peraeopod 5. Also, the dorsal spines of urosome 1 are more 

 numerous, especially in the male. The male (penultimate stage) 

 surprisingly is little different from the female. Antennal flagella 

 are somewhat longer, 5-6 segmented, calceolate in antenna 2. Basal 

 peduncular segment of antenna 1 is without the protuberance on 

 the under surface. Pleon side plate 3 is wealdy mucronate behind, 

 but the posterior margin is more broadly convex. 



The large peduncular first segment of left and right antenna 1 are 

 approximated closely and taper distally to form a pseudorostrum, 

 shielding the distal portion of the antenna much as in the Phoxo- 

 cephalidae. 



Subfamily HaustoriLnae 

 Protohaustorius, new genus 



Head normal, broadening somewhat posteriori}^; rostrum short, 

 antennal sinus shallow. Body relatively slender, lateral lobes of 

 peraeon very short. Pleosome narrowing gradually behind peraeon 

 7, hindmargin slightly decurved but not reflexed nor overhanging 

 side plates, rounded behind urosome. Urosome strong, with well- 

 developed postero ventral lappet on segment 1, urosome 2 short, 

 narrow. Antenna 1 semigeniculate, peduncular segment 1 enlarged, 

 closely approximating its mate (as in Bathyporeia) , segments 2 and 3 

 slender; flagellum calceolate in both sexes, accessory flagellum 2- 

 segmented. Antenna 2, peduncular segments 4 and 5 elongate, 

 4 weakly lob ate behind. 



Upper lip apically rounded. Lower lip: inner lobes simple, distally 

 rounded. Mandible: incisor and lacinia unicuspate, accessory blades 

 few, palp large, comb row short. Maxilla 1: palp short, plumose; 

 accessory lobe vestigial. Maxilla 2: outer plate small. Maxilliped: 

 plates short, palp segment 3 not geniculate. 



