LYSIANASSIDAE 



63 



ending on segment 3 in a triangular tooth-like projection; segment 4 with a strong 

 slender upstanding tooth; segment 5, very short; postero-inferior angles of segments 

 1-3 rounded. Segments 1-3 each have a lateral prominence which is rather indefinite, 

 the most projecting part being in line with the prominences on peraeon segments 5-7. 

 Telson twice as long as basal width, cleft to base, lobes tapering to acute apices, each 

 with a terminal spinule. 



Antenna 1, peduncle stout but not carinate, the 1st and 2nd joints scabrous, 3rd very 

 short, flagellum 6-jointed, 1st joint large, with regular brush of plumose setae along 

 lower margin, 2nd-6th joints much smaller, accessory flagellum 2-jointed, as long as 

 1st flagellar joint, 1st joint long, 2nd very short. Antenna 2 slender, 4th and 5th joints 

 subequal, flagellum 7-jointed. 



Fig. 24. Lepidepecreoides xenopus, Brnrd. a. General view, integumentary sculpture indicated on head and 

 peraeopod 4. b. Profile of epistome and upper lip. c. Gnathopod 1. d. Gnathopod 2. e. 2nd joint of 

 peraeopod 3 of juvenile (St. WS 33). 



Epistome straight in profile, not expanded; upper lip considerably gibbous. Mouth- 

 parts as in Lepidepecreopsis (Stephensen, 1925, p. 120, fig. 33). Lower lip with lobes 

 apically rounded as in Lepidepecreum. Spines on apex of outer plate of maxilla 1 very 

 stout; inner plate with two setae. The short stout spines on apex of palp of maxilla 1 and 

 on inner margin of outer plate of maxilliped very regular, as in Stephensen 's figures. 



Gnathopod 1 moderately slender ; 6th joint about two-thirds length (upper margin) 

 of 5th, widening slightly to the oblique palm, a spine at the defining angle, finger over- 

 lapping palm. Gnathopod 2, 6th joint ovoid, broader than in any of the allied genera, 

 palm convex, slightly projecting, but not chelate, finger overlapping palm. 



Peraeopods 1 and 2 armed with a few rather long outstanding setae, dactyl elongate, 

 two-thirds length of 6th joint (cf. Lepidepecreopsis). Peraeopod 3, 2nd joint remarkably 

 thick, quadrangular, angularly expanded on both anterior and posterior margins, the 



