AMPELISCIDAE 



87 



Antenna 1 very short, flagellum 2-3-jointed. Mandibular palp slender, 3rd joint half 

 length of 2nd. 



Peraeopods 3 and 4 with 2nd joint broadly expanded, 5th joint with marginal spines 

 only. Peraeopod 5, 2nd joint distally expanded, marginal setae extending round on to 

 margin facing 3rd joint, 6th linear, dactyl spiniform. 



Branchial lamellae simple. 



Remarks. The genus is instituted on the very strong post-antennal corner of the head, 

 simple branchiae, the very short 1st antennae, and the short flagellum of antenna 2. The 

 side-plates and peraeopod 5 are like those of Byblis, the telson and peraeopods 3 and 4 

 like those of Ampelisca. 



Byblisoides juxtacornis, Brnrd. (Fig. 41). 



Barnard, 193 1, p. 426. 



Occurrence: 1. St. 181. Palmer Archipelago. 1 £ 16 mm., 3 ?? 22 and 27-28 mm. (one of latter 

 ovig.), 4 juv. 11-16 mm. Types. 

 2. St. 186. Palmer Archipelago. 1 immat. (? <$) about 16 mm. 



Fig. 41 . Byblisoides juxtacornis , Brnrd. a. Head with antenna 1 (o ) and 2, and peraeon segments 1-4 with 

 side-plates, b. Antenna 1 $. c. Pleon segments 3 and 4. d. Telson. e. Peraeopod 5 (inner surface). 



Description. Head, peraeon and pleon dorsally rounded. Rostrum obsolete. No 

 corneal lenses ; no ocular pigment (as preserved). Post-antennal angle acute, far forward, 

 almost at the level of the dorsal apex of head, the bases of 2nd antennae consequently 



