PHOTIDAE 



233 



Megamphopus blaisus, n.sp. (Fig. 146). 



Occurrence: 1. St. 123. South Georgia. 3 immat. Jg 5-5-6 mm., 1 $ 6 mm. 



2. St. 140. South Georgia. 2 (?<? 6-5-7 mm -» ' ? 7 mm. 



3. St. 141. South Georgia. 1 immat. <$ 6-5 mm., 1 ovig. $ 7 mm. 



4. St. 144. South Georgia. 2 ?? 6-7 mm., 2 immat. <$<$ 4-5-6 mm., 1 $ 6 mm. 

 Types. 



Description. Antero-lateral angles of head acute, occupied by the well-developed 

 oval eyes. Side-plate 1 slightly produced forwards, but antero-inferior angle rounded; 

 2 larger than the others in <}, longer than deep ; 3 and 4 deeper than long, about as deep 

 as their segments ; 5 with anterior lobe much deeper than posterior lobe. Pleon dorsally 

 smooth ; postero-inferior angle of segment 3 rounded. Telson rounded-triangular, about 

 as broad as long, with two spinules on dorsal surface, each flanked on outside by a seta. 



Fig. 146. Megamphopus blaisus, n.sp. a. Gnathopod 1 j\ b. Gnathopod z<$, with 

 palm and finger further enlarged, c. 2nd joint of peraeopod 3. d. Telson. 



Antenna 1, 3rd joint subequal to ist, flagellum 12-14-jointed, accessory flagellum as 

 long as ist flagellar joint, 1-2-jointed, with a minute terminal joint. Antenna 2 about as 

 long as antenna 1, flagellum 12-jointed. Epistome without spinous projection. Third 

 joint of mandibular palp shorter than 2nd, but not so shortened as in cornutns (Sars, 

 pi. cc). 



Gnathopod 1, 5th joint elongate, lower margin undulate, with oblique marginal rows 

 of long setae, 6th shorter than 5th, ovate, palm shorter than hind margin but undefined 

 except by a slender spine, finger overlapping palm. Gnathopod 2 in the g strongly 

 developed, folded transversely across the body, 2nd joint stout, 5th nearly as long as 

 2nd, with fascicles of long setae on lower margin, 6th shorter than 5th, oblong, lower 

 margin with fascicles of long setae, palm very short, oblique, concave, defined by a 

 strong spine, margin adjoining hinge minutely crenulate, finger overlapping palm ; in 

 ? similar but much feebler and not folded inwards across the body. 



Peraeopods 3-5 increasing in length, 2nd joint pyriform, broadest in peraeopod 3, 

 narrowest in peraeopod 5, anterior margin spinulose, posterior margins feebly notched 

 and spinulose. 



DV 30 



