COROPHIIDAE 24s 



Colour (as preserved), pale, with a grey band across top of head between eyes, and a 

 grey band across each segment, eyes black. 



Distribution. East coast of North America; Falkland Islands. 



Genus Cerapus, Say. 

 Stebbing, 1906, pp. 665, 740; 1910, p. 616. 



Cerapus oppositus, n.sp. (Fig. 153). 



Occurrence: 1. St. 190. Palmer Archipelago (90-130 m.). 1 ovig. 9 3 mm., with tube. 



2. St. MS 71. South Georgia. 3 6*6* 2-5 mm., 3 $? 2 mm., with tubes. Types. 



Description. Closely resembling crassicornis (cf. Sars, pi. ccxvii). Rostrum pro- 

 jecting only a little distance beyond the level of the 

 acute antero-lateral angles of head. Antennae 1 and 

 2, flagellum in both sexes 2-jointed. 



Gnathopods 1 and 2 in $, and gnathopod 1 in 6* 

 as figured by Sars. Gnathopod 2 in $, 5th joint 

 shorter and more triangular in shape, without tooth 

 on lower margin, 6th notched near base on lower 



Fig. 153. Cerapus oppositus, n.sp. 



margin, finger shorter than 6th. Gnathopod z$. 



Peraeopods 1-5 as figured by Sars, but 2nd joint 

 in peraeopod 1 broadly oval, and dactyls of peraeopods 1 and 2, especially the latter, 

 shorter. 



The tubes are of a leathery texture, without sand grains, cylindrical and open at 

 both ends. 



Genus Pseuderichthonius, Schell. 

 Schellenberg, 1926, p. 385. 



Pseuderichthonius gaussi, Schell. 



Schellenberg, 1926, p. 385, fig. 66. 



Occurrence: 1. St. 170. South Shetlands. 1 $ 16 mm. 



2. St. 175. South Shetlands. 1 immat. $ 14 mm., 1 $ (anterior half only). 



Remarks. Except in size, I see no differences between these specimens and Schellen- 

 berg's description and figures. 



Antenna 1, 3rd joint longer than 1st and almost as long as 2nd, flagellum about equal 

 to 2nd and 3rd peduncular joints together, about 16-jointed, peduncle and flagellum 

 with long setae, no accessory flagellum. Antenna 2, flagellum 18-jointed. Inner lobe of 

 maxilla 1 with seven setae. 



Gnathopods 1 and 2, palm defined by a spine, and hind margin slightly convex. The 

 long setae bordering the palm are very definitely grouped in slightly oblique rows; 

 those on the anterior margin of the hand also are arranged in transverse rows and are far 

 more abundant on gnathopod 1 than on gnathopod 2. The inner surface of 5th and 6th 

 joints, especially in gnathopod 1 , bear a number of long setae arranged in transverse rows. 



