i56 



DISCOVERY REPORTS 



Remarks. Although the character of the telson is unknown, the form for which this 

 genus is proposed seems satisfactorily placed in the family Calliopiidae The mouth- 

 parts, side-plates and subsimilar peraeopods fit in well with most of the other genera. 

 There is, however, a certain resemblance to the Pleustids (cf. Parapleustes latipes, Sars, 

 1895, pi. cxxvii) and the long 4th pleon segment recalls Lafystius. 



The name is from the locality, Clarence Island. 



Clarencia chelata, Brnrd. (Fig. 91). 

 Barnard, 193 1, p. 428. 

 Occurrence: St. 170. South Shetlands. 1 immat. about 13 mm. 



Description. Integument not strongly indurated, smooth. No rostrum. No trace 

 of eyes or ocular pigment. Antero-lateral angle of head rounded. Peraeon segments 



Fig. 91. Clarencia chelata, Brnrd. a. General view. b. 3rd peduncular joint and portion of flagellum of 

 antenna 1. c. Lower lip. d. Mandible, e. Maxilla 1. /. Maxilla 2. g. Maxilliped. /;. Gnathopod 1. 



slightly raised on posterior margins, becoming increasingly imbricate posteriorly, seg- 

 ments 6 and 7 ending in a blunt medio-dorsal projection. Side-plates 1-4 moderately 

 deep, 1 subquadrate, slightly produced forwards, 2 and 3 rounded below, 4 with lower 

 angle narrowly rounded, and the oblique posterior margin nearly straight, 5 and 6 with 

 posterior lobes deeper than the anterior lobes. Pleon segments 1-3 carinate, the carina 

 on each segment ending in a sharp tooth ; postero-inferior angles of segments 2 and 3 

 rounded-quadrate ; segment 4 long, with dorsal depression between a slight basal hump 

 and a posterior blunt dorsal ridge. Segments 5 and 6 and telson lost. 



