PHOXOCEPHALIDAE 



99 



side-plate is an outstanding feature. A tendency in this direction is seen in the genus 

 Harpinia, with which genus the present form has in common the narrow 2nd joint of 

 peraeopod 3. In other respects, however, it is a Phoxocephalus . 



Types. 



Genus Harpinia, Boeck. 

 Stebbing, 1906, pp. 140, 723. 

 Stephensen, 1925, p. 163. 



Harpinia cariniceps, n.sp. (Fig. 49). 



Occurrence: 1. St. 162. South Orkneys. 1 juv. 9 mm. 



2. St. 167. South Orkneys. 30 ?$ 12-17 mm., 6 ovig. $$ 17-18 mm. 



3. St. 181. Palmer Archipelago. 5 $9 (3 ovig.) 17-18 mm. 



4. St. 186. Palmer Archipelago. 1 $ 18 mm. 



5. St. 195. South Shetlands. 4 juv. 8-10 mm. 



Description ?. Body glabrous. Head acute in front, sharply keeled dorsally. Side- 

 plate 4 as mplumosa (Sars, 1 895 , pi. Hi), 5th 

 with posterior lobe a little deeper than in 

 that species. Postero-inferior angle of pleon 

 segment 3 produced in a strong, slightly 

 upturned process as in plumosa or obtusifrons 

 (Stebbing, 1888, pi. lvi), no oblique row of 

 setae on surface. Segment 4 with gently 

 convex dorsal profile beyond the basal 

 depression. Telson, lobes parallel-sided, 

 apically broadly rounded. 



Antenna 1, flagellum 10- 11 -jointed, ac- 

 cessory flagellum 7-8-jointed. Antenna 2, 

 basal joint with a large curved ensiform pro- 

 cess, apically subacute, as in obtusifrons, 4th 

 joint triangularly expanded, outer surface 

 with an oblique row of spine setae, the upper 

 ones simple, the lower plumose, upper apex 

 with several long simple setae , lower margin 

 with long plumose setae, and a submarginal row of simple spine setae, flagellum 

 12-jointed. 



Peraeopod 4 like that of obtusifrons, but 2nd joint twice as long as broad, upper hind 

 angle rather prominent, hind margin concave. Peraeopod 5, 2nd joint like that of 

 obtusifrons, 3rd distally lobed anteriorly, 4th distally lobed posteriorly. 



Remarks. A species allied to plumosa, but more especially it may seem to obtusifrons. 

 The ensiform projection on antenna 2 appears to arise from the 2nd joint and to re- 

 present the antennal cone, though both Stebbing and Sars consider that it arises from 

 the 1st joint. If it were the 2nd joint, then the large triangular joint becomes the 5th 

 joint of the peduncle, and the following abruptly smaller joint the 1st joint of the 



13-2 



Fig. 49. Harpinia cariniceps, n.sp. a. Antenna 2. 

 b. Peraeopod 5, with inner surface of 2nd and 3rd 

 joints drawn separately. 



