8o DISCOVERY REPORTS 



The genus Heteronymphon serves to link the Nymphonidae to the Phoxichilidae 

 (Pallenidae) on the one hand and to the PhoxichiHdiidae on the other. In the former 

 family the terminal claw of the oviger is sometimes wanting or vestigial ; in the latter 

 family the ocular tubercle is situated near the anterior border of the cephalon in, e.g., 

 Phoxichilidium mistrale. 



Loman (1908, table facing p. 19) uses the oviger as a basis for his first division of the 

 order Pantopoda. Bouvier (191 3, p. 34) has pointed out that this division into a section 

 with and a section without a terminal claw to the oviger is not altogether satisfactory. 

 The genus Heteronymphon adds yet another exception to the first section, since the 

 terminal claw of the oviger is absent and several of the terminal denticulate spines are 

 enlarged, presumably to take the place of the claw (Fig. 39 d). 



Heteronymphon kempi, n.sp. (Figs. 38 and 39). 



St. 123. 15. xii. 26. Off mouth of Cumberland Bay, South Georgia, from 4-1 miles N 54° E of 

 Larsen Point to 1-2 miles S 62° W of Merton Rock, 230-250 m.; gy. M. Large otter trawl: i speci- 

 men, probably cJ. 



St. 140. 23. xii. 26. Stromness Harbour to Larsen Point, South Georgia, from 54° 02' S, 

 36°38'W to 54° 11' 30" S, 36°29'W, 122-136 m.; gn. M. St. Large otter trawl: i ^, with 

 N. pfefferi. 



St. MS 66. 28. ii. 26. East Cumberland Bay, 2J miles SE of King Edward Point Light to i\ cables 

 W X N of Macmahon Rock, 18 m. Small beam trawl: 1$ (length of trunk = 1-4 mm.) and 

 1 immature specimen. 



St. MS 71. 9. iii. 26. East Cumberland Bay, 9J cables E x S to 1-2 miles E x S of Sappho Point, 

 60-1 10 m. Small beam trawl: 3 $? including holotype. 



St. MS 74. 17. iii. 26. East Cumberland Bay, i cable SE x E of Hope Point to 3-1 miles SW of 

 Merton Rock, 22-40 m. Small beam trawl: i specimen (sex uncertain, probably immature), with 

 A^. brevicaudatum ; i ? with A*", pfefferi. 



Description of holotype (9). Trunk rather compact, lateral processes separated by 

 approximately their own diameter, articulations between the segments well marked. 

 Cephalic segment less than half the length of the trunk, neck short and thick. Ocular 

 tubercle low and broad, situated in front of neck near the anterior border of cephalon, 

 eyes large (Fig. 38 a and b). 



Proboscis slightly decurved, approximately as long as cephalic segment, sub- 

 cylindrical, rounded at apex. 



Abdomen long, slender, very much elevated. 



Chelophore slender ; scape rather longer than proboscis ; chela not exceeding half the 

 length of the scape, fingers scarcely longer than palm armed with fifteen and nineteen 

 spinules respectively (Fig. 39 h). 



Palp five-jointed; third joint the longest, one-fourth as long again as the fifth and 

 nearly twice as long as second (Fig. 39 a). 



Oviger ten-jointed; first three segments together somewhat longer than fourth, 

 which is only slightly shorter than fifth. Number of denticulate spines on each of the 

 four terminal segments five, five, four and seven (in female from MS 66 nine, six, six 



