CALLIOPIIDAE 



163 



The dorsal processes in novae-zealandiae, when seen in dorsal view, are not acute, 

 scarcely subacute, but merely rounded. Pleon segment 3 is feebly carinate, and the 

 carina not at all raised. Postero-inferior angles of pleon segments 1-3 ending in small 

 acute points, that on segment 1 very small. Side-plate 1 oblong (cf. Chilton, 1920, 

 fig. 1) ; none of the side-plates serrulate, or only very obscurely so. Hind margin of 2nd 

 joint in peraeopods 3-5 feebly serrulate. Gnathopod 1, 6th joint subequal to 5th, 

 tapering slightly distally, palm oblique, convex. Peduncle of uropod 3 produced on 

 lower inner apex in a short process for the reception and support of the inner ramus 

 (cf. ventral view given by Chilton, 1920, fig. 5). The inner ramus is not at all flattened, 

 but triquetral in cross-section. The whole integument is covered with an exceedingly 

 fine and regular pitting. 



The last character decisively separates novae-zealandiae as a species from the Ant- 

 arctic species here described. 



On the other hand, these latter species all agree with the New Zealand species in the 

 character of the peduncle and inner ramus of uropod 3 . The triquetral shape of the 

 inner ramus appears also in O. longimanus, Boeck (cf. Shoemaker, 1930, p. 88, fig. 37 e), 

 but the prolongation of the peduncle seems to be very slight or even absent (cf. the 

 same figure). These features are not utilized by Shoemaker in his discussion of the 

 generic characters of Leptamphopus and Oradarea. Both appear to be absent in Lept- 

 amphopus longimanus, Sars (= sarsi Vanhoff.), judging from Sars' pi. clxii (1895). 



Shoemaker includes in the genus the northern longimanus, Boeck, non Sars, and thus 

 proposes the name walkeri for Walker's preoccupied " longimana" '. He also suggests 

 that novae-zealandiae might be placed temporarily in Halirages. With the qualification 

 "temporarily" I agree; a new genus would be more suitable. 



Oradarea tridentata, n.sp. (Figs. 96 a, 97). 



? Chilton, 19 1 2, p. 488 {Leptamphopus novae- 

 zealandiae, non Thorns.). 

 ? Chevreux, 1913, p. 143 (part, Leptamphopus 

 novae-zealandiae, non Thorns.). 



Occurrence: 1. St. 123. South Georgia. 1 $ 



10 mm. 



2. St. 141. South Georgia. 11 ovig. 

 ?? 10-11 mm. 



3. St. 142. South Georgia. Many 

 <$<$, ovig. $$ and immat. up to 



1 1 mm. from cup sponge. 



4. St. 145. South Georgia. 2 <?<? 6 

 and 8 mm., 16 $$ (12 ovig.) 10- 



12 mm. Types. 



5. St. 149. South Georgia. 1 $ 

 10 mm., 1 ovig. $ n mm. 



c cf. 



6. St. WS 25. South Georgia. 1 ? Fig. 96. Heads of Oradarea. a. tridentata and tri- 



carinata. b. bidentata. c. impressicauda. d. edentata. 



10 mm. 



