ACANTHONOTOZOMATIDAE 119 



Genus Iphimediella, Chevr. 

 Chevreux, 1913, p. 119. 

 Barnard, 1930, p. 348. 



I am now inclined to place I.pacifica, Stebb., in this genus, and also, as shown below, 



nodosa, Dana. 



Iphimediella margueritei, Chevr. 

 Chevreux, 191 3, p. 120, figs. 22-24. 

 Barnard, 1930, p. 348, fig. 22. 

 Occurrence: 1. St. 42. South Georgia. 1 juv. 7-5 mm. 



2. St. 175. South Shetlands. 1 ? 15 mm. 



3. St. MS 71. South Georgia. 1 ? 16 mm. 



Remarks. In all these specimens the side-plates 1-3 are of the form figured in the 

 Terra Nova Report. /. microdentata, Schell., is not a synonym of this species (see note 

 supra, p. 116). 



Distribution. Graham Land, 200 m.; 'Gauss' winter station, 385 m.; McMurdo 

 Sound, 256-457 m. 



Iphimediella bransfieldi, n.sp. 



Occurrence: St. 175. South Shetlands. 2 ovig. ?$ 14 and 22 mm. 



Description. Very like rigida, Brnrd., but with only three pairs of dorsal processes, 

 viz. on peraeon segment 7 and pleon segments 1 and 2 ; and the dorsal keel on pleon 

 segments much feebler (in the smaller specimen obsolete), especially on segment 4 

 where there is no upstanding tooth. Lateral margin of head as figured for brevispinosa 

 Brnrd., but in the smaller specimen the lower tooth is longer. Side-plate 1 oblong in 

 the larger specimen, apically truncate and concave, the antero-inferior angle rounded; 

 in the smaller specimen narrowing slightly below to an almost bidentate apex. 



Antenna 1 with one tooth on anterior margin of the long spinous tooth on 1st joint, 

 which extends only to end of 2nd joint. Mandible with apex bidentate, but there are 

 3-4 accessory denticles, secondary cutting plate in left mandible clavate. Maxilliped, 

 2nd joint of palp expanded, but scarcely produced along inner margin of 3rd joint. 



Remarks. The antero-lateral margin of the head with its narrow notch, as well as 

 the mandibles, preclude this form from being by any chance the form described by 

 Schellenberg as sexdentata. 



From Maxilliphimedia longipes (Wlkr.), which it closely resembles in dorsal armature, 

 it is distinguished by the anterior margin of the head and pre-eminently by the mouth- 

 parts. 



Iphimediella nodosa (Dana) (Fig. 67). 



Bate, 1862, p. 125, pi. xxiii, fig. 1 (after Dana). 



Delia Valle, 1893 (F. u. Fl. Golf. Neap.), p. 583, pi. lviii, figs. 89, 90. 

 Stebbing, 1906, p. 216; 1914, p. 358. 

 Chevreux, 1913, p. 118. 

 Non Barnard, 1930, p. 361 (= echinata). 

 Occurrence : St. WS 85. Falklands. 1 $ with embryos 7-5 mm. 



