CUMACHA AND PHYLLOCARIDA. 
By W. T. Cauman, D.Se. (Brrrish Museum, Naruran History). 
(Published by permission of the Trustees of the British M useum.) 
(Plates XIX and XX.) 
Tue collection dealt with in this report, although a very small one, is -by no means 
devoid of interest. It comprises a new species of Diastylis, very distinct from any 
hitherto known from the Antarctic, and showing some resemblance to species inhabiting 
the North Pacific. Another Diastylis is referred to a species already known, of which 
it represents at least a very marked variation. The remaining Cumacea and the solitary 
Nebalia serve to fill in a very wide gap in the known distribution of the respective 
species. All the specimens were obtained near the Main Base of the expedition at 
Adelie Land. The following are particulars of the localities :— 
Boat Harbour, Commonwealth Bay. Dredging, 5 fathoms. Ist June, 1912. 
Nebalia longicornis. 
Station I. Lat. 66° 50’S., Long. 142° 6’ E.; 358 fathoms. 26th December, 1913. 
Cyclaspis gigas. 
Station IT. Lat. 66° 55’ S., Long. 145° 21’ E.; 318 fathoms. 28th December, 1913. 
Cyclaspis gigas, Diastylis Mawsoni, D. Helleri. 
CUMACHA. 
CYCLASPIS GIGAS Zimmer. 
Cyclaspis gigas Zimmer, Zool. Anz, XXXI, 1907, p. 367; id. Deutsche -Siidpolar 
Iixped. XIV, Zool. vi, 1913, p. 441, pl. i, figs 1-3, text-figs. 1 and 2; Stebbing, Das 
Tierreich, Cumacea, 1913, p. 38; Calman, Brit. Antarctic (“ Terra Nova ”) Exped. 
Zool. Ill, No. 5, 1917, p. 146. 
Occurrence.—Stat. 1, 19 ; Stat. IT, 3¢. 
Remarks.—The ovigerous female described by Zimmer was only 15 mm. in 
length, but an ovigerous specimen in the present collection is 20 mm. long, and some of 
the immature specimens exceed 18 mm. Nevertheless the agreement with Zimmer’s 
