MOLLUSCA.—HEDLEY. 
65 
& 
Doris Antarctica sp. nov. 
(Plate IX., fig. 102.) 
Animal large, thick, oblong. Dorsal surface evenly and closely covered with fine 
grains among which larger grains are set at about 3mm. or 4mm. apart. Branchiae 
12, bipinnate, exsert in the preserved specimen. Rhinophores perfoliate, retractile 
in simple pockets about 20mm. apart. Length, as contracted, 100 ; breadth, 60 ; 
height, 50mm. 
Jaw absent. Radula (text fig. 3) of 39 half rows ; the laterals with simple, long, 
oblique, knife-like cusps which diminish medially till on the subrachidian there is a 
small and shortly reflected cusp. 
% 
Fig. 3. 
Two specimens from 350-400 fathoms, Commonwealth Bay. 
The salient characters of this species are its large size and finely tuberculate dorsal 
surface. Sir C. Eliot remarks that Bergh’s classification improperly extinguishes the 
Linnean Doris* He therefore remodels Doris to include Staurodoris (= Dorissensu 
stricto), Archidoris, Ctenodoris, Anisodoris, and Homoiodoris. The present species is 
referable to the first section which already includes five Antarctic members. 
Doris nivalis Thiele. 
Archidoris tuberculata, var., Yayssiere, First Exped. Antarct. Frang., 1906, Nudibranch., 
p. 4, pi. iii., figs. 39-41. 
Archidoris nivalis Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 221. 
The tubercles on the back are of equal size in the largest, as in the smallest specimen, 
so that the older are comparatively smoother in appearance. 
From Commonwealth Bay—one, September 3rd, 1912, from 25 fathoms ; and 
another, December 21st, 1913, from 55-60 fathoms. One, January 31st, 1914, from 
110 fathoms, hard ground, off the Shackleton Ice-shelf, in South Lat. 64° 32' and East 
Long. 97° 20' ; the latter is 65mm. long. One, January 27th, 1914, from 120 fathoms, 
hard ground, in the Davis Sea, in South Lat. 66° 8' and East Long. 95° 17' ; this has 
a length of 70mm. 
* Eliot.—Brit. Nudibranch, Mollusca, 1910, p. 95; and Apstein-Sitz, Gesell. Naturf. Fr. Berlin, 1915, p. 121. 
Vol. iv„ Part 1—i 
