16 W. A. HERDMAN. 
on a fold, with that of M. zmpura, does not show the characteristic knob-like processes 
of that species figured by Dr. Traustedt. 
This single specimen of Molgula concomitans has a specimen of Molgula longicaulis 
attached by the lower half of its long stalk near the anterior end (see fig. 1, B and 
fig. 3). 
ASCIDIID Ai. 
CoRELLA EUMYOTA. 
(Plate IIL, figs. 1-6.) 
Corella eumyota, Traustedt, Vid. Medd., 1881, p. 271. 
Corella novare, v. Drasche, Denk. Ak. Wien, xlviii., 1884, p. 382. 
Corella antarctica, Sluiter, Bull. Mus. Nat. Hist. Paris, xi. (1905), p. 471; id., Exp. Ant. Franc. 
(Charcot), p. 31. 
Locality.—Auckland Islands, Laurie Harbour ; various dates, March, 1904; nine 
specimens ranging from 1°8 to 3 cm. in length. 
External Appearance.—Body elongate-ovate, with the branchial aperture at the 
narrower anterior end and the atrial about half-way back, both on prominent siphons 
(Plate III. figs. 1-3). Attached by the greater part of the right side. Posterior end 
rounded. Surface smooth. Colour yellowish grey. , 
Test thin, cartilaginous to membranous, translucent, easily torn. 
Mantle moderately muscular, recalling that of an Ascidia; sphincters well 
developed. 
Branchial Sae with the spiral stigmata short, and traversed by many connecting 
radial or irregular short, wide, thin-walled vessels (fig. 6). Internal bars narrow, 
supported on triangular connecting ducts. 
Dorsal Lamina represented by stout tentacle-like languets, with occasional shorter 
ones alongside (fig. 6). 
Tentacles numerous and closely placed. There are about thirty large and at least 
thirty much smaller placed between (figs. 5 and 6). 
Dorsal Tubercle simple, crescentic, with the horns more or less incurved. There 
is no peritubercular area, but behind the tubercle is a very large epipharyngeal languet 
with a deep groove (fig. 6), which forms the beginning of the series of dorsal languets. 
I agree with Drs. Sluiter and Michaelsen in considering that Traustedt’s Corella 
eumyota, from Bahia and Valparaiso in South America, is the same species as Dr. von 
Drasche’s Corella novare, found during the ‘Novara’ Expedition at St. Paul’s Island 
in the Indian Ocean. But I would go further, and suggest that Sluiter’s Corella 
antarctica, obtained during the ‘Charcot’ Expedition at “Ile Booth Wandel, 
40 métres,” is merely a larger, more polar, form of the same variable species ; and in 
that case I would include also these smaller forms collected by the British Expedition 
at the Aucklands. 
Two courses are open to us in such cases: (1) to include all the closely related 
