22 W. A. HERDMAN. 
S. HEXAGONA, Quoy and Gaim. 
One damaged specimen from “ Winter Quarters, 1. vi. 03, No. 8 hole” probably 
belongs to this species. 
DOLIOLID. 
DoLIoLuM sp. 
Four imperfect specimens of the “ nurse” form of Doliolum, measuring from 4 to 
7 mm., were brought back from “1. vii. 04. Lat. 55° 44’ 8.; Long. 95° 432’ W. 
5 fathoms.” It is impossible to determine the species now. 
LARVACEA. 
APPENDICULARIID. 
OIKOPLEURA GAUSSICA. 
(Plate VII., figs. 14-17.) 
Oikopleura gaussica, Lohmann, Zool: JB., Suppl. viii. (1905), p. 359. 
A small tube from the Winter Quarters in McMurdo Bay, labelled “ 18. v. 03, 
No. 4 Hole, Plankton,” contains three specimens of a large Appendicularian. They 
are not in very good condition, and all probably belong to the same species, and in 
external form and in detailed proportion of the internal organs seem to agree better 
with O. gaussica than with O. valdivie—the two large Antarctic species described by 
Dr. Lohmann.* The measurements of body and tail in these three ‘ Discovery’ 
specimens are as follows :— 
Trunk ‘ é 1°25 mm., 1°5 mm., 1°5 mm. 
Tail ; ; : 7 mm. 9 mm. 9 mm. 
This species was also found at “3. i. 02, Lat. 66° 52’ 8.; Long. 178° 15’ E.” 
—one specimen: “7. i. 02, South of Pack”—53 specimens; “11 Jan. 1902, Ross 
Sea ”’—one specimen ; and ‘‘ 3-7 ”—six specimens. In some of these specimens the 
trunk measures up to 3 mm. in length, and the tail is about five times as long as the 
trunk, and may be as much as 2 mm. in width at its widest part. 
Our fig. 14 on Plate VIL shows the appearance, to the eye, of these ‘ Discovery’ 
specimens of (probably) O. gaussica, and fig. 15 shows the tip of the tail enlarged. 
Several sections through the tail are given in fig. 16 (A to D) to show the very 
different degree of development of the muscle bands in different parts of the same 
tail. D shows a case where the dorsal muscle band is co-terminous with the notochord, 
* Die Appendicularien des arktischen und antarktischen Gebiets, &c. Zoolog. Jahrb., Suppl. viii. (1905), p. 353. 
