62 
THE VOYAGE OF H.M.S. CHALLENGER. 
Habitat. — Atlantic Ocean ; near the Cape of Good Hope (Souleyet). 
Challenger Specimen. — Living, young. 
Station 181, August 25, 1874 ; Fiji to Raine Island ; lat. 13° 50' S., long. 151° 49' E. 
*11. Clio australis (d’Orbigny) (not Bruguiere) (PL II. fig. 8). 
1836. Hyalasa australis, 1 d’Orbigny, Voyage dans l’Amerique meridionale, t. v. p. 117, pL viii. 
figs. 9-11. 
1850. Balantium australe, Gray, Catalogue of the Mollusca in the Collection of the British 
Museum, pt. ii., Pteropoda, p. 15. 
1852. Gleodora australis, Souleyet, Voyage de la Bonite, Zoologie, t. ii. p. 189, pi. viii. 
figs. 20-25. 
For figures and description, see Souleyet ( loc . cit.). 
Habitat. — This species appears to have a geographical distribution like that of 
Spongiobranchsea australis and Ihmacina australis, that is to say, localised in the 
southern regions of the three great oceans around the South Pole. 
Cape Horn (d’Orbigny); South-east Pacific (48° S., 86° W., Souleyet); (?) south-east 
of the Cape of Good Hope, 38° 50' S. (Boas). 
Challenger Specimens. — Living. 
Station 159, March 10, 1874; Termination Land to Melbourne; lat. 47° 25' S., 
long. 130° 22' E. 
Observations. — Boas 2 has united with the present species Clio sulcata, Pfeffer. 
But the latter is certainly a distinct species, also collected towards the South Pole by 
the Challenger Expedition, and the embryonic shell 3 which Boas has figured as that of 
“ Cleodora australis ” is precisely similar to Clio sulcata, and very different from that 
of Clio australis (PI. II. fig. 8). For in the latter the embryonic shell is separated from 
the other portion by a much broader and deeper constriction, and is terminated 
posteriorly by a rounded extremity. 
# 12. Clio sulcata (Pfeffer) (PI. II. figs. 9-11). 
1879. Gleodora sulcata, Pfeffer, Uebersicht der auf S. M. Schiff Gazelle, und von Dr. Jagor 
gesammelten Pteropoden, Monatsber. d. k. preuss. Akad. d. Wiss. 
Berlin, 1879, p. 240, figs. 11, 12. 
Characters and Description. — Shell slender, with a very slight curvature, with the 
ventral surface only slightly projecting, but not re-entrant. The surface adorned with 
transverse ridges ; nine longitudinal ridges occur in close proximity on the anterior portion 
of the dorsal surface. The margins of the aperture, as Pfeffer has noted, are very fragile, 
1 The name Hyalsea australis was already used in 1816 by Peron (Voyage de d4couvertes aux terres australes, 
pi. xxxi. fig. 5), but it only occurs on the plate, and no description is given. As the figure refers to Cavolinia tridentata, 
I think the specific title australis may be fitly retained for the above species of Clio. 
2 Spolia atlantica, p. 68. 3 Ibid., pi. iv. fig. 46. 
