REPORT OR THE PTEROPODA. 
63 
so that it is difficult to describe the exact form of the lips, though this is probably 
intermediate between that of Clio australis and that of Clio p yramidata . The 
embryonic shell is almost directly continuous with the other portion, from which it is 
separated only by a narrow groove. The posterior extremity is pointed. 
The figure 1 7c of Pfeffer (pi. vii., loc. cit.) represents the curvature of the shell as if 
it were ventral. The specimen figured must then have been abnormal, for in all the 
specimens of Clio sulcata i which I have seen the curvature was dorsal, as it is indeed in 
all the curved Cavoliniidse. 
The animal resembles that of neighbouring species ( Clio australis and Clio 
pyramidata). The left tentacle is readily visible ; the posterior lobe of the foot is of 
considerable length, and the other external characters are those of the genus Clio in the 
strict sense. There are no lateral prolongations of the margins of the mantle. 
This form is undoubtedly a distinct species which cannot be referred either to Clio 
australis (as by Boas) or to Clio pyramidata. It differs from both in the fact that 
the ventral surface of the shell is not at all re-entrant. And further it differs from Clio 
australis (with which it has a closely analogous geographical distribution) in its much 
more divergent lateral margins and in its embryonic shell, as may be seen by comparing 
the figures of the two species. This form was the Clio observed on the last expedition 
of the “ Astrolabe,” to which I have referred in my Beport on the Gymnosomata. 1 
Dimensions . — The shell measures 2 cm. in length. 
Habitat . — Like Clio australis, this form was found in the southern region of the 
Pacific Ocean, lat. 50" 34/ S., long. 83° 44' W., and lat. 45° 35' S., long. 122° l' W. 
(Pfeffer); also in the Southern Ocean, near Kerguelen Island; and in the Antarctic 
Ocean (see the following Challenger localities). 
Challenger Specimens . — Living specimens. 
Station 150, February 2, 1874 ; Heard Island ; lat. 52° 4' S., long. 71° 22' E. 
Between Stations 154 and 155, February 21, 1874; in vicinity of Antarctic ice; 
lat. 63° 30' S., long. 89° 8' E. 
Station 156, February 26, 1874; in vicinity of Antarctic ice; lat. 62° 26' S. ; 
long. 95° 44' E. 
*13. Clio pyramidata, Linne. 
1767. Clio pr/ramidata, Linne, Systema Naturse, ed. 12, p. 1094. 
1813. Hyaleea lanceolata, Lesueur, Me moire sur quelques especes d’animaux mollusques et 
radiaires recueillis dans la Mdditerranee pres de Nice, Nouv. 
Bull. Soc. Philom. Paris, t. iii. p. 284, pi. v. fig. 3. 
1825. Cleodora brovmii , De Blainville, Manuel de Malacologie, pi. xlvi. fig. 1. 
1836. Hyahea pyramidata, d’Orbigny, Voyage dans l’Amerique meridionale, t. v. p. 113, pi. vii 
figs. 25-29. 
1841. Cleodora lamartinieri, Rang, in d’Orbigny, Mollusques de Cuba, p. 83. 
1 Zool. Chall. Exped., pt. lviii. p. 62. 
