56 
THE VOYAGE OF H.M.S. CHALLENGED. 
Station 85, July 19, 1873 ; off Palma Island (Canaries); lat. 28° 42' N., long. 18° 6' W.; 
depth, 1125 fathoms; bottom, volcanic mud. 
Station 120, September 9, 1873; off the coast of South America, between Pernam- 
buco and Bahia; lat. 8° 37' S., long. 34° 28' W.; depth, 675 fathoms; bottom, 
red mud. 
Station 185, August 31, 1874 ; off Paine Island; lat. 11° 35' 25" S., long. 144° 2' 0" 
E.; depth, 135 fathoms; bottom, coral sand. 
Station 219, March 10, 1875; Admiralty Islands to Yokohama; lat. 1° 54' 0" S., 
long. 146° 39' 40" E.; depth, 150 fathoms ; bottom, coral mud. 
Subgenus Styliola , 1 Lesueur. 
1825. Styliola, Lesueur, in de Blainville, Manuel de Malacologie, p. 655. 
Characters and Description. — Shell conical, straight, considerably elongated ; the 
surface smooth, with a dorsal groove not parallel to the axis of the shell, but slightly 
oblique, turning from left to right, with only the anterior extremity (which ends in a 
rostrum) in the median line ; the embryonic portion only vaguely separated from the rest 
of the shell, and ending in a pointed apex. 
The animal with the two tentacles distinctly visible ; the transparent, non-muscular, 
marginal area of the fin situated towards the middle of the lateral margin ; the posterior 
lobe of the foot is long. 
Observation. — The name Styliola, first used in 1825 by Lesueur in the Manuel de 
Malacologie of de Blainville, has been regarded by English and American conchologists 
as synonymous with the later title, Creseis, Rang. This opinion is based, however, on a 
misinterpretation of the typical species, Styliola recta, Lesueur ( sine descriptione), 
which has been taken by these authors for Clio acicula. But the descriptions given of 
the genus Styliola enable one to infer that Styliola recta is really Clio subula, and not 
Clio acicula. 
The difference between Styliola (in the usage of Lesueur) and Creseis (s. str.) may be 
gathered from a comparison of the two descriptions given above. The structural 
features, as will be shown in the Anatomical Report, go to show that Styliola is much 
more nearly related to Clio (s. str.) than to Creseis, and on the contrary that the forms 
included under the latter designation have retained some more archaic characters of 
the Limacinidse. 
This subgeneric section includes only a single species. 
1 Diminutive of arvMs, column. 
