REPORT ON THE PTEROPODA. 
51 
II. The figure given by Eschscholtz has been referred by Gray and by Souleyet (not 
without hesitation) to Clio mbula ; I have indicated above that this identification is 
impossible. 
On the other hand Boas, who is of opinion 1 that Clio virgula and Clio acicula 
should be united, figures 2 under the title “ Cleodom acicula” a specimen which 
undoubtedly belongs to the species under discussion. At the same time he designates 
as “ Cleodora acicula ” 3 the specimens of the “ Vettor Pisani ” Expedition, which also 
resemble Clio conicci. The latter is distinguished from Clio acicula not only in the 
characters of the shell noted above, but also in the conformation of the liver, which agrees 
with what is found in Clio virgula. Clio conica is beyond dispute more nearly allied to 
Clio virgula than to Clio acicula. 
Dimensions. — Besides being distinguished by certain characters of the shell and of 
the animal, Clio conica is also marked by its size, which never exceeds 7 mm. 
Habitat. — Atlantic Ocean : coast of Brazil (Eschscholtz) ; coasts of North America (if, 
as I believe, Styliola vitrea = Clio conica ). 
Mediterranean : Naples. 
Pacific Ocean : eastern portion, 0 N., 84° 40' W. (“Vettor Pisani” Expedition). 
Challenger Specimens. — Deposit shells. 
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. 
# 3. Clio ( Creseis ) acicula (Rang). 
1828. Creseis acicula , Rang, Notice sur quelques Mollusques nouveaux du genre Cleodora, &c., 
Ann , d. Sci. Nat., ser. 1, t. xiii. p. 318, pL xvii. fig. 6. 
1828. Creseis clava, Rang, I lid., p. 317, pi. xvii. fig. 5. 
1829. Creseis acus, Eschscholtz, Zoologischer Atlas, Heft iii. p. 17, pi. xv. fig. 2. 
1836. Hyalxa aciculata, d’Orhigny, Voyage dans l’Amerique meridionale, t. v. p. 123, pi. viii. 
figs. 29-31. 
1850. Styliola reda, Gray, Catalogue of the Mollusca in the Collection of the British Museum, 
pt. ii., Pteropoda, p. 18. 
1852. Cleodora acicula , Souleyet, Voyage dela Bonite, Zoologie, t. ii. p. 194, pi. viii. figs. 10-17. 
For description and figures, see Souleyet, loc. cit. (in the above list of synonyms). 
Habitat.— Atlantic Ocean, from 48° N. to the Cape of Good Hope (Pfeffer), and to 
40° S. (Knocker). Mediterranean : Naples, &c. Indian Ocean : from the Gulf of Bengal 
to 29° S. (Boas) ; from Zanzibar (Pfeffer) to near Australia (95 E.). 
Pacific Ocean : West, China Sea (Boas) ; Central Pacific, from 10° N. (Knocker) to 
23° S. (Pfeffer), and towards 153° W.; Eastern Pacific towards the equator, 88° W. 
(“Vettor Pisani” Expedition). 
1 Spolia atlantica, p. 202. 
2 Ibid., pi. vi. fig. 94. 
3 Ibid., p. 61. 
