Mr. J. Gwyn Jeffreys on Mediterranean Mollusca. 85 
40-310 f. Very different from A. tornatilis in size, shape, 
solidity, and sculpture. Forbes’s T. globulina appears to 
be a younger state of A. pusillus, having the stri; rubbed 
down, but showing traces of the puncture-like markings. 
I have before me the types of this and A. pusillus, which I 
had previously regarded (judging only from the short de- 
scriptions or diagnoses) as the young and fry of A. tor- 
natilis. 
Acteon exilis*, Jeffr. 
SHELL oblong or somewhat spindle-shaped, semitranspa- 
rent, and glossy: sculpture, numerous spiral striæ or im- 
pressed lines, which are quite smooth or plain, instead of 
being punctate as in other species of this genus: colour 
clear white: spire elongated, with a blunt apex: whorls 
three, moderately convex ; the last occupies three-fourths of 
the spire ; the first is mammiform : suture distinct, margined : 
mouth rather narrow, irregularly pear-shaped, expanded at 
the base; length three-fifths of the shell: outer lip gently 
curved, and folding inwards: inner lip folded back on the 
lower part: pillar flexuous: fold strong and conspicuous. 
L. 0:075, B. 0:045. 
Med. 310 f. It is not unlike A. levidensis of S. Wood, 
from the Coralline Crag at Sutton; but in that species the 
suture is deeper (making the spire appear pyramidal), and 
the striæ are punctate. 
Bulla hydatis, L. B.C. iv. 437, and v. 224, pl. 95. f. 3. 
Med. 40 f. 
B. utriculus, Brocchi. B.C. iv. 440, and v. 224, pl. 95. f. 4. 
Med. 40-310 f.; P. 10-584 f. s 
Scaphander gibbulus, Jeffr. Ann. & Mag. N. H. ser. 2. xvii. 
88, pl. 2. f. 20, 21. =?Bulla turgidula, Forb. Med. 40 f. 
S. lignarius, L. B. C. iv. 443, and v. 224, pl. 95. f. 5. Med. 
60 £.; P. 15-517 f. 
Philine scabra, Müll. B. C. iv. 447, and v. 224, pl. 96. f. 4. 
Med. 310 f. ; P. 420-1215 f. 
Assiminea littorina, D. Ch. B. C. v. 101, pl. 97. f. 6. Med. 
; drifted ? 
Atlanta Peroni, Lesueur. Ph. ii. 205. Æg. 100-250 f. 
* Slender. 
