482 MURICIDA. 
M. sepraneutaris, Mont. 
Mangelia septangularis, Brit. Moll. iii. p. 458, pl. 112. f. 6,7; (animal) 
pl. 1.7. £.3. 
Animal with eight spiral turns, white in all parts, powdered 
with more intense minute flake-white pomts. Mantle rather 
thick at the edges, and produced into a fleshy branchial fold 
that extends beyond the short canal of the shell. The head 
is compressed, narrow, with a vertical fissure below it, from 
which a retractile proboscis issues. The coalition of the ten- 
tacula at their bases is not in the least impeded by any pro- 
jection of the head; they are short, setose, with the ‘eyes on 
attached thick offsets at the external pomts, at about two- 
thirds of their length; the remaining portion is very short. 
Foot rather narrow, slightly auricled, truncate in front, mo- 
derately long, with the termination nearly as broad behind as 
in front, without a trace of a distinct poimt, though it is often 
more or less emarginate ; it carries on the upper part a strong, 
very elongated, oval, pale corneous operculum formed of un- 
guiculated segments. The sinus or emargination at the upper 
part of the aperture is very slight. 
This species is not often obtaimed alive at Exmouth; its 
range of habitat is from the littoral to the corallme zone. It 
has by some authors been deposited in Pleurotoma,—on what 
grounds can scarcely be satisfactorily explamed, as the 
emargination is almost obsolete, or less conspicuous than in 
any other of the minor so-called Pleurotomata ;, besides, as 
has been stated, the head is perfectly flat, without a trace of 
projection to intercept the coalition of the tentacula. We 
consider it in every respect a varicose Murew. 
The following have not been seen by me alive :— 
M. corauuinvs, Scacchi. 
M. corallinus, Brit. Moll. 11. p. 374, pl. 102. f. 5, 6. 
M. Barvicensis, Johnston. 
Trophon Barvicensis, Brit. Moll. i. p. 442, pl. 111. f.5, 6; (animal) 
pl.S.S. f. 4. 
M. ciaturatus, Linneeus. 
M. Bamffius, Auct. 
Trophon clathratus, Brit. Moll. iii. p. 436, pl. 111. f. 1,2; (animal) 
pl. S.S. f. 3. 
