1872.] F. Stoliczka — On the Cyclostomacea of Penang. 269 
having the constricted portion of the last whorl much more produced and 
very, much deflected, the height of the shell being also considerably les3 than 
the larger diameter of the shell. Eydoux who collected the species at 
Touranne in Cochin-China, says in his original description,* that the 
operculum is membranaceous and not multispiral. 
The species is not uncommon along the base of the hills in thick jun- 
gle, under and on large blocks of rocks, generally between half decomposed 
vegetable matter. 
The animal is dusky grey, foot pale; tentacles long, pale at the base, 
further on dark, especially at the tips which are slightly thickened ; eyes 
small, placed laterally at the bases of the tentacles, hut the bulgings are 
not distinct ; rostrum long, cleft at the end, reddish at the base on account 
of the fleshy colour of the manducatory apparatus. 
Pam . — Lagocheilida:. 
Genus. Lagocheilus, Theobald. 
Comp. Blanford in Ann. and Mag. N. H., third Ser., 1864, vol. XIII, p. 452. 
Shell conoid sub-turbinate and perforated, thin, covered with a horny 
cuticle ■ aperture round with a narrow incision in the upper or posterior 
angle ; operculum thin, horny, multispiral. A.nimal of the usual Cyclopho- 
rid type, hut with a glandular slit at the upper posterior end of the foot. 
The shell of Lagocheilus, when the cuticle is removed, merely differs 
from Leptopoma by the slight incision in the posterior angle of the aper- 
ture. When Mr. Theobald suggested the above name, it could scarcely 
have been anticipated that such a comparatively insignificant character will 
be accompanied by a most important structural distinction iu the anatomy of 
the animal. Mr. Blanford, already many years past, noticed that the animal 
of the Barmese Lagocheilus leporinus f has the peculiarity of possessing a 
groove down the middle of the upper caudal portion of the foot. Since then 
I had observed the animals of L. tomotrema, of two new species from Penang, 
and of two other species from the Nieobars, and I find that all the 
animals posses a long glandular slit at the upper end of the foot, and 
that the incision in the apertural margin is the result of the presence of 
this pedal slit. This instance is an excellent illustration of the occasional 
intimate structure and the relation of the animal to its shell. 
Lagocheilus, together with Lermatocera, has evidently among the Cyclo- 
stomacea the same systematic position, as the Zonitidje have among the 
Helicacea. The external character of the animal of Lagocheilus is accom- 
panied by some peculiarities in the dentition and in the internal organs with 
which I hope to deal at some future occasion, in connection with a general 
account of the anatomy of the Indian Cyclostomacea. 
• GuiSrin-Meneville’s Magasin do Zoologio, for 1838. 
f Journal A. S. B, for 1865, PI. II. p. 82. 
