No. 16. — On the Jaw and Lingual Dentition of certain Terrestrial 
Mollusks. By W. G. BINNEY. 
(WitH Two Pratss.) 
CHLAMYDEPHORUS.* 
Animal (PI. II. Fig. A) limaciform ; mantle covering the whole body, with 
an orifice on the centre of the back near the tail, enclosing at the same part a 
subhexagonal, solid, internal shelly plate : no caudal mucus pore; distinct lo- 
comotive disk to foot ? external excretory, respiratory, and generative orifices ? 
tentacles and eye-peduncles two each: no jaw: teeth of lingual membrane 
(Pl. II. Fig. B) as in Glandina, arranged in chevron, aculeate. 
This generic name is suggested for a peculiar slug collected by Mr. J. S. 
Gibbons in Natal Colony, Africa, and submitted by him to me. Its mantle 
covering the whole body can be compared only to that of Tebennophorus (Me- 
gumathium, Incilaria, Philomycus), Pallifera, Athoracophorus (Janella, Anectea, 
Triboniophorus, Aneitum), Veronicella, and Vaginulus as restricted by Stoliczka 
(Journ. Asiatic Soc. Bengal, N.S. xlii. pt. 2, pp. 33-37) to the agnathous spe- 
cies resembling Veronicella. This last genus, Vaginulus, can alone be com- 
_ pared with the slug before me in wanting a jaw and having Glandina-like teeth 
on its lingual membrane, and at the same time not having any external shell. 
It differs, however, from the Natal slug in wanting the peculiar dorsal orifice, 
_ and the internal shelly plate. I am forced, therefore, to suggest a new name 
for this slug. The dried condition of the animal prevents me learning the po- 
sition of the external orifice of generation ; I suspect that of respiratory and 
excretory organs to be through the hole on the centre of the animal’s back. 
The single specimen received is deposited in the collection of the Phila- 
delphia Academy of Natural Sciences, together with the internal shelly plate 
and the mounted lingual membrane. 
Chlamydephorus Gibbonsi. 
Animal (Pl. II. Fig. A) elongate, rather slender, cylindrical, rather more 
than 3 inches long when fully extended, tapering towards head, broadest about 4 
| inch from tail, towards which it slopes ; tail rather blunt ; dorsum rounded, hese 
small ; color a dark, dull orange, thickly mottled, and marbled with dark olive 
| brown, the margin of the foot and mesial line of dorsum being the only parts 
_ where the ground color is well seen. A slight eminence on the broadest part 
of the body (near posterior end) is perforated by a round orifice, a line or 
_ Tather more in diameter ; from this small orifice furrows radiate, passing to tail, 
to the margin of foot and forwards ; dorsum finely sulcato-striate from head to 
orifice, hey strie being granulose. A row of small regular tubercles runs along 
* yraus, pépw. 
