MOLLUSCA OF INDIA. EIS 
The extremity of the foot (fig. 7) is somewhat truncate, the lube 
overhanging the mucous gland, which does not extend to the base 
or sole of the foot. 
Referring to the above paper by Mr. Wood-Mason, the taxonomic 
value of this organ is no doubt considerable. He says, “ As Pul- 
monata possessing a ciliated peripodium with and without a terminal 
pit were found in every quarter of the globe, and as it was in the 
highest degree improbable that so highly specialized a structure sub- 
serving such an important purpose in the animal economy as this 
evidently did had arisen independently many times in many dif- 
ferent forms in many widely separated areas of the earth’s surface, 
he considered that it had a higher taxonomic value than had hitherto 
been assigned to it.” 
Mr. Wood-Mason proposed “to distinguish those forms that 
possessed it and those that did not (or had lost it) from one another 
by calling them Craspedophora and Lipocraspeda respectively.” 
Similar distinctive titles had been given by Desmoulins in 1829, 
PueRePpor® and Aporm respectively. I do not think its function 
is merely to catch the coagulated fluid after it has passed over the 
body, which it appears to do, for it may often be seen covering the 
orifice, but that the opening is more or less connected with the 
lacunar portion of the body-cayity, through which similar mucous 
excreta pass away. It is probably homologous to the canals and 
orifices in the foot of Haliotis and other genera; or may it not be 
analogous to the water vascular system of the Turbellaria? How- 
ever this may be, it is a form of development on which there is 
much to be studied and cleared up. 
The generative organs (Plate XXVII. fig. 1 d) are as in M. indica 
(compare Plate XVIII. fig. 6), the spermatheca being longer than 
in that species and the cecum calciferum is not so well developed ; 
ovo-testis not seen. Penis (fig. 1 d, P): the cecum calciferum is re- 
presented by a short rounded gland (A) close to the junction of the 
yas deferens ; amatorial organ (D) very large and cylindrical; sper- 
matheca (Sp) very long, reaching nearly to the albumen-gland; in- 
testine, the salivary gland (Plate XXVII. fig. 1c) is elongate, 
bifurcating at the anterior end, where the two ducts to the buccal 
mass are given off. 
The teeth of the radula (Plate X XVII. fig. 16) are arranged 
thus— 
SOpe oe Moe FLD Oy Oo 
Oo shy. OO 
and are also similar to M. indica, the median being all tricuspid, 
but are far more numerous, there being six more on either side of 
the central tooth, not including the two teeth of transitional form ; 
tke outermost bicuspid laterals are also longer, with one point, the 
inner, exceeding the outer throughout. The jaw (fig. 1 @) has the 
central projection on the cutting-edge, but is not so curved in form, 
It will thus be seen that these two species of Macrochlamys are 
