INDIAN NUDIBRANCHIATE MOLLUSCA. 141 
which is yellow, with the extreme apex white: at the inner base of these papille arise 
three delicate bipinnate plumes of a white or pale-yellow colour. Foot linear, spread- 
ing a little at the sides. Length 1? inch. 
Bornella digitata, Adams & Reeve, in Voy. Samar. p. 67. t. xix. f. 1. 
Rather rare. Two or three specimens were brought home. 
Family PROCTONOTIDA, Alder § Hancock. 
Body depressed. Cloak more or less distinct. Dorsal tentacles non-retractile. Oral 
tentacles small or wanting. Branchiz fusiform or linear, arranged round the cloak on 
each side of the back and above the head in front. Anus dorsal or lateral. Mouth with 
corneous jaws. 
Genus MaprELLA, nov. gen. 
Body depressed, ovate, with a distinct cloak. Dorsal tentacles with the upper por- 
tion papillated; no oral tentacles. Head broad, with a semilunar veil. Branchiz 
papillose or linear, placed in several rows round the margin of the cloak. Anus lateral. 
Tongue narrow, with three pectinated plates in each row. 
The anatomy of this genus proves its close relationship to Antiopa. The buccal organ 
is extremely large and muscular, and the jaws are very large and strong ; but their cut- 
ting edges are devoid of the denticulations that characterize these organs in that genus. 
In this respect Madrella agrees with Proctonotus. The narrow tongue, however, is 
peculiar, that of the other members of the family being generally broad, with numerous 
smooth spines. In our species it is strap-formed, with fifty-seven or fifty-eight rows of 
pectinated plates, three in each row ; the central one has eight or nine denticulations on 
each side, and a large spine in the centre; the lateral plates have a large spine at the 
outer margin, and twelve or thirteen smaller ones or denticulations on the inner margin. 
The esophagus is short: it leaves the dorsal wall of the buccal organ further forward 
than usual. There are apparently no salivary glands. The stomach is wide and irre- 
gularly rounded. The intestine is a widish tube of moderate length ; it passes to the 
right, and then dips below the ovary, and, bending backwards, ascends a little to ter- 
minate in a nipple-formed anus, situated about two-thirds down the right side, directly 
below the overhanging pallial margin. 
The gastro-hepatic system is arranged much in the same manner as it is in Antiopa. 
A dark brown folliculated glandular substance extends all round the animal, within the 
expanded pallial border. This substance, which, in the living state, would probably 
assume a branched appearance, is connected with the stomach by three wide tubes, two 
of which, the anterior, pass from the upper wall of the stomach at its junction with the 
cesophagus, and go, one on each side, to the folliculated substance in front; the third 
