334 PROCKEDINGS OF THE MALACOLOGICAL SOCIETY. 



and fleshy. The mantle-edge is thick. The back is entirely covered 

 with small tubercles, which extend to the pockets of the rhinopliores 

 and brancliioe, but are not specially large there. They are about 

 •75 mm. high and stiffened by spicules, four of which usually project 

 from the tip. The tubercles are not tapering, but either of uniform 

 diameter or larger at the top. Under the microscope it can be seen 

 that their sides bear minute projections. They are all whitish, the 

 dark colour of the spots residing entirely in the level dorsal surface. 



The openings of the rhinophores form gently swelling hillocks, but 

 an; not protected by raised sheaths. The large rhinophores are 

 j'ellowish with darker mottlings, and bear at least 30 deep perfoliations. 

 The branchial pocket has a slightly raised, crenulate rim. The branchite, 

 which are deeply retracted, are tri- and in places quadripinnate. 

 There is one separate plume in front, and at the sides two groups of 

 two plumes each, so that the branchiae can be counted as 5 or 9 

 according as these groups are regarded as two plumes or a bifid 

 plume. They are greenish with darker mottlings. 



The tentacles as preserved are long and flat, furrowed on the upper 

 surface, and almost auriculate. The foot is very large, being nearly as 

 long and wide as the body. In front it is grooved, and the thin upper 

 lamina is divided by a median notch. 



The blood-gland is white, fairly large, and lies in two divisions, one 

 before and one behind the central nervous system, which is yellow 

 and distinct. Seen from above the divisions between the ganglia are 

 not very marked, but they are plain from below. The cerebral 

 ganglia are continuous with the pleural and bear the sessile eyes in 

 front. The pedal ganglia are separable and roundish ; the buccal 

 are fairly large, round, close together, and bear the small gastro- 

 oesophageal ganglia. The salivary glands are large and band-like. No 

 ptyaline glands were found, but some hardened tissues adhering to the 

 buccal mass may have originally been glandular. 



On tlie labial cuticle is an armature (Fig. la), which, though large 

 enough to be seen by the naked eye, is curiously shadowy, being, not 

 a compact plate, but a loose collection of rods, almost transparent in 

 some places, thicker in others. Eut though so unsubstantial it is fairly 

 definite in outline, consisting of two plates prolonged into tail-like 

 appendages. The elements (Fig. \b) are longish rods, often wavy and 

 transversely striated, sometimes but not consistently hooked at the tip. 

 The radula consists of 26 rows containing 40-45 teeth on either side 

 of the rhachis. There is no rhachidian tooth, but the first laterals 

 (Fig. 2a) project into the rhachis and almost meet. Thej^ have a few 

 denticles on the outside and on the inside a jagged prominence bearing 

 1 to 3 denticles. The second tooth (Fig. 2b) has a small prominence 

 near the base on the inner side and denticles on the outer side. The 

 succeeding teeth increase rapidly in size until they assume the normal 

 form. This is short, stout, and strongly hamate ; on the outer side of 

 each tooth is a ridge terminating above in a rather blunt point ; in the 

 first 10-15 teeth this ridge bears several (generally about 6) very 

 irregular (Fig. 2c) denticles ; after the fifteenth tooth these denticles 

 disappear, and only the point remains as a single denticle (Fig. 2d). It 



