Hurron.—OniMarine Mollusca. 213 
Hab. Auckland, Napier, and Wellington. 
In adult specimens the shell is irregularly longitudinally ribbed, but in 
the young these ribs are absent, and it has then either been mistaken for 
O. australis, Q. and G., or has been considered distinct, and has been 
named Laimodonta quoyi by Adams (= Auricula quoyi, Sowerby, in Reeve's 
Conch. Icon., fig. 89). The animal has not yet been described. 
Melampus commodus, Adams; M. zealandicus, Adams; M. sulcatus, Adams; 
and M. adamsianus, Pfeiffer, are not, I believe, found in New Zealand; the 
two latter come from Australia and New Caledonia. I do not know what 
Melampus nova-zealandia, Reeve, is of the list of New Zealand shells obtained 
by the Novara Expedition. 
Levoonopsis ossoLetA, Hutton (Leuconia). 
Dentition, — . The teeth are so minute that I have been unable to 
make them out distinctly with a sixteenth objective. 
This species is found under stones between tide-marks at Auckland. It 
is distinguished from all the European species by having only one plait on 
the inner lip ; consequently it should, I think, be formed into a separate 
genus for which I propose the name Leuconopsis. 
MoLis LEPTOSOMA, n. s. Pl. xi., fig. 2. 
Animal small, elongated, the tail rather short, pointed ; minute eyes 
behind the tentacles. Tentacles four, subulate, the oral pair distant at 
their bases. Gills as long as the breadth of the animal, crowded, in about 
twelve transverse rows on each side of the back. Foot rather expanded, 
the margin thin, not crisped nor produced in front. Colour yellowish- 
white with some thin lines of reddish-yellow on the head and back ; gills 
brownish-grey, tipped and slightly margined with white. Length ‘4 
inch. 
Dentition, 0—1— Each tooth strongly arched, with six or seven cutting 
points, the central being rather larger than the others. 
Hab. Lyttelton Harbour, on Sertularians. 
Evrsrm strata, Hutton. Pl. xi., fig. 3. 
Dentition. Central tooth strongly curved, the ends bent backward; a 
single tricuspid cutting point in the centre. Laterals with three subequal 
and equidistant blunt points. 
Hab. Lyttelton Harbour. 
EUTERIA FLAVESCENS, Hutton. Pl. xi., fig. 4. 
E. lineata, var. D. Man. N.Z. Mollusca, p. 51. 
Dentition. Central tooth deep, slightly hollowed behind, the ends broad 
and not bent backward; a single tricuspid cutting point in the centre. 
Laterals with three points, of which the outer is the largest, and divided by 
a considerable space from the middle point, which is the smallest. 
