Hutton. — OwjMarine 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 Eeeve's 

 Conch. Icon., fig. 39). 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 novce-zealandice, Eeeve, is of the list of New Zealand shells obtained 

 by the Novara Expedition. 



Leuconopsis obsoleta, Hutton (Leuconia). 



Dentition, . The teeth are so minute that I have been unable to 



150 



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 Leuconopisis. 



iEoLis leptosoma, n. s. PI. 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, ~ ~ . Each tooth strongly arched, with six or seven cutting 

 points, the central being rather larger than the others. , 



Hab. Lyttelton Harbour, on Sertularians, 



EUTHEIA STRIATA, Hlltton. PI. 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. 



Eutheia flavescens, Hutton. PI. 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. 



