274 MR. E. A. SMITH ON THE MOLLUSCA [May 6, 



specimens from New Caledonia identified with it by Gray were 

 wrongly determined, for on examining the horny jaw of some of 

 these, they prove to be quite different from that represented by Mac- 

 donald (Ann. & Mag. Nat. Hist. ser. 2, vol. xviii. (1856) p. 38), but 

 exactly like the figure given by Keferstein of Triboniophorus krefftii. 

 The length and distinctness, or even the total absence of the central 

 longitudinal groove, and those diverging obliquely from it, appear in 

 a great measure due to the manner in which the animal contracts or 

 distends its skin at the time of death. Among the eleven specimens 

 from New Caledonia in the British Museum, this variation is clearly 

 evident, some showing the furrows very strongly, others in a less 

 degree, and in two instances they are totally wanting. T. krefftii, 

 with its rugose skin and peculiar lingual dentition, appears clearly 

 distinct from the other species, although all the described forms, in- 

 cluding the Aneitia, have been considered (perhaps correctly) by 

 Heynemann one and the same species. 



Neritina souverbiana, Montrouzier. 



Hab. Flinders Passage, North Australia, in 7 fathoms. 



This species, as far as at present known, does not inhabit fresh 

 water. It has been previously recorded from Port Jackson and New 

 Caledonia, and being marine may even have a wider range. 



New Zealand. 



Examples of five species of land and freshwater shells from Waira- 

 rapa, Wellington, were presented to the Expedition by Mr. W. T. 

 Locke Travers. They are : — Latia neritoides, Gray ; Helix coma, 

 Gray ; H. glabriuscula, Pfeiffer ; and two species of Helix which are 

 apparently undescribed. 



Helix (Thalassia) traversi. (Plate XXIII. figs. 16-16 b.) 



Shell depressed, subconoid, keeled, narrowly perforate, thin, 

 corneous, somewhat glossy, ornamented with fine light red wavy and 

 very oblique lines, which are invisible in certain positions and best 

 seen when the specimen is held up to the light. In addition to 

 these lines there are pale reddish spots beneath the suture. "Whorls 

 5j§, rather slowly enlarging, a little convex, sculptured with fine 

 arcuate oblique lines of growth, which are cut across by close-set 

 minute spiral stria?, both on the upper and under surfaces ; last 

 whorl moderately sharply keeled, convex beneath, and painted with 

 fine wavy more or less zigzag light red lines radiating from the per- 

 foration to the periphery. Aperture oblique, sublunate. Peristome 

 thin, a little thickened, expanded and reflexed in the columellar 

 region. 



Greatest diameter 11| millim., smallest 10, height 7|. 



This species must not be confused with H. zelandies, to which it 

 is closely related. It is a larger shell, more narrowly perforate, and 

 at once known by its minute spiral stria?. 



