1885.] FROM THE SOLOMON ISLANDS. 605 



52. Neritina dubia, Chemnitz. 



Hab. From a stream, Shortland Islands. 



The single specimen from this locality is of a dark olive tint, 

 marked with slender zigzag black lines very closely packed together 

 except upon the last half of the body-whorl, which is destitute of the 

 black lineation but is quite distinctly spirally ridged, the ridges 

 being about as fine as in N. subsulcata. 



53. Neritina adumbrata. Reeve. 



Hab. A stream in Choiseul Bay, and found living on the sides of 

 a deep ravine worn by a stream iu a soft calcareous rock, Ugi Island. 



N. cuvieriana of Reeve (Conch. Icon. sp. 87), which may not be 

 the form described by Recluz under that name, is certainly the 

 same as this species. The specimen figured in the ' Conchologia 

 Iconica ' (figs. 5/ a, b), is not half the size of some of the shells 

 collected by Mr. Guppy. The figures are not good, and do not 

 convey the shape correctly. The aperture narrows in front, and the 

 columella is less sharply sinuatedin the middle, and finely crenulated 

 along the edge. As in some other species, the colour is rather 

 variable, some examples appearing at a distance uniformly dark 

 olive, but on closer inspection, especially on the upper whorls, 

 exhibit spotted markings. Others are distinctly mottled and spotted 

 all over, whilst others again are transversely banded. The red stain 

 on the colluniella is present in most specimens, but is only feebly 

 indicated in some of the smallest. The operculum is white or of a 

 flesh tint on the outer surface, and generally has a livid stain at the 

 nucleus. It is rather smooth, exhibiting fine lines of growth and a 

 few feeble longitudinal striae. The inner surface is of a darker flesh 

 tint, and has a slightly elevated pale obsolete ridge curving from 

 the nuclear end to the middle of the columellar or straight side. The 

 outer curved margin is also a little thickened within. The erect 

 process is rather slender. The largest specimen has an extreme 

 length of 34 millimetres. 



54. Neritina pulligera, Linne. 



Hab. Choiseul Bay and Ugi Island (Guppy); Guadalcanar 

 Island {Mucgillivray) ; and San Christoval (BrenrMey). 



Of the two specimens from Ugi one is peculiar in having only a 

 slight trace of the orange-red colour of the aperture. In addition 

 to the localities cited by Martens in his monograph of this genus 

 (Conch.-Cab. ed. 2, p. 51), I might mention Queensland, Austraha, 

 on the authority of Tenison- Woods, and of a specimen in the British 

 Museum presented by Mr. Wickham. 



55. Neritina petiti, Recluz. 



Hab. Treasury and Faro Islands. 



This species also occurs at the Fiji Islands, where it was collected 

 by Macgillivray. Its further distribution has been given by Martens 

 in the Conchvlien-Cabinet. His surmise that N. californica of 



