1885.] FKOM THE SOLOMON ISLANDS. 591 



7. Helix (Geotrochus) gamelia, Angas. 



Sab. Shortland and Treasury Islands in the straits between Bou- 

 gainville aud Choiseul Islands {Guppy) ; Stephen and Ysabel Islands 

 \Angas). 



8. Helix (Geotrochus) hargreavesi, Angas. 



Hah. Faro Island, also between Bougainville and Choiseul 

 Islands. Found in the higher parts of the island up to the summit, 

 1900 feet above the sea. 



This and the preceding species are very closely related, the colour 

 and disposition of the bands being almost the same. H. hargreavesi 

 may, however, be recognized by its more elevated conical form, the 

 much broader band on the base of the body-whorl, the blackish- 

 brown peristome, the dark-coloured callosity overspreading the 

 umbilical region, and the peculiar oblique columellar margin, which is 

 thickened and almost subtruncate anteriorly where it falls within 

 the outer edge of the lip, which is fused above with the spreading 

 umbilical callus. In H. gamelia the last whorl does not descend in 

 front, whereas in the present species it takes a rather sudden 

 and considerable turn downwards. 



9. Helix (Geotrochus) mendana, Angas. 

 Hab. Shortland Island, Bougainville Straits. 



In the Proc. Zool. Soc. 1867, p. 889, Angas gave Ysabel Island 

 .<(s the locality of this species, but he subsequently presented two 

 specimens to the British Museum from Bougainville Island. 



10. Helix (Geotrochus) motacilla, PfeifFer. 



Hab. Simbo Island, south of Choiseul Island. 



Eddystone Island, where this species was originally discovered, also 

 belongs to the Solomon, and not to the Admiralty group as stated by 

 Pfeiffer. The specimens brought home by Mr. Guppy belong to 

 the variety ornamented with four spiral bands upon the body-whorl, 

 two above and two below the middle, of which the two nearest the 

 somewhat carinate periphery appear to be invariably of a darker tint 

 than the rest. 



11. Helix (Geotrochus) GUPPYi. (Plate XXXVI. fig. 4.) 



Shell elevately conical, thin, pale yellow, . ornamented with con- 

 spicuous nearly black or black-brown spiral bands, one above and 

 one below the sutures of the upper whorls, and three upon the last, 

 one sutural, the second peripheral, and the third basal. Volutions 

 6, rather slowly enlarging, a little convex, sculptured with fine 

 oblique striae of growth, not glossy. Three first whorls livid pur- 

 plish, the last rather sharply angled at the middle, not descending 

 in front, having the basal baud broad around the almost concealed 

 perforation, and obsolete within the aperture. The latter is obliqMe, 

 somewhat narrowed and pouting in front, banded within with three 

 almost black and two white bands, the central one of the former 

 being squarely truncate at the end, only the lower corner of it 



