HELIX-PAPUINA. 61 



violaceous, upper margin expanded, impressed above, columellar 

 margin straightened, dilated, flat, appressed. Alt. 15, greater diam. 

 28, lesser 23 mill. (P/r.) 



Habitat unknown. 



H. rhombostoma PFR., P. Z. S. 1845, p.' 72; Monogr. i, p. 231. 

 RVE., Conch. Icon., f. 1456. 



This form has not been noticed by recent writers. It is apparently 

 intermediate between H. strabo Braz. and H. louisiadensis Forbes, 

 approaching rather near to the var. katauensis of the former. Should 

 be looked for in Southern New Guinea and adjacent islands. 



H. GURGUSTII Cox. PI. 1, fig. 16 ; PI. 14, figs. 68, 69. 



Shell imperforate, broadly conoid, white, diaphanous, opaque, 

 shining, granular on the surface, whorls five, gradually increasing 

 in size, flat, last sharply angled at the periphery, pinched and 

 everted at the peristome, reflexed at the insertion ; base flat ; peri- 

 stome bright-pink, Innately elongated, margins approached, everted 

 and beaked at the center ; aperture white within. 



Diam. greatest I'lO ; least 0.84 ; height 0'80 of an inch. 



This fine species is in the Hargravesian Collection in the Austra- 

 lian Museum ; it is the same kind of shell as Helix Louisiadensis of 

 MacGillivray, but is a larger species, easily distinguished from that 

 species by its white diaphanous aspect, light-pink peristome and by 

 the absence of the characteristic oblique fine striae on the surface of 

 the whorls. ( Cox.) 



Russell Island, Louisiade Group. 



H. (Geotrochus) gurgustii Cox, Proc. Linn. Soc. N. S. Wales, iv, 

 p. 114, t. 16, f. 1, 1879 ; 1. c. 2d. Ser. ii, p. 1063, t. 2, f. 3, 4. 



H. LOUISIADENSIS Forbes. PI. 4, figs. 61, 62, 63. 



Imperforate, depressed-turbinate, about equally convex above and 

 below the periphery ; spire low-conic, apex obtuse ; whorls 4|-4f , 

 slightly convex, the last whorl somewhat angulated in front, becom- 

 ing rounded, abruptly deflexed to the aperture, a little constricted 

 behind the pink lip. 



Surface shining, obliquely striatulate, and covered with a close fine 

 sculpture of forward-descending wrinkles. Ground-color, corneous- 

 white or pink, having an opaque-white peripheral girdle, above ob- 

 liquely streaked in a very irregularly broken pattern with light brown ; 



