GLESSULA, NON-PENINSULAR INDIA TO INDO-CHINA. 95 



69. G. ILLUSTRIS Godwin- Austen. PI. 11, figs. 13-16. 



"Shell elongately oval, greenish horny, finely striated lon- 

 gitudinally; whorls 7, very slightly rounded, suture moder- 

 ately impressed, the lip thickened, eolumellar margin slightly 

 curved and strong, apex blunt. Length 0.75 major diam. 0.3 ; 

 length of aperture 0.3 mm." (G.-A.) 



North Cachar Hills: Hengdan Peak, at 7000 feet, in for- 

 est; also near Nenglo at 6000 feet and in the Lukah Valley, 

 Jaintia Hills, at 1000 feet. 



Achatina illustris Godwin-Austen, HANLEY & THEOBALD, 

 Conch. Ind. pi. 102, f. 9. Glessula illustris G.-A., J. A. S. B. 

 1875, vol. 44, p. 3, pi. 1, f. 5. A. illustris PFR. Monogr. 

 viii, 279. 



"This species is an elongate and larger form of Glessula 

 crassilabris Bs., of which G. pyramis is a closer variety; but 

 its much more elongate form and stronger striation make it 

 a good connecting species with G. butleri described further on. 

 The form from the Lukah Valley is a tumid departure from 

 the type figured. Alt. 0.75, major diam. 0.38 inch. Alt. 

 0.65, major diam. 0.35 inch." 



"I look on all these species as properly varieties, and 

 G. crassilabris, very abundant in all the grass country of the 

 Khasi Hills, may be taken as the type; a difference in eleva- 

 tion and condition of habitat, from damp dark forest to hot 

 grassy slopes, having produced modifications of form." 

 ( Godwin-Austen. ) 



Figs. 15, 16, are copied from Godwin- Austen 's originals. 

 A typical specimen, length 18.75, diam. 7.8, aperture 7.5 mm., 

 whorls slightly over 7, is shown in figs. 13, 14. The em- 

 bryonic whorls are closely and finely striate vertically, as in 

 G. notigena; hence the species has no affinity to G. crassilabris. 

 It is a much less robust shell than G. crassilabris, and less 

 polished ; and on the last whorl there are traces of fine spiral 

 striation, as shown in fig. 13. The sculpture of the later 

 whorls is irregular; there seem to be unequally separated 

 grooves, with finer strige and grooves in the intervals, but 

 quite unequally developed. The suture is crenulate. On the 

 last whorl or two some traces of spiral striae appear, in places. 



