GORILLA. . 59 



represents the shell with the outer wall removed, discloses the 

 fact that only two parietal folds are present, corresponding to 

 the median and lower folds of the species possessing three folds ; 

 both are visible from the aperture (see fig. 15 b). The median 

 fold reaches to the parietal callus, and is long and irregularly 

 flexuous, while the lower fold is very short. Of the four palatal 

 lamellae, the first arid second only are visible from the aperture. 

 The first, second, and third are broad, and ascend obliquely 

 parallel to each other, while the fourth is smaller, narrower, and 

 revolves horizontally, parallel with the lower suture. Fig. 15 a 

 shows all six barriers from behind their inner terminations. 



69. Gorilla anax, Benson. 



Helix anax, Benson, A. M. N. II. ser. 3, xv, 1865, p. 12 ; Hanley & 



Theobald, Conch. Ind. 1870, pi. 57, figs. 1-3. 

 Helix (Corilla) anax, Nevill, Hand List, i, 1878, p. 70. 

 Helix (Atopa) anax, Tryon, Man. Conch, ser. 2, iii, 1887, p. 157, 



pi. 33, figs. 16-18. 

 Corilla anax, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 148 ; Glide, 



Science Gossip, N. s. iii, 1896, p. 126, fig-. 12 (shell and armature). 



Original description. " H. testa late umbilicata, subovato 

 discoidea, utrinque concava, solidula, superne oblique costulato- 

 striata, subtus striata, nitidiuscula, f usco-castanea, subtus Isetiore ; 

 spira immersa, apice elevatiuscula, sutura subprofunda; anfracti- 

 bus 5, primis convexiusculis, ultimo convexo, antice descendente, 

 dilatato, deflexo, ad diametrum minorein angustiore ; apertura 

 perobliqua, rotundato-oblonga, larnellis 2, parietalibus, albis, 

 superiore longe intrante, sinuata,inferiore obliqua sinuata, breviore, 

 ab apertura remotiuscula, palatalibus 3, longiusculis, subprofundis 

 obliquis parallelis ab apertura conspicuis extus perlucentibus 

 coarctata ; peristomate casruleo-albido, subcallosa, breviter reflexi- 

 usculo, marginibus callo albido junctis, inferiore subdentato- 

 incrassata. 



" Diam. maj. 23, min. 17J, axis 8 mill., apertura lata vix 10, 

 longa 9 mill." (Benson.} 



Hob. India : Travancore ; Anamullay Hills (Beddome). 



This is the only species of Corilla known to occur outside 

 Ceylon, being found in the southern part of India. It is of a 

 dark chocolate colour, and possesses three parietal and four 

 palatal plates. Eig. 1 6 a shows the entire shell, four of the plates 

 two parietal and two palatal being visible from the aperture. 

 The parietal plates are much broader than in the other species, the 

 first curves upwards, while the second reaches as far as the parietal 

 callus ; but, unlike those of the other species, they are separate. 

 The third parietal plate is almost horizontal, with but a slight curve, 

 as will be seen on reference to fig. 16 c, the specimen being there 

 figured with the outer wall removed. Fig. 16 d shows the same 

 shell with part of the outer wall broken away, and the plates are 

 shown as they appear from behind their inner terminations. The 



