GORILLA. 



53 



Subfamily CORILLIN.E. 



Genus CORILLA, Adams. 



Gorilla, Adams, Gen. Rec. Moll, ii, 1855, p. 208 ; Semper, Eeisen 

 Arch. Pbilippinen, Wiss. Res. 2, iii, 1870, p. 100 (anatomy) ; 

 Pilsbry, Man. Couch., ser. 2, ix, 1894, p. 147 (anatomy) ; Gude, 

 Science Gossip, n. s. iii, 1896, pp. 88, 126 (armature); Pilsbry, 

 Proc. Mai. Soc. London, vi, 1905, p. 288 (anatomy) ; Godwin - 

 Austen, Moll. India, ii, 1907, p. 199 (anatomy). 



Atopa, Albers, Die Heliceen, 1850, p. 90 (in part). 



" Shell i^lanorhoid, wiili nearly plane spire and hroadhj open 

 umbilicus, the contour subcircular or oblong ; rather solid, striated 

 above, brown or yellow. Whorls 5-5|, the last deflected in front. 

 Aperture oblique, tlie Up hroadhj reflexed or recurved, its ends 

 distant ; parietal wall smooth or armed with a strong entering 

 lamella, luterior of the last wborl either without laminae or 

 obstructed by a series of blades nearh/ parallel to the direction of 

 the whorls, hut having no transverse harriers. 



" Toot (of C. erronea) with undivided sole and without pedal 

 grooves. No mantle lappets. Kidney very short. 



" Jaw entirely smooth. Radula with about 79-85 teetb in a 

 transverse row. Central tooth not smaller than the laterals, 

 having a single cusp, shorter than the basal plate. Laterals 

 similar but asymmetrical. Marginals having a large, simple, 

 oblique cusp longer than the square basal plate. 



"Genital system elongated, with no accessory organs on the 

 female side. Spermatheca having a long duct, which branches 

 into a very long Jiacjellum-like diverticidum, containing a cylindrical 

 spermatophore,\vhich extended from the end of the diverticulum 

 to the vagina. Penis short, swollen distally, continued in the 

 vas deferens upon which the penis retractor is situated, the distal 

 end of the retractor being inserted, on the uterus. This species 

 [C. erronea'] is ovoviviparous, the uterus in the individual figured 

 containing two young, having a membranous shell of about 

 5 mill, diam., and more than 3 whorls. 



" The shell differs from that of Plectopylis in lacking internal 

 barriers transversely obstructing the passage. AVhen internal 

 lamellse are present in Corilla they run parallel to the sutures or 

 nearly so, as in Pohjggratia. The central teeth are not smaller 

 than the laterals as in 'Plectopglis, and there are further diflferences 

 in the genitalia." (Pilsbry.) 



TiPE, Helix erronea, Albers. 



Range. Ceylon ; Southern India (1 species). 



When examining the soft parts of Corilla humberti in 1905, Prof. 

 Pilsbry found that the additional data obtained threw no light upon 

 the affinities of the groups with other Helicidse. He further states 

 that the suspicion he formerly entertained that Corilla might be 

 related to the Macroiigona is negatived by the knowledge we now 



