200 



by the former, with the exception of a narrow area on the posterior 

 left margin. .From the anterior right margin of this area a well- 

 marked cicatricial line runs forward to just above the respiratory 

 and anal orifices, and marks the usual distinct division of the shell- 

 lobes in Helicarion and Durgella and their complete separation, as 

 in Macrochlamys, into a left (frontal) and right (posterior). The 

 dorsal lobes are divided diagonally forward from the respiratory 

 orifice into a large left dorsal lobe and (behind and adjacent to the 

 orifices) a smaller right dorsal lobe ; on the extreme posterior side 

 a slight beading marks the junction of these lobes with the shell- 

 lobes above. This portion of the animal is sunk into a deep, 

 V-shaped, smooth, and unwrinkled depression in the back, where 

 the dorsal ridge of the foot terminates suddenly. Extremity of 

 the foot truncate, with a large linear mucous gland ; the pedal 

 (peripodial) line is very distinct. 



" Eoot divided longitudinally into three subequal median and 

 lateral areas." (Godwin-Austen.) 



Glenitalia as iu Austenia gigas. Radula with tricuspid rhachidian 

 tooth, the broader inner laterals usually bicuspid and the outer 

 laterals with two cusps each, both terminal, thus differing from 

 those in Macrochlamys, Austenia, and Helicarion. 



300. Girasia hookeri, Gray, Cat. Pulm. Brit. Mus. p. 61 (1855) ; 



Godwin-Austen, P. Z. S. 1880, p. 291, pi. 27 ; id. Mol. Ind. i, 



1888, p. 219, pi. 55, figs. 1-1 'b, 2-26 (animal and shell), pi. 60, 



figs. 3, 4, 5 (animal in motion), pi. 62, fig. 1 (teeth) ; ii, 1899, 



p. 104, pi. 88 (spermatophore). 

 Helicarion (Hoplites) theobaldi, Godwin-Austen, P. Z. 8. 1872, 



p. 517. 

 Helicarion shillongense, Godwin- Austen, J. A. S. B. 1875, 2, p. 4, 



pi. 2, fig. 1. 

 Helicarion brunneum, Godwin-Austen, J. A. S. B. 1875, 2, p. 5, 



pi. 2, fig. 2 ; Nevill (Parrnarion), Hand-l. i. 1878, p. 13. 

 Girasia extranea, Cockerell, A. M. N. H. (6) vii, 1891, p. 104 : nee 



Limax extraneus, F6r. 

 Girasia depressa, subsp. of G. extranea, Cockerell, I. c. 



Shell oblong, membranaceous and soft, with a thin olivaceous 

 epidermis, curled up so as to form an incipient spire at one end, 

 drawn out into a broad ribbon-like stripe at the other. Length 

 about 20 mrn. 



Animal varying from pale yellowish dull grey or pale brown to 

 ochraceous or dark umber-brown, sometimes spotted on mantle. 

 The mantle-lobes completely cover the shell, at times leaving a 

 small area exposed ; they also cover a considerable portion of the 

 animal in front of the shell. Length of animal 3 to 4 inches. 



Teeth in radula thus arranged : 95 . 2 . 18 . 1 . 18 . 2 . 95 

 (115 . 1 . 115). Of the broad teeth in the middle of the row the 

 rhachidian has three cusps, the admedian two, one on the outer 

 margin ; all the outer laterals are bicuspid, the two cusps being 

 terminal. 



