176 Mr. W. H. Benson on a new Species of Helix. 



and Bibiliganma ones exhibiting a chestnut colour, and those 

 from Bandarewella having a paler reddish hue. A single speci- 

 men from Fort M 'Donald has a fifth short and oblique lamella 

 between the two central ones, evidently an accidental formation. 

 The form of the aperture, that of the palatal lamellse, the fewer 

 whorls, and the colour as well as the conformation of the upper 

 and lower sides distinguish the species from the Travancore 

 H. Anax, notwithstanding the presence, as in that shell, of only- 

 two parietal lamellse. 



I have compared sixteen specimens of the new species with 

 forty-seven of H. erronea. Two of them, opened, prove that 

 there is no upper parietal lamella in the whole length, invariably 

 to be detected from the aperture in H. erronea. 



There are now six species known of the Ceylon and Travancore 

 form, as separated from the Burmese Rlectopylis. 



In the 'Annals of Natural History' for August 1859, 1 stated 

 that the Burmese H. Achatina, Gray (Picctopylis, nobis, Annals, 

 April 1860), associated by Pfeiffer with the distinct type of H. 

 Rivolii, under the name of Ophiogyra, and by H. Adams under 

 that of Corilla, was ovoviviparous, and remarked that it would 

 be interesting to know whether H. Rivolii, &c, were similar 

 in habit. Mr. F. Layard now informs me that H. Rivolii and H. 

 erronea are not ovoviviparous. 



In the note to H. Anax, mihi (Annals, Jan. 1865), I referred 

 to Bi'ot ; s statement that four, and not three, palatal lamella? 

 occur in H. Rivolii and H. erronea. Brot omitted to refer to my 

 discovery of this circumstance, recorded in the ' Annals' for 

 April 1860, in the paper on Picctopylis. 



The lamellae figured in plate 2. fig. 8, of H. erronea, in the 

 r Journal de Conchyliologie' for 1864 are incorrectly drawn, 

 the connivent parts of the two upper palatal ones being placed 

 at the ends towards the aperture, instead of at the points most 

 remote from it — a feature also observable in H. Rivolii. I have 

 not seen a specimen of H. Humberti ; but there can be no doubt, 

 from the alleged resemblance of the single palatal lamella to the 

 basal one in H. erronea (which, however, does not come in con- 

 tact with the suture), that it diverges from it in the wrong direc- 

 tion in fig. 6. In H. Rivolii the basal palatal lamella is nearly 

 parallel with the suture. 



A single large specimen of H. Rivolii, in Mr. F. Layard's 

 collection, from Moopane, has the two upper palatal lamellse 

 closely approaching the outer lip. Palatal lamellse occur at the 

 beginning of the last whorl in H. odontophora and H. erronea. 



Cheltenham, Jannuary 30, 1865. 



