190 LAND AND FRESHWATER 



be termed a multiplacognathous jaw. The radula (fig. 2 a) has this 

 arrangement of the teeth : — 



21 . 21 . 1 . 21 . 21 

 42 . 1 . 42. 



The centre tooth is small, straight-sided, with no basal cusps, on a 

 long narrow oblong plate. Up to the 10th adraedian the teeth are 

 similar in form ; there is only an indication of an outer cusp. At 

 the 20th this outer cusp is more pronounced, and is retained even 

 in the outermost laterals or marginals, represented by the minute 

 tooth on the outer side of the two large double teeth. At the 18th 

 tooth an inner upper cusp is also seen, which rapidly becomes 

 nearly evenly bicuspid up to the outermost laterals. The plates of 

 these last are narrower and square in shape. This radula at once 

 recalls that of Philalcmha. 



Nevill, in the Hand-list of the Indian Museum Collection, 

 Calcutta, placed in the genus Thysanota the following species: — 

 fjuerini, Pfr. ( = eriu{r/era, Bs.). specimens from the Nilghiris 

 and Tinnevelleys ; tahida, Pfr., Nilghiri Hills. 



In his MS., 2nd edition, he brought into the catalogue three 

 more species in the collection : — (1) crinigera, which he appears 

 afterwards to consider distinct from T. guerini, obtained by 

 Col. Beddome and Dr. Blanford from the AnamuUays, Aggamullays, 

 and Nilghiris respectively ; (2) hyha, Benson, from Dakhiu Xlioond 

 near the Sutlej River, with the note " Rather scarce near Dalhousie 

 and Chamba over 0000 ft., fiile Theobald, J. A. S. B. 1878 " (caret 

 in pencil) ; (3) biciliaia, Pfr., Ceylon (caret in pencil). 



Thysanota hispida, Sykes. 



Thysanota hispida, Sykes, Proc. Malacol. Soc. Lond. vol. iii. 

 No. 3, Dec. 1898, p. 160, pi. x. figs. 2a-c (paper read June 1898). 



Original description : — " Testa trochiformis, j^^'^'iostraco fusco, 

 rugoso, induta, basi impressa, umbilicus angustus, pervius ; apex 

 mediocris, ap>planatus ; anfr. 6-6g, convexi, lira unica spiraliter 

 sculjiti, ultimus basi carinatus, lira carinaque p>ilis longis densce 

 notatce, apertur-a lata, lunaris ; peristoma simplex, marginihv.s callo 

 tenuissime junctis. 



" Diam. max. 8, alt. 5 mm. 



" IJab. Haputale, at 4500 ft.; Ceylon (0. Collett). 



" This species appears to be closply related to 'Thysanota guerini, 

 Pfr., from the Nilgherries, but differs somewhat in shape, as also in 

 size ; the single spiral thread cloihed with club-shaped hairs 

 (fig. 2 c) is specially noteworthy. The basal carination is con- 

 tinued, and marks the suture of the upper whorls." 



Subgenus Philalanka. 



Philalanha, Godw.-Austen, Proc. Malacol. Soc. Lond. vol. iii. 

 pt. i. pp. 11-13 (April 1898). Type P. seccssa, pi. i. figs. 1-5. 

 Original description of the subgenus: — "Jaw composed of numerous 



