PIIIL.VLAXKA. 21 



35. Philalanka trifilosa, Pfeiffer. 



UdLv trifilom, Pfeiffer, P. Z. S. 18o;J, p. ]-2n. 



Helix {Trochomo)-j)ha) trifUosa, PfeillV;!-, .Malak. P>liilt. ii, I80G, 

 p. 132. 



Original description: — " T. perforata, depresse trochiforiai-, 

 tenuis, radiato-striafca, acute carinata, \'\x nitidula, pallide cerea ; 

 spira coaoidea, apice liyaliiia obtusula; sutura marginata; anfr. 

 6|, convexiusculi, arete convoluti, superue carinis 3 filiformibus 

 muuiti, ultimus non descendens, basi coavexior, nitidus; apertura 

 verticalis, depressa, augulato-lunaris ; perist. rectum, acutum, 

 marginibus remotis, supero brevissirao, basali leviter arcuato, 

 coluinellari decliv'i, .superne dilatato, reflexo. 



•' Diam. maj. 5|, niin. 5, alt. 3| mill." 



1 1 ah. Ceylon (Tluvaites). 



This species, described from the Cuming Collection, has never 

 been figured. Unfortunately, in spite of a diligent search for the 

 type, Mr. E. A. Smith, until lately Assistant- Keeper of Zoology 

 at the Natural History Museum, has failed to trace its where- 

 abouts. 



3(;. Philalanka ? mononema, Bemon. 



Helix mononemd, Benson, A. M. X. II. ser. 2, xii, 1853, p. 92 ; 



Reeve, Conch. Icon, vii, 1854, pi. 191, fig. 1339; Hanley & 



Theobald, Conch. Ind. 1874, pi. 87, figs. 2 & 3. 

 Helix ( Tvochomorpha) mononema, Pfeiffer, Malak. Blatt. ii, 185<>, 



p. 132. 

 Nanina {Microcystis) mononema, Nevill, Hand List, i, 1878, p. 41. 

 Sitala mononema, Gorlwiu-Austen, Moll. India, i, 1882, p. 41, pi. 9, 



fig. 6 ; Trvon, Man. Conch, ser. 2, ii, 1880, p. 57 {monomcna, err. 



typ.), pi. 25, Hg. 33. 

 Philalanka r" mononema, Godwin-Austen, Proc. Malac. 80c. London, 



iii, 1898, p. 12. 



Orir/inal descrijition : — " T. angustissime perforata, trochi- 

 formis, radiato-striatula, corneo-albida, parum nitida, translucens; 

 spira conica, apice acutiusculo ; sutura distincta ; anfr. 0|-7 sub- 

 aequales, superne convexiusculi, filo uuico elevato, tenui, mediano 

 cincti, ultimus acute filoso-carinatus, subtus subplanulatus ; 

 apertura verticalis, depresse securiformis ; perist. rectum, acutum, 

 marginibus distantibus, columellari brevi, vertical], reflexo, per- 

 forationem subtegente. 



'•Diam. maj. 5, min. 4|, alt. 44 mill." (Benson.) 



Bab. Ceylon: Heneratgodde (Z^frya/rZ) ; Balapiti (A'evi/Z). 



Kesembles P. secessa in shape, but is somewhat smaller and 

 with a more convex spire. The figin-e given of the species by 

 Godwin-Austen differs considerably from that of Keeve, but is 

 more like the one in Conch. Ind. 



