PHILALA.NKA. 21 



35. Philalanka trifilosa, Pfeiffer. 



Helix trifilosa, Pfeiffer, P. Z. S. 1853, p. 125. 



Helix (Trochomorpha) trifilosa, Pfeiffer, Malak. Blatt. ii, 1856, 

 p. 132. 



Original description : " T. perforata, depresse trochiformis, 

 tenuis, radiato-striata, acute carinata, vix nitidula, pallide cerea ; 

 spira conoidea. apice hyaliaa obtusula; sutura marginata; anfr. 

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

 muniti, ultiraus non descendens, basi convexior, nitidus ; apertura 

 verbicalis, depressa, angulato-lunaris ; perist. rectum, acutum, 

 marginibus remotis, supero brevissimo, basali leviter arcuato, 

 colinnellari deelivi, superne dilatato, reflexo. 



" Diam. maj. 5|, min. 5, alt. 3| mill." 



Hab. Ceylon (Thwaites). 



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. 



36. Philalanka ? mononema, Benson. 



Helix mononema, Benson, A. M. N. H. 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 ( Trochomorpha) mononema, Pfeiffer, Malak. Blatt. ii, I860, 



p. 132. 



Nanina (Microcystis} mononema, Nevill, Hand List, i, 1878, p. 41. 

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



fig. 6 ; Tryon, Man. Conch, ser. 2, ii, 1886, p. 57 (monomena, err. 



typ.), pi. 25, fig. 33. 

 Philalanka ? mononema, Godwin- Austen, Proc. Malac. Soc. London, 



iii, 1898, p. 12. 



Original desertion : " T. angustissime perforata, trochi- 

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

 spira conica, apice acutiusculo ; sutura distincta ; anfr. 6|-7 sub- 

 sequales, superne convexiusculi, filo unico elevato, tenui, mediano 

 cincti, ultimus acute filoso-caririatus, subtus subplanulatus ; 

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

 marginibus distantibus, columellari brevi, verticali, reflexo, per- 

 forationem subtegente. 



" Diam. maj. 5, min. 4|, alt. 4| mill." (Benson.} 



Hab. Ceylon : Heneratgodde (Layard) ; Balapiti (Nevill). 



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

 with a more convex spire. The figure given of the species by 

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

 more like the one in Conch. Ind. 



