134 PELLA. 



T. (VIDENA) BOETTGERI Mlldff., Nachr.-Bl. d. d. Mai. Ges. 1891, 

 p. 201. Tablas and Romblon, Philippines (= Tr. conomphala 

 Hidalgo, Journ. de Conch. 1887, p. 94, non Pfr.) 



HELIX SWETTENHAMI de Morgan, Le Naturaliste, 1885, p. 68. 

 Perak. May be a Plectotropis. 



T. SUBTRICOLOR J. Mabille, Moll. Tonk. diagn. p. 7, May 14, 

 1887 ; Bull. Soc. Mai. Fr. iv, p. 96. Tonquin. 



H. DICTYONINA Euthyme, Bull. Soc. Mai. Fr., ii, p. 257, 1885. 

 Noumea, N. Caledonia. Probably a var. of H. dictyodes Pfr., or 

 of H. mouensis Crosse. 



TR. BINTUANENSIS Hidalgo, Obras Malacol. i, p. 116. Penon de 

 Bintuan, Busuanga, Philippines (Quadras}. Closely allied to Tr. 

 splendens Semp., but differing in the rapid increase of the last volu- 

 tion. 



TR. CROSSEI Hidalgo, 1. c., p. 117. Same locality. 



TR. BAGOENSIS Hidalgo, 1. c., p. 118. Banks of the river Bago, 

 island of Negros, Philippines (Quadras'). 



T. THEMIS Garrett, P. Z. S. 1887, p. 177. Vanua Balavo and 

 Oneata, Viti Is. (= Tr. (Discus) ludersi Mouss., Journ. de Conch. 

 1870, p. 122, part, not of Pfr.). 



TR. PULCHERRIMA Hartman, Proc. Acad. Nat. Sci. Phila. 1890, 

 p. 228, pi. 3, f. 13 (N. Hebrides), belongs to the Zonitidse. 



HELIX SWETTENHAMI de Morgan, Le Naturaliste 1885, p. 68, is 

 either a Trochomorpha or a Plectotropis. 



TR. STAUDINGERI Ancey, Bull. Soc. Mai. Fr. vii, p. 145. Sangir 

 Is. Allied to Tr. lardea Mts. 



POECILOZONITES (III, p. 95). This group has been shown by 

 the writer to belong to the Zonitidce. See Proc. Acad. Nat. Sci. 

 Phila. 1888, p. 285. 



PRISTILOMA, Vol. Ill, p. 102. H. lansingiand H.dearmi should 

 be removed from the Helicidse. They form the genus Pristiloma 

 Ancey, in the Zonitidce. 



PELLA (Vol. Ill, p. 103). As constituted by Albers (Die Hel.), 

 and followed by Pfeiffer (Nomencl. Hel. Viv.), and by Tryon, this 

 group contains a number of very incongruous forms, as follows : 



