270 OBBA-CHLORITIS. 



Genus OBBA Beck (Vol. VI, p. 211.) 

 Obba BECK, Index, as restricted by GRAY, P. Z. S. 1847, p. 172. 



In vol. VI of this work, the writer adopted the Helix mamilla as 

 the type of Obba, following von Martens. This was done in igno- 

 rance of the fact that in 1847 Gray had selected the first species 

 enumerated by Beck, H. planulata, as the type of the genus. It is 

 obvious, therefore, that this species must remain the type, notwith- 

 standing Martens' subsequent selection. The name Obbina Semper 

 falls as a synonym, together with the undefined and twice pre- 

 occupied term Gallina Hartm., proposed for H. rota. 



The Papuan species oxystoma Smith, bevani Braz., elisus Hedley, 

 pelechystoma Canefri, carinata Hombr., are intermediate between 

 Papuina and Obba in shell characters. Until the anatomy is known, 

 we will not be able to finally classify them generically. 



OBBA GALLINULA Pfr. (Vol. VI, p. 219.) 



Var. morongensis Mlldif. Shell smaller, more narrowly umbilic- 

 ated, the whorls more convex ; last whorl swollen below, begirt above 

 and below the carina with a wider band, the bands regularly lacer- 

 ated, variegated with yellowish ; rest of the shell unicolored yellow. 



Alt. 8*-9, diam. 21-27 mill. (Mild/., Nachr.-Bl. 1889, p. 103.) 



Mis. of Morong, Luzon. 



Genus CHLORITIS Beck. 



Chloritis PILSBRY, Manual vi, p. 242. MLLDFF., P. Z. S. 1891, 

 p. 335, 336. 



The most useful shell character of this genus is the regular 

 arrangement of granules or hair-points on the apical whorl, which 

 is moreover flattened or sunken, the whole spire often being sunken. 

 This regular arrangement of granules sometimes persists upon the 

 body-whorl, but its regularity is frequently lost upon the later whorls. 

 The criterion established by T. Mollendorff (I. c.) cannot therefore be 

 sustained when large numbers of species are examined. Many 

 Chloritis have no quincuncial arrangement of granules or hairs on 

 the body-whorl. Mollendorft's section Pareulota is probably a 

 synonym of A ustrochloritis ; at all events no diagnostic characters 

 separating it have been given. The lack of accessory glands upon 

 the vagina sunder this genus widely from Eulota, which has, more- 

 over, a smooth apex, even when the adult is hirsute. 



