102 SYSTEMATIC ARRANGEMENT 



3. M. virgulata, t. 127 a. f. 8. 



4. M. erythrostoma, t. 55. f. 3. 



5. M. truncatula, t. 55. f. 5, 12. 



6. M. uniformis, t. 55. f. 6. 



7. M. spinulosa, t. 55. f. 7. 



8. M. costata, t. 55. f. 8. 



9. M. granifera, t. 55. f. 9. 



10. M. molluceensis, t. 55. f. 10. 



11. M. glans (Melanella gl.), Adams, Gen. Moll. t. 31. f. 4. 



1 2. M. hastata, Adams, Gen. Moll. t. 32. f. 1 ; Fig. Moll. t. 226 a. f. 7. 



The teeth of Melania ? in seven series, 3 • 1 • 3 ; the central 



with five reflexed, rounded denticles ; the outer lateral teeth linear, 

 with the end dilated and edged with rounded crenations. 



2. Melanatria. 



Shell subulate, nodulose; spire acute; aperture roundish ovate, 

 produced in front ; outer lip rather produced in front. Operculum 

 subcircular, of few rapidly enlarging whorls. 



1. M. fluminea. 



2. M. variabilis, t. 127«. f. 7. Melanoides indica, Adams, Gen. Moll. 



t. 31. f. 5. 



3. M. Touranensis, Eydoux, Voy. Bon. t. 31. f. 47. 



3. Pachycheiiajs. 

 Shell conical, smooth, solid ; aperture ovate, roundish ; pillar-lip 

 thickened behind; outer lip thickened. Operculum subcircular; 

 whorls three to four, very rapidly enlarging. — Adams, Gen. Moll. 

 t. 31. f. 7. 



1. P. lsevissimus. 



4. Leptoxis. 



Shell ovate or subglobose, solid, subperforated ; spire short; 

 mouth ovate, rounded in front ; inner lip callous, especially behind ; 

 outer lip sinuous. Operculum half-ovate, subspiral. — Adams, Gen. 

 Moll. t. 22. f. 6. 



1. L. prserosa. 



The Leptoxes are sedentary freshwater animals, living in very 

 rapid streams attached to stones. 



b. Aperture of shell with an indication of a canal in front. 



5. Ceriphasia. 



Shell fusiform, sulcated, covered with a dark green periostraca ; 



whorls angulated in front ; aperture small, produced in front, with a 



groove-like canal; outer lip sinuated behind. Operculum ovate, 



subspiral. 



1. C. sulcata. C. canaliculata, Adams, Gen. Moll. t. 31. f. 6. 



