OF MOLLUSCA. 



107 



6. Pyrazus. 



Shell turrited; whorls rugose, granulated, variced; mouth sub- 

 quadrate ; canal short ; pillar with a central prominence ; lips con- 

 tinuous, outer dilated. Operculum circular, of many whorls. — Adams, 

 Gen. Moll. t. 30. f. 6 a-8 a. 



1. P. palustris, t. 54. f. 4, t. 127. f. 6, t. 267. f. 2; Adams, Gen. 



Moll. t. 30. f. 8. 



2. P. sulcatus, t. 52. f. 1 . 



Fig. 55 — Teeth of Pyrazus striatus. 



ff Canal produced. 



7. Lampania. 



Shell turrited; whorls waved; aperture ovate, nicked in front; 

 inner lip thick ; outer dilated, sinuous. Operculum circular, of many 

 whorls. — Adams, Gen. Moll. t. 30. f. 5 a. 



1. L. zonalis. 



Mangrove swamps. 



8. POTAMIDES. 



Shell turrited ; whorls angulated ; mouth ovate, produced in front ; 

 outer lip thin, sinuated in the middle. 



1. P. ebeninus, t. 52. f. 4 ; Adams, Gen. Moll. t. 30. f. 6. 



fff Canal indistinct, like a groove. 



9. Cerithidea. 



Shell turrited ; whorls flattish, waved and striated, subangular in 

 front ; mouth round ; canal indistinct ; outer lip dilated. Opercu- 

 lum circular. — Adams, Gen. Moll. t. 31. f. 2 a. 



1. C. obtusa, t. 52. f. 2, t. 127 a. f. 10, t. 267. f. 3. 



2. C. Kieneri, t. 267. f. 4. 



3. C. Carbonnieri, Adams, Gen. Moll. t. 31. f. 2. 



Teeth of Cerithidea 1 obtusa 3*1*3; central and inner lateral 

 similar, with transverse, reflexed, subdentated apex ; the inner 

 lateral (central ?) with elongated linear roots, oblique towards the 



