PALUDINELLA. 315 



brackish water; one species is very abundant on the muddy 

 shores of the Thames in Kent. 



Species of Assiminia. 

 Francesia, Bens. Grayana, Leach. 



Genus PALUDINELLA, Pfeiffer. 



Tentacles broad, sub -triangular, obtuse; eyes on the 

 upper surface of the tentacles near the tips. 



Operculum sub-spiral. 



Shell turbinate, ovate or depressed, perforate, whorls 

 rounded, covered with an epidermis ; aperture sub-circular ; 

 peristome simple, somewhat continuous. 



Ex. P. littorea, Belle Chiaje, pi. 88, fig. 6. Oper- 

 culum, P. littorea, fig. 6, a. Shell, P. littorea, fig. 6, b. 



These animals are amphibious, living in marshes near 

 the sea; when placed in sea-water, they crawl away and 

 adhere by the foot, which is short and rounded at both 

 ends, to the sides of the vessel ; some are inhabitants of 

 fresh -water rivulets. 



Species of Paludinella. 



abbreviata, Mich. Lacheineri, Charp. 



acutissiina, Whit. littorea, Chiaje. 



atomaria, Miihlf. minuta, Totten. 



atomus, Phil. Parreyssii, Ziegl. 



dubiosa, G. B. Adams. Peteiningensis, Gould. 



fusca, Phil. Salinesii, Pfeiff. 



gibba, Drop. Scbmidtiana, Charp. 



globulus, Moll. sincera, Sars. 



granum, Mke. striatella, Fahr. 



