162 DAMAYANTIA, MARIAELLA, UROCYCLUS. 



Genus DAMAYANTIA, Issel, 1874. 



D. DILECTA, Issel. PI. 35, figs. 32, 33. 



Brown or brownish 3 r ellow, with rhomboidal blackish, slightly 

 raised tubercles, mantle maculated and spotted with blackish, 

 sole yellowish. 



Borneo. 

 Genus MARIAELLA, Gray, 1855. 



M. DUSSUMIERI (Val.), Gray. PL 35, fig. 31. 



Shell completely hidden, half ovate, elongate, solid, white, 

 with a thin narrow corneous margin, apex subterminal on the 

 right hinder edge, internally calcareous, only slightly concave. 



Mahi, Seychelles Isles. 



Type of the genus, and only species known to Gray. 



M. INFUMATA, Fer. PL 36, figs. 45, 46. 



Figured, but not described, and no locality given ; nor has it 

 been identified. If the shell was entirely hidden under the 

 mantle lobes as shown by the figures, it could not be a Parma- 

 rion ; although it has generally been referred to that genus. 



Subgenus TENNENTIA, Humbert, 1862. 



M. THWAITESII, Humbert. PL 36, figs. 40-42. 

 Epidermis shining, marked with growth-lines. 

 Length 6-7, width 3-4 mill. 



Mountainous regions of Ceylon. 



M. PHILIPPINENSIS, Semper. PL 36, figs. 43, 44, 



Animal yellowish- or reddish-gray, with a dark line on either 

 side of the neck, and two similar lines parallel on the mantle. 

 Shell rather flat, with epidermis, nucleus turned to the side, 

 showing an oblique fold below. 



Mindanao, Philippines. 



Genus UROCYCLUS, Gray, 1864. 

 U. KIRKII, Gray. PL 29, figs. 70, 71. 



Pale brown, with minute square black spots on the sides, with 

 a black streak on each side of the back ; middle of the back with 

 two darker brown streaks. The sides of the body with diverging 



