SUBEMARGINULA. 283 



Section Plagiorhytis Fischer, 1885. 



Plagiorhytis Fischer, Manuel de Conchyl., p. 860. Type S. 

 stellata Ad. 



S. stellata A. Adams. PI. 29, fig. 33. 



Rather solid, whitish, elliptical, depressed-conical, apex sub- 

 central ; with elevated subspinulose radiating ribs, interstices sharply 

 roughened by close decussating stria? and costellse ; margin of the 

 aperture dentate, sinus sublateral, inside produced in a canal toward 

 the apex. This differs from any of the varieties of E. rugosa in the 

 production of the ribs at their marginal termination, and the greater 

 coarseness of the sculpture generally. (Ad.) 



Australia. 



Clypidina stellata Ad. P. Z. S. 1851, p. 87, no. 7. — E. stellata 

 Sowb. Thes., p. 219, f. 103. 



S. sulcifera A. Adams. PI. 29, figs. 5, 6. 



Oval, depressed-conic, greenish ; vertex obtuse, situated back of 

 the middle ; ornamented with radiating riblets, interstices hardly 

 equal, and incremental striae ; base arcuate ; margin of the aperture 

 crenulated, incision short, sublateral, produced into a canal inside. 



(Ad.) 



Habitat unknown. 



Clypidina sulcifera Ad., P. Z. S. 1851, p. 87, no. 5. — Sowb., Thes. 

 p. 219, f. 84, 85. 



Un figured species. 



Clypidina rudis A. Adams. Shell thick, rude, whitish, depressed- 

 conic ; 8 angulated radiating ribs, interstices decussated with longi- 

 tudinal riblets and concentric lines ; apex subcentral ; base arcuate ; 

 margin of aperture crenulated, sinuate in front, sinus produced into 

 a canal inside. Hub. unknown. (Ad., P. Z. S. 1851, p. 87, no. 6). 



Subemarginula galeata A. Adams. Shell grayish, rufescent, ele- 

 vated-conical, thin, vertex subcentral, inclined backward ; subclath- 

 rated with whitish, tuberculose radiating ribs and transverse elevated 

 lines ; front rib prominent ; margin of the aperture dentate, deeply 

 sinuated in front, sinus produced in a canal inside. Philippine 

 Archipelago. (Ad. P. Z. S. 1851, p. 90, no. 9). 



