328 



RISSOID^. 



which is furnished, as in Nerita and Rissoella, with an' 

 internal appendage, serve, however, to distinguish them. 



Species of Rissoina. 



bellula, A. Adams. 

 Bruguieri, Payr. 

 Bryerii, Mont. 

 ceelata, A. Adams. 

 caucellata, Phil. 

 cerithina, Phil. 

 Chesnelii, Mich. 

 claudestina, C. B. Adams. 

 clathrata, A. Adams. 

 costata, A. Adams. 

 Cumingii, Reeve. 

 decussata, Duge. 

 deformis, Sow. 

 delicata, Phil. 

 D'Orbignyi, A. Adams. 

 dubiosa, C. B. Adams. 

 excavata, Phil. 

 fasciata, A. Adams. 

 firmata, C. B. Adams, 

 fortis, G. B. Adams. 

 grandis, Phil. 

 Inca, VOrh. 

 insculpta, Recluz. 



insignis, Adams and Reeve. 

 micans, A. Adams. 

 minutissima, Mich. 

 monilis, A. Adams. 

 nitida, A. Adams. 

 nivea, A. Adams. 

 nodicincta, A. Adams. 

 notabilis, C. B. Adams. 

 Philippiana, Pfeiff. 

 plicata, A. Adams. 

 pulclira, C. B. Adams. 

 pusilla, Brocc. 

 pyramidalis, A. Adams. 

 scalarella, C. B. Adains. 

 scalariana, A. Adams. 

 scalariformis, C. B. Adams. 

 scalarioides, C. B. Adayns. 

 semis triata, Phil. 

 spirata, Sow. 

 striata, Quoy and Gaim. 

 striolata, A. Adams. 

 subangulata, G. B. Adams. 

 tridentata, Mich. 



Sub-gen. zebina, H. and A. Adams. 



Shell white, solid, opaque, polished, smooth or partially 

 striated ; outer lip thickened, often with one or more tubercles 

 internally at the fore part. 



albida, G. B. Adams. 



concinna, A. Adams. 



