itssUUEI.lid.e. 2l>'J 



In this genus the position of the foramen is the same as in 

 Rimula, but is furnished with the internal calcareous arch pecu- 

 liar to Cemoria. 



1. pilkolus (f. 1, 2), A. Adams. — Piriformis, costellis ra- 

 diantibus crenulatis, interstitiis cancellatis, vertice postice valde 

 incurvato ; fissura antice acuta, margine postice reflexo. Obs. This 

 species is more cap-shaped and the apex more involute than iu C. 

 pelex; it is also more laterally compressed and of smaller size. 



2. pei.ex (f. 3, 4), A. Ad. Ann. and Mag. Nat. Hist. I860. 

 — Piriformis, liris radiantibus crenulatis, interstitiis cancellatis 

 ornata; tissura iutiis concainerata, maiginibus callosis extus la- 

 biiselevatis longitudinalibus marginatis; foramine lineis incremeuti 

 trausversis apicem versus currentibus, margine crenulato. 



Genus ZEIDORA, A. Adams. 

 Plate X. 



Char. Gen. Testa oblonga, depressa, extus cancellata, apice pos- 

 tico, margine antico fissurato, interne lamina septiformi trans- 

 versa instructa. 



This genus resembles Emarginula in the fissured anterior mar- 

 gin, but the interior has a horizontal septum similar to that of 

 Crj/pta (or Orepidula) . 



1. reticulata (f. 1, 2), A. Adams. — Oblonga, dorso convexa, 

 lineis elevatis longitudinalibus radiantibus et lirulis concentricis 

 pulcherrime decussata; apertura margine creuulata ; tissura pro- 

 funde angusta. Obs. This species differs from Z. calceolina m 

 being much more convex, less obtuse anteriorly, and in the fissure 

 being narrow and deeply incised ; the sculpture moreover is very 

 different, being finely reticulated instead of widely cancellate. 



2. calceolina (f. 8), A. Adams. — Oblonga, lineis elevatis 

 concentricis et radiantibus eleganter cancellata ; sulco mediano 

 lateribus elevatis; apice postice deilexo ; septo margine acuto in- 

 tegro. Obs. Wider and more depressed than Z. reticulata, and 

 the concentric and radiating lines form a much wider network. 



Genus RIMULA, Be France. 

 Plate X. 

 Char. Gen. Testa tunica, apice postico recurvo; extus cancel- 



