90 PLEURODONTE. 



P. tridentina Fer., v, 109. P. valida C. B. Ad., v, 113. 



sivainsoniana C. B. Ad., v, 109. P. picturata C. B. Ad., v, 113. 



v. browneana Pfr., v, 109. sinuata Deless., Chenu, etc. 



v. subsloaneana Pils., v, 110. P. pallescens Shuttl., v, 114. 



P. okeniana Pfr., v, 110. P. sinuata Mull., v, 114. 



fortis C. B. Ad., Rv. v. propenuda Ad., v, 115. 



P. atavus Shuttl., v, 110. P. sinuosa Fer., v, 115. 



P. sloaneana Shuttl., v, 111. consanguinea C. B. Ad. 



bronni v. ft Pfr. v. simson Pfr., v, 116. 



schrceteriana Rv. P. invalida C. B. Ad., v, 117. 



v. vendryesi Ckll., viii, 263. v. candescens C. B. Ad., v, 117. 



P. bronni Pfr., v, 112. P. anomala Pfr., v, 117. 

 P. strangulata C. B. Ad., v, 112. 



Section Caprinus Montfort, 1810. 



Caprinus MONTF., Conch. Syst., ii, p. 142, type Caprinus recognitus 

 Montf. (=H. lychnuchus Miill.). Lucidula SWAINS., Treatise on 

 Malacol., p. 329, type barbadensis (=isabella Fer.). Lucernella- 

 SWAINS., t. c., p. 330, type hippocastaneum (=nuxdenticulata). Den- 

 tellaria BECK, Index Molluscorum p. 34, (1837), and of subsequent 

 authors. Not Dentellaria Schumacher, Essai, p. 230 ! 



Shell imperforate, solid, opaque, globose or depressed, the spire 

 convex or conoidal, periphery rounded or keeled. Surface generally 

 granulated. Aperture transverse, wider than high, oblique, iheper- 

 istome thick, expanded, the basal lip widened and generally toothed ; 

 parietal wall covered with a callus, sometimes toothed. Type 

 see also (P. lychnuchus P. Isabella Fer., pi. 25, fig. 11 ; pi. 25, fig. 

 10, P. nuxdentieulata^. 



Animal (of P. orbiculata) having the sole undivided ; edges of 

 foot with no trace of a foot-margin. Entire upper surface rather 

 evenly granulated, the granules arranged in rather indistinct lon- 

 gitudinal rows on the back, elsewhere irregularly placed. Mantle 

 margin without shell-lappets, the right body-lappet well developed, 

 the left minute, subobsolete. 



Jaw arcuate, solid, and either having few strong ribs (pachygastra, 

 orbiculata, Isabella, dentiens, nucleola, badia, nuxdentieulata), or 

 without ribs, but having a median projection (formosa, josephince). 

 P. orbiculata, perplexa and lychnuchus have weak ribs or traces of 

 ribs, thus connecting the two extremes of jaw structure (pi. 24, fig. 

 2, P. Josephines ; fig. 3, nuxdentieulata ; fig. 9, orbiculata; fig. 11, 

 dentiens'). 





