MOOKE ABJ^OEMAL SECONDARiT DEPOSITS. 551 



large whorl possesses distant, longitudinal, curved costae ; and by 

 aid of the lens concentric striae may be recognized ; aperture not 

 exposed. 



One of the peculiarities of the Liassic deposit at Brocastle, whence 

 this shell comes, is, that many of the genera have hitherto not been 

 found so low down ; and in this instance we have a genus that has 

 not been recognized below the Greensand, and is still to be sought 

 for in the intervening strata. 



50. ElMULA LIASINA. PI. XV. figS. 14, 15. 



Emarginula Hasina. Terq. 



SheU rather small, oblique ; apex posterior, curved ; surface with 

 numerous raised, longitudinal, radiating ribs, decussated by finer 

 transverse lines ; interspaces with numerous punctations ; foramen 

 near the anterior margin. 



There appears to be little doubt that the species is that figured as 

 Emarginula by M. Terquem, who states he possessed only a cast, and 

 that imperfect. Numerous examples in my possession show, from 

 the position of the foramen, that the species must be referred to 

 Rimula. 



It is rather plentiful, and usually attached to the coralliferous 

 blocks in the Liassic conglomerate at Brocastle. The Pileojosis nuda, 

 Terq., probably belongs to the same genus. 



51. EmuLA ELEGANS, spcc. uov. PI. XY. figs. 16, 17. 



SheU. rather small, conical, ovate; apex posterior; sides rather 

 flattened and acute, ornamented by numerous, close-set, regular, 

 longitudinal striae, which are crossed by numerous other transverse 

 striae. 



This shell is readily separated from B. liassina by its finer and 

 less-produced striae, and by its generally compressed or longitu- 

 dinally ovate form. 



It is also from the coralliferous conglomerate of Brocastle, and 

 more rare than the former species. 



52. DiscoHELix CORNUCOPIA, spec. nov. PI. XYI. figs. 1, 2, 3. 



Shell discoidal ; spire depressed, concave ; volutions 5-6 ; upper 

 margin of each whorl bounded by a depressed, transverse, rounded 

 rib, which, on the outer margin of the larger whorl, passes into a 

 very extended carina or encircling wing. The underside of this 

 winged area is angulated or convex, and is separated from a very 

 large and deep umbilicus by two carinae, within which is a rounded 

 furrow or canal ; sides of the umbilicus angulated. The ^nnged area, 

 the carinae, and the umbilicus are covered with longitudinal striae, 

 giving the under surface a very ornate appearance. Aperture 

 roundly ovate; inner lip reflected. These shells arc left-handed. 

 In one or two specimens the larger whorl has a tendency to leave 

 its usual plane and to become somewhat oblique. The chambered 



