12 



Genus — Discorbixa, Parker & Jones. 

 Tlie Discorbina? of the Lower Bed are represented by a con- 

 siderable number of species, but as individuals are almost without 

 •exception small and starved examples and in limited numbers. 

 In tlie Upper Bed they are finer examples, and more numerous, 

 .and include several species not found in the Lower Bed. 



126. D. turbo, d'Orb. Lower Bed, rather scarce; Upper Bed, 

 very common. 



127. D. rosacea, d'Orb. Rather scarce in both Beds. 



1 28. D. ylobuJaris, d'Orb. Lower Bed, rather scarce ; Upper 

 Bed, rare. 



129. *D. Araucana, d'Orb. Lower Bed, rare. 



130. *i>. Bertheloti, d'Orb. Lower Bed, rare. 



131. D. hiconcava, P. k J. Much compressed bilaterally. 

 Lower Bed, rare ; Upper Bed, rather scarce. 



132. *i>. pateUiformis, Br. Lower Bed, rather scarce. 



133. *Z>. orhicidaris, Terq. Lower Bed, rare. 



134. *D. (?) tabernacuJaris, Br. If this be rightly assigned, 

 it is a feeble example destitute of limbation, although resembling 

 the species in other respects. Lower Bed, rare. 



135. D. jjolysfomeUoides, P. and J. Lower Bed, a single example 

 of this fine species. Upper Bed, rather scarce. 



136. tZ>. iiileohis, d'Orb. Upper Bed, rather scarce. 



137. tZ>. vesimdaris, Lamk. Upper Bed, rare. 



128. fD. Vilardeboana, cVOvh. Upper Bed, moderately common. 



139. jD. ojyercidaris, d'Orb. Upper bed, rare. 



140. jD. raresceiis, Brady. Upper Bed, rare. 



141. *i). crnciforniis, sp. nov. PI. i., figs. 13, 14. 



Test subglobular, slightly compressed laterally, consisting of 

 about three convolutions arranged inequilaterally on a Rotaliform 

 plan, so that usually four segments are visible on the inferior and 

 about eight on the superior face. Segments inflated, their con- 

 vex surfaces on the superior face studded with short thickly-set 

 spines ; sutural lines depressed, excavated, and free from spines. 

 Inferior surface smooth, its four segments arranged in form of a 

 Maltese cross. Umbilicus depressed. Aperture a small circular 

 orifice situated in the umbilical depression. Average size, -/g- in. 



This peculiar little shell is obese, but unequally convex. Its 

 superior surface is rendered rugose by the presence of short spines 

 so thickly set that they cannot be distinguished as spinous growths 

 •except by viewing them laterally where they terminate in an 

 abrupt line. Its nearest analogue is perhaps Discorhina pul- 

 cinata, a new species obtained by Mr. Brady from tAvo localities 

 in Challenger material, viz., Admiralty Islands and Torres 

 Straits. The species now described can be easily distinguished 

 from the one referred to by its greater number of chambers, the 



