632 MESSRS. E. HERON-ALLEN AND A. EAELAND ON 
154. DiSCORBINA VALVULATA [cV Orhigny). 
Rosalina valvidata d'Orbigny, 1826, TMC. p. 271, no. 4; 1836, FIC. p. 136, 
pi. 2. figs. 19-21. 
Discorbina „ Brady, 1884, FC. p. 614, pi. 87. figs. 5-7. 
Heron-Allen & Earland, 1914-15, FKA. p. 695. 
Common. Very fine and typical specimens. 
155. Discorbina eeniformis Heron-Allen Sf Earland. 
Discorbina reniformis Heron- Allen & Earland, 1914-15, FKA. p. 698, pi. 52. 
figs. 7-14. 
A single quite characteristic specimen of this very obscure species. It 
appears to be very wiiloly distributed over the Indo-Pacific area, thonoh it 
is always rare. 
156. Discorbina rdgosa (ir Orhigny). 
Rosalina nigosa d'Orbigny, 1839, FAM. p. 42, pi. 2. figs. 12-14. 
Biscorhina „ Brady, 1884, FC. p. 652, pi. 87. fig. 3 ; pi. 91. fig. 4. 
„ Heron-Allen & Earland, 1914-15, FKA. p. 197. 
Kare, but very fine and typical specimens. 
157. Discorbina polystomelloides Parker ^- Jones. 
Discorbina polystomelloides Parker & Jones, 1865, NAAF. p. 421, pi. 19. fig. 8. 
Brady, 1884, FC. p. 652, pi. 91. fig. 1. 
Heron-Allen & Earland, 1914-15, FKA. p. 698, 
pi. 52. figs. 19-23. 
Common and attaining comparatively enormous dimensions, the largest 
having a maximum diameter of 3 mm. The specimens vary considerably in 
their surface ornament, some having developed secondary shell-structure in 
the form of beads and ribs to an extent that we have never previously 
observed in this species. 
158. DlSC0iy3iNA rimosa Parker Sf Jones. 
Discorbina rimosa Carpenter, Parker, & .Jones, 1862, ISF. p. 205. 
„ Millett, 1898, etc., FM. 1903, p. 702, pi. 7. fig. 7. 
„ Heron-Allen & Earland, 1914-15, FKA. p. 700. 
The specimens referable to this species merely tend to confirm our views 
expressed {ut supra) as to the inexpediency of separating this species from 
J>. polystomelloides. They could very well be included as pauperate speci- 
mens of the latter^ in view of the wide range of variation exhibited by that 
species. 
159. Discorbina raeescens Brady. 
Discorbina rarescens Brady, 1884, FC. p. 651, pi. 90. figs. 2, 3, & •?4. 
Heron-Allen & Earland, 1914-15, FKA. p. 700. 
One small but perfectly typical specimen. 
