588 MESSES. E. HEEON-ALLEN AND A. EAELAND ON THE 



8 Stations. 



Generally distributed, but never more than an occasional specimen, except at Stns. 6 

 and 10, and very rare at them. The individuals vary greatly in size, being generally 

 very small, the largest and best at Stn. 12. The original allocation of this form to the 

 genus SpiroloGulina seems open to great objection ; the earlier chambers are invariably 

 arranged on a quinqueloculine plan giving a thickened central portion to the shell. 

 The aperture is also invariably cribrate. It would appear to be little more than a 

 starved and spiroloculine form of Hauerina compressa d'Orb. 



99. Hauerina compressa d'Orbigny. 



Hauerina compressa d'Orbigny, 1846, PFV. p. 119, pi. v. figs. 25-27. 



Brady, 1884, FC. p. 190, pi. xi. figs. 12, 13. 



Egger, 1898, FG. p. 244, pi. iii. figs. 9, 10, 23, 24. 

 „ „ Millett, 1898, etc., FM. 1898, p. 610, pi. xiii. fig. 11. 



„ „ Sidebottom, 1904, etc., RFD. 1904, p. 19, pi. v. figs. 7, 8 ; text-fig. 8. 



„ „ Ehumbler, 1906, FLC. p. 52, pi. iii. fig. 39. 



15 Stations. 



Occurs at nearly all the Stns., often very abundantly. 



H. compressa appears to be a very variable form. D'Orbigny's original figure and 

 description represent a shell having four chambers in the final convolution and some- 

 what inflated, so that the earlier chambers are depressed and visible in the umbilical 

 region on either side of the shell. The marginal edge is subcarinate, and the aperture 

 is described as an oval opening surrounded with numerous tubercles. These tubercles 

 were, however, probably perforations misinterpreted by the author. 



Karrer (K. 1868, MFKB. p. 154, pi. iii. fig. 9) figures, under the name Peneroplis 

 aspergilla, a species which appears to us to be the same form, although he contrasts 

 it with d'Orbigny's species largely on the ground that the aperture is cribrate and not 

 a simple opening. In Karrer's figure the four chambers of the terminal whorl are 

 more inflated than in d'Orbigny's species ; the edge is rounded, the early chambers 

 are hardly visible, and the aperture is a large and rounded cribrate extension to the 

 terminal chambei-. 



Brady (B. 1884, FC. p. 190, pi. xi. figs. 12, 13) figures yet another very diff'erent 

 type, which is compressed, has three chambers visible in the final whorl and two or 

 three complete whorls visible in the inner portion, which, however, is sunk below the 

 level of the final chambers. The aperture is large and cribrate, covering the whole of 

 the end of the terminal chamber. 



The Kerimba specimens, although varying considerably among themselves, are, on 

 the whole, difl"erent from any of these three types, inasmuch as the central portion is 

 nearly always the thickest part of the shell and exhibits hardly any visible seg- 

 mentation. The final convolution in nearly all cases consists of three chambers only, 

 but in a few instances, especially in small individuals, there are only two chambers in 



