Manchester Memoirs, Vol. Lxii. (191 7) 23 



type, built up of angular sand grains and particles of calcareous 

 matter. There is no selective tendency as recorded by us from 

 several widely separated gatherings.) 



39. Haplophragmium pseudospirale (Williamson.) 



Proteonina pseudospiralis, Williamson, 1858, Recent British 



Foram., p. 2, pi. I, figs. 2-3. 

 Haplophragmium pseudospirale, Brady, Chall. Rep., p. 302, 



pi. XXXIII, figs. 1-4. 



Not rare, distributed through the whole thickness of the 

 marl. The majority of the specimens however were found 

 in Gathering No. 5, 1893.) 



(Some of the specimens can only be accepted with reser- 

 vation owing to their condition, but large and typical examples 

 are represented from Gathering 5.) 



39A. [Haplophragmium tenuimargo, Brady.] 



[Haplophragmium tenuimargo, Brady 1882, KE. p. 715. 

 H. tenuimargo, Brady, 1884, FC. p. 303, pi. XXXIII, figs. 

 13-16.] 



40. Haplophragmium ^equale, (Roemer). 



Spirolina cequalis, Roemer, 1840-1, Verst. norddeutsch Kreide, 



p. 98, pi. XV, fig. 27. 

 Haplophragmium cequale, Reuss, i860, Sitz. k. Ak. Wiss. 



Wien, vol. XL, p. 218, pi. XI, figs. 2 a, b, and 3 a, b. 



Frequent, but sometimes difficult to distinguish from Clavu- 

 lina cylindrica, Hantken, on account of the material of which 

 the test is composed being the same in both species as found 

 at Biarritz, and also by the regularity of growth and closely- 

 fitting chambers of the species now under consideration, which, 

 in some cases, can only be recognised by a slight obliquity of 

 the aboral portion of the test. Longitudinal sections, however, 

 show the true nature of the organism. Other specimens 

 approach more closely to those figured by Reuss and those 

 found in the Gault of Folkestone by Chapman. 



(Halkyard's sections leave no doubt as to the correctness 

 of his generic determination, but the specimens are very vari- 

 able and are more smoothly constructed than is usual in this 

 species. The records appear to be exclusively confined to the 

 Cretaceous series, and its extension into the Eocene at Biarritz 

 is noteworthy.) 



