606 MESSES. E. HEROJ^-ALLEN AND A. EAELAND ON THE 



A specimen exhibiting two distinct young individuals fused at a comparatively- 

 advanced stage of growth, followed by many concentric annuli of chambers, was 

 found. 



120. Orbitolites complanata Lamarck. 



Orbitolites complanata Lamarck, 1802, Syst. Anim. saus Vert. p. 376. 



Carpenter, 1856, etc., RF. 1856, p. 224, pis. iv.-ix. 

 „ „ Mi3bius, 1880, FM. p. 81, pi. iv. figs. 4, 5, pi. v. figs. 1-5. 



„ „ Carpenter, 1883, RGO. p. 29, pi. v. figs. 11-18, pis. vi.-viii. 



Brady, 1884, FC. p. 218, pi. xvi. figs. 1-6, pi. xvii. figs. 1-6. 

 „ . „ Lister, 1895, LHP. p. 431, pi. ix. figs. 41-51. 



„ Chapman, 1900, FLF. p. 181. 



9 Stations. 



Very abundant, especially at Stns. 9 and 12, and frequent at many of the other 

 Stns. At Stn. 9 a complete series of specimens from primordial chambers up to 

 nearly half an inch in diameter was obtained, also showing every stage of multiformity 

 and repair. Specimens were found showing the coalescence in the early stage of the 

 shell of from two to five and even seven megalospheric primordial chambers. At 

 Stn. 12 large microspheric specimens were found containing in the outer annulus 

 numerous megalospheric young, primordial chambers often with half to a whole 

 annulus of the succeeding chambers perfectly developed. We are describing and 

 figuring these specimens elsewhere (H.-A. 1915, RPF. pis. xiv., xv. figs. 16-20, 33). 



It is noticeable that the Kerimba specimens exhibiting this stage in the life-history 

 were flat and otherwise normal, not distorted or crumpled at the edges as in 

 0. complanata, var. laciniata Brady [which would appear to be the same as Margino- 

 pora vertehralis, \ar. plicata Dana (J. D. Dana, 1846, in C. Wilkes' U.S. Exploring 

 Expedition, vol. vii., Zoophytes, p. 706, pi. Ix. fig. 9)]. In this variety alone the 

 reproductive process appears to have been hitherto recorded. 



At Stn. 9, which was the Stn. at which Orbitolites reached its optimum development, 

 many individuals were found exhibiting the superficial deposits of shell-matter arranged 

 in radiating lines from the centre of the test above referred to. 



Alveolina d'Orbigny. 



121. Alveolina boSCii (Defrance). 



"Alveolites" Defrance, 1816, Diet. Sci. Nat. vol. i. p. 557 [Alveolite grain de festuques, 



Rose.) *. 

 Orysaria boscii Defrance, 1820, Diet. Sci. Nat. vol. xvi. p. 104 (sub Fabularia). 

 Alveolina boscii d'Orbigny, 1826, TMC. p. 306, no. 5, Modele no. 50. 



„ Mobius, 1880, FM. p. 79, pi. iii. figs. 13-15, pi. iv. fig. 1. 

 „ Brady, 1884, FC. p. 222, pi. xvii. figs. 7-12. 



* The page 137, which is generally given in synonymies, describes Alveolitis ^'■Animal inconnu, contenu dans 

 deux cellules calcaires," 'which has no relation to A. boscii. Alveolites occurs in the " Supplement " to vol. i. 



