Report on Foraminifera. By F. W. Millett 7 



portion being identical in all points, even in magnitude, with Boli- 

 vina lobata Brady ; whilst the chambers composing the linear series 

 resemble Lagena Jimbriata Brady. 



It is found at several Stations in both Areas, but is nowhere 

 abundant. - 



Bigenerina {Siphogenerina) Schlumbergerii sp. n., 

 plate I. figs. 5, 6. 



Test hyaline, thin, elongate, tapering, slightly compressed ; bise- 

 rial and uniserial chambers both inflated, and both having short spine3 

 scattered over the surface. Aperture large and curved. Throughout 

 the uniserial chambers a tube connects the aperture of each chamber 

 with that of the one preceding it. Length ■ 46 mm. 



The genera Bigenerina and Sagrina are superficially so much 

 alike that it is difficult to distinguish one from the other by their 

 external characters, The Sagrinie have the test composed of the 

 dense vitreous substance usually found in the family Lagenidse ; 

 whilst in Bigenerina the test, when hyaline, is thinner and more 

 porous. The internal siphon is common in the Lagenidse, and also 

 occurs, in a modified form, in many of the Malay species of the Tex- 

 iularidse, as will be shown in due course ; consequently it cannot be 

 accepted as a feature distinguishing one family from the other. In 

 M. Schlumberger's genus Siphogenerina are to be found arenaceous 

 as well as hyaline forms. His S. ocraeea from New Caledonia 

 differs from Bigenerina digitata in little more than the possession of 

 the internal siphon and the consequent alteration in the position of 

 the aperture. 



It may be observed that the aperture of B. Schlumbergerii 

 closely resembles that of the B. calcarata of Berthelin,* as shown by 

 his figures and also by that of Chapman from the Gault of Folke- 

 stone.! 



From the characters of B. Schlumbergerii it seems to be more 

 nearly allied to Bigenerina than to Sagrina, although there is here 

 plenty of room for a difference of opinion. 



Fig. 3 is from a drawing by the late M. Berthelin showing the 

 test viewed by transmitted light. 



The species is very common in the Malay Archipelago, and occurs 

 at numerous Stations in both areas. 



Pavonina d'Orbigny. 



Pavonina flabelliformis d'Orbigny. 



P. flabelliformis d'Orb., 1826, Ann. Sci. Nat., vol. vii. p. 260, 

 pi. x. figs. 10-12; Modele No. 56. 



* Mem. Soc. Ge'ol. France, se'r. 3, vol. i. 1880, pi. xxiv. figs. 14-16, and pi. xxv. 

 fig. 2. 



t Journ. E. Micr. Soc, 1898, p. 15, pi. ii. fig. 14 (Sagrina kalcarata Ber- 

 thelin sp.). 



