THE FAMILY TEXTULAEIID^ 169 



Sub-genus Siphogenerma, Schlumbergek. 



Test either arenaceous or hyaline, and in no 

 essential particular differing from Bigenerina exter- 

 nally, excepting in the position of the aperture ; 

 internally the uniserial chambers are connected by a 

 siphon or tube. 



Example. — B. {Siphogenerina) Hcldunihergeri, 

 Millett, ' Journ. Eoy. Micr. Soc' 1900, p. 7, pi. i. 

 figs. 5, 6. 



The thin hyaline test of this species shows, when 

 mounted in a transparent medium, the internal 

 siphonate tube which connects the chambers of the 

 later series. Millett records this species as being- 

 very common in the Malay Archipelago. (Plate 9, 

 fig. H.) 



Genus Pavonina, D'Oebigny. 



Early chambers small and textularian, later cham- 

 bers broadly arched and uniserial, forming a fan- 

 shaped test ; aperture porous. Fieceiit. 



Example. — P. flahelliformis, D'Orbigny, 'Ann. 

 Sci. Nat.' vol. vii. 1826, p. 260, No. 1, pi. x. figs. 

 10, 11 ; modele. No. 56. 



This is the only species of the genus. It is a very 

 handsome but rare form. The principal localities 

 where it has been found are the West Indies, Mada- 

 gascar, the Seychelle Islands, the Mauritius, Ceylon, 

 Torres Strait, Malay Archipelago, Cocos Island, Ad- 

 miralty Islands, Honolulu, and the coast of Korea. 

 It inhabits fairly shallow water. (Plate 9, fig. I.) 



