159 



calcified ectoooeciuni is generally provided with a larger or smaller number of 

 perforations. Dependent avicularia may appear, and the shield is perforated by 

 pores. 



Cr. pimcliUa, Cr. cryptoecium Norman ', Cr. aiinulatu and Geplnjroles nitido- 



pnnctata (Smitl) belong to this genus. 



In Cr. piinclata (fig. 11) we find in the same colony both hyperstomial ooecia 

 and ocecia enclosed by kenozocrcia. On examining a longitudinal .section af Cr. 

 annulata (fig. 10) we might be inclined to regard the ooecia as formed by a 

 large distal spine. A closer examination will show distinctly, however, that the 

 endoooecium is formed by the distal wall, which has 4 — 5 uniporous rosette- 

 plates. Moreover the surrounding kenozou^cium (10 a) is provided with pore- 

 chambers. As in the species of Retiflustra the basal i)art of the oa'cium lies 

 higher (more distally) than its free, frontal margin (10 b). 



Puellina Jullien", Char, emend. 



Cribrilina JuU. p. p. 



(PI. IX, fig. 12a). 



The semi-circular aperture in the frontal shield is filled by a wholly chitini- 

 zed, simple operculum. The shield is perforated by pores, of which those in its 

 periphery serve as passage for short, tentaculiform evaginations from the frontal 

 membrane, of which the first pair is considerably longer than the others. The 

 ocecia, which are hyperstomial or enclosed by kenozonecia, have a wholly calcified 

 ectoocecium. Few-pored pore-chambers. Independent but not dependent auiciilarid 

 may appear. 



Cribrilina radiatu, Cr. iimominata and Puellina Gattija' belong to this genus. 

 The first-named species, which seems to have a wide distribution, will probably 

 prove collective. 



With regard to Harmer's contrary opinion^ of the structure of the frontal 

 shield in P. radiala I can only say, that in this matter I share the opinion of 

 Norman.* 



Figulina Jullien ^, Char, emend. 

 The aperture in the frontal shield, which has a more or less distinct sinus, 

 is covered by a wholly chilinized compound operculum. Each distal wall with 

 a row of uniporous, and each lateral wall with a number of mulliporous rosette- 

 plates. Hyperstomial owcia whose ectoocecium is provided with a median suture 



' 84, p. 102. -' 44, p. (i(>7. ■' 1!), p. li'ili. * 84, p. l)(i. '' 44, p. G08. 



