EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVHsTCES. 239 



DIANULITES COLLIFERA, new species. 

 Text fig. 134. 



The internal structure of this species is quite similar to that of 

 Dianulites petropolitana. Externally there is no difficulty in sepa- 

 rating the low hemispheric zoarium of the present form with its 

 nodulated surface (fig. 134 a and h) from the smooth, dome-shaped 



Fig. 134.— Dianulites colufera. a Airo b, side aitd front views op the type-specimen, natural 

 size; c, surface, X9, "with distinct granules along the "walls; d, the usual aspect presented 

 IN tangential sections, X20; e, vertical section of several tubes, X20; /, a zocecium, x35, in a 



TANGENTIAL SECTION WITH THE CHARACTERISTIC WALL STRUCTURE. LTCKHOLM LIMESTONE (Fl), 

 KERTEL, ISLAND OF DAGO. 



masses of the former. The zooecia of D. coUifera are thin walled, 

 and show the characteristic granules of Dianulites exceptionally 

 well, both at the surface and in thin sections. Five zooecia occur 

 m 3 mm.; mesopores usually few but sometimes numerous enough 

 to average one to a zoo3cium. True acanthopores wanting. Tabulae 

 at iatervals varying from one and a half to two tube diameters apart. 



