Measurements. 



AST. 22. CYCLOSTOMATOUS BRYOZOA— CANU AND BASSLER. 123 



The tubes are cylindrical, recurved at their extremity and separated 

 by the small mesopores irregularly arranged. The ovicell is very 

 large, orbicular, very convex, perforated by a large number of tubes. 



Diameter of peristomes 0. 10 mm. 



Distance of peristomes .42 mm. 



Separation of peristomes .42 mm. 



Diameter of zoarium 2.00 mm. 



Afilnities. — This species differs from Gramfimaseosoecia ^dichotoma 

 Goldfuss, 1827, in its smaller micrometric dimensions, in its more 

 salient peristomes, and in a smaller number of mesopores between the 

 peristomes. 



In transverse section the basal lamella is very short. The zoarium 

 is surrounded by a tkick lamellar tissue, perforated by the mesopores. 

 The intensity of calcification is so great that the mesopores have the 

 aspect of vacuoles in longitudinal sections. 



Occurrence. — Cretaceous (Maastrichtian) : Maastricht, Holland. 

 Holoty-pe.—Q^i. No. 68967, U.S.N.M. 



GRAMMANOTOSOECIA, new genus. 



Greek, gramme., line, and notos., back or dorsal. 



Ascosoeciidae with orbicular ovicell. The tubes are long, cylindri- 

 cal, without peristome, with dorsal gemmation on a basal lamella. 

 There are numerous mesopores between the tubes. 



Geiiotype. — Grairwmnotosoecia contorta., new species. Santonian, 

 Campanian. 



In the presence of a median lamella in transverse sections of the 

 free specimens and in the exterior aspect, this genus has much re- 

 semblance to Ditaocia Hagenow, 1851. It differs from it in the nature 

 of its ovicell, which is like that in the Ascosoeciidae (and not the 

 Liosoeciidae), and in the dorsal gemmation instead of triparietal. 

 It differs from Grammascosoecia in its dorsal instead of triparietal 

 gemmation. 



GRAMMANOTOSOECIA CONTORTA. new species. 



Plate 21, fig. 1-6. 



Description. — The zoarium is free and formed of large, narrow, 

 elongated, bilamellar fronds twisted around a central axis. The 

 tubes are cylindrical, with dorsal gemmation on a median lamella, 

 without peristome; their orifice is orbicular. The mesopores are 

 numerous, small, polygonal. The ovicell is large and orbicular, per- 

 forated by the tubes but not by the mesopores. 



I Diameter of orifice 0.10-0.12 mm. 

 Diameter of ovicell 1.50 mm. 



Width of fronds 2.00-4.00 mm. 



