162 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Genus CRATEROPORA Levinsen, 1909 



The ovicell is endotoichal and placed at the distal extremity of the 

 zooecia; it is open above the opesium. The aperture is closed by 

 an operculum attached to the ectocyst; its proximal border bears 

 a very short polypidian lamella, on each side of which there is an 

 opesiule. Reticulocellaria present. 



Genotype. — Crateropora falcata Levinsen, 1909. 



Range. — Cretaceous (Rocanean) — Recent. 



\w^^flS i m -^y$ i"\ <#% ..Jill 



^a ^ B PPf* 



Fig. 42. — Genus Setosella Hincks, 1877 



A-C. Setosella vulnerata Busk, 1860. A. Group of zooecia, X25, with their 

 vibracula. B. Ovicelled zooecia, X25. The ovicell is endotoichal and placed 

 on the distal part of the zooecium (after Jullien, 1882). C. Group of zooecia 

 without ectocyst, X25, showing the form of the opesiules and the vibracula. 

 (A-C. After Hincks, 1880, 1881.) 



The known species of this genus are as follows: 



Crateropora falcata Levinsen, 1909 Recent. 



Crateropora (Steganoporella) patula Waters, 18S1 Miocene. 



Crateropora (Aspidostoma) flammula Canu, 1911 Miocene (Patagonian) . 



Crateropora (Aspidostoma) onychocellifera Canu, 1907 Cretaceous (Rocanean). 



Crateropora (Onychocella) cucullala Thornely, 1905 Recent (Ceylon). 



Crateropora expansa Hanner, 1926 Recent (Malay region). 



Crateropora foraminata Harmer, 1926 Recent (Malay region). 



The diagnosis of Levinsen, 1909, is incomplete as he did not indi- 

 cate the nature of the ovicell and moreover he noted the presence 

 of a polypide tube where there is only a simple convex lamella which 

 can be considered merely as a very incomplete rudiment of a poly- 

 pide tube. The reticulocellaria are avicularia (or onychocellaria) 

 with the cryptocyst perforated by one or many pores. Canu and 

 Bassler, 1920, mentioned the possibility of ovicells in this genus; 

 they are now known in three species. 



CRATEROPORA EXPANSA Harmer, 1926 



Plate 18, figs. 2, 3 



1926. Crateropora expansa Harmer, Polyzoa Siboga Expedition, p. 331, pi. 22, 

 figs. 8-13. 



Description. — The zoarium is free, bilamellar or encrusting other 

 bryozoa. The zooecia are distinct, separated by a deep furrow, very 



