NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 105 



Genus MIGROPORA Gray, 1848 

 Zoarium encrusting. Zooecia with an elevated mural rim which ends 

 in a knob-like enlargement on either side of the aperture. Cryptocyst 

 covering the entire frontal area except the aperture and small opesiules. 

 Ovicells endozooecial but very prominent. A small avicularium just distal 

 to the aperture. Genotype, Flustra coriacea Esper. 



Micropora coriacea (Esper), 1791 



Plate 11, fig. 3 

 Micropora coriacea, Hincks, 1884:12. 

 Micropora coriacea, Robertson, 1908 :275. 

 Micropora coriacea, O'Donoghue, 1923 :30 ; 1926 :49. 

 Micropora coriacea, Canu and Bassler, 1923 :58. 

 Alicropora coriacea, Hastings, 1930:719. 



Zoarium encrusting. Zooecia usually very regularly disposed, short 

 and broad, somewhat hexagonal in outline; mural rim high and thin, 

 but ending in a small knob-like structure at the sides of the aperture; 

 cryptocyst flat, depressed distally to the level of the minute opesiules and 

 then suddenly elevated to the proximal border of the aperture. The 

 operculum is semicircular. A small avicularium is situated just distal to 

 the zooecium, often wanting over much of the zoarium. The ovicells are 

 large, elongate, conspicuous and endozooecial. 



Distributed around the world in warmer and temperate waters; 

 common at many places in the Gulf of Mexico and the Caribbean Sea. 

 On the Pacific coast it is known from British Columbia (Hincks and 

 O'Donoghue), Santa Catalina Island, California (Robertson), and the 

 Galapagos Islands (Hastings). 



In the Hancock collections it is represented at 56 stations all along 

 the coast from the Channel Islands, California, to the Galapagos Islands 

 and the coast of Peru. 



Genus ROSSELIANA Jullien, 1888 

 "Flustra rosselii Audouin, qui a son cryptocyste a moitie developpe et 

 son orifice semicirculaire (type du genre Rosseliana), n. gen." Jullien, 

 1888:78. 



Canu and Bassler, 1920:288, accept this genus and place it in the 

 family Microporidae, with the additional description: "The frontal of 

 the zooecium is a cryptocyst of little depth. The opesium is semicircular. 

 The ovicell is endozooecial but prominent. Septulae uniporous. No 

 avicularia." Genotype, Flustra rosselii Audouin, 1826. 



