NO. 3 OSB URN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 619 



Genus STOMATOPORA Bronn, 1825 



Alecto Lamouroux, 1821, preoccupied. 



This genus was described and has generally been considered as uni- 

 serial, adnate and branching. Some authors have introduced into it 

 various linear adnate branching species with a biserial or multiserial 

 zoarium, which preferably belong elsewhere. The only part of the 

 Stomatopora which is biserial is the expansion about the ovicell. Geno- 

 type, Alecto dichotoma Lamouroux, 1821. 



There has been no description of the ovicells until recently, but Borg, 

 1926:358, has discovered them in S. ehurnea (d'Orbigny) and 5. granu- 

 lata (Milne-Edwards). They are very simple in nature, differing but 

 little from those of Crista except that they are more or less embedded. 



It is true that the zoarium of species of the Tubuliporidae (sens lat.) 

 originates in a single zooecium and sometimes the uniserial condition is 

 continued for several generations of zooecia before the biserial or multi- 

 serial condition is developed. While the generic distinction is not too 

 sharply defined, it seems better to retain Stomatopora for the strictly 

 uniserial species. 



The three genera, Stomatopora, Proboscina and Oncousoecia have so 

 much in common, especially in the nature of the ovicells, that sharp 

 distinctions are difficult. For the purposes of the present treatise they 

 will be considered as genera on the following zoarial basis: 



Stomatopora, uniserial, except immediately around the ovicell, which 

 is simple, inflated, and may be slightly lobate, the ooeciostome terminal. 



Proboscina, biserial, or the linear branches may have several rows of 

 tubules, the ovicell simple, inflated, sometimes slightly lobate, the ooeci- 

 ostome terminal or nearly so. 



Oncousoecia, broadly multiserial, the zoarium rounded or with fan- 

 shaped lobes, the ovicell simple or slightly lobate, more depressed be- 

 tween the adjoining tubules, the ooeciostome terminal. 



Stomatopora granulata (Milne-Edwards), 1836 

 Plate 65, figs. 1 and 2 



Alecto granulata Milne-Edwards, 1838:205. 

 Alecto granulata. Busk, 1875:24. 

 Stomatopora granulata, Hincks, 1880:425. 

 Stomatopora granulata, O'Donoghue, 1923:11 ; 1926:17. 

 Stomatopora granulata, Borg, 1926:359. 

 Stomatopora granulata, Sakakura, 1935:37. 



