NO. 1 OSB URN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 179 



JulHen apparently drew his generic description entirely from Hincks' 

 brief description and figure of C. furcata and the species and genus do 

 not seem to have been given any later study. It may be added that the 

 fertile zooecia have a wider aperture than the infertile ones (see Hincks' 

 illustration, 1882, pi. 20, fig. 5) ; the lateral oral spines are not always 

 bifurcate and are often wanting, and that communication is by multi- 

 porous septiulae. 



There is a question as to whether Metracolposa Canu and Bassler 

 (1917:34) is congeneric with Reginella. The Eocene, Middle Jack- 

 sonian, genotype, M. robusta Canu and Bassler, 1917:33, and some other 

 Eocene species have vicarious avicularia. Otherwise they appear to be 

 similar to Reginella. 



Key to Species of Reginella 



1. Short, strong, flattened spinous processes on either side of the 



aperture 2 



Spinous processes wanting 3 



2. A single spine, usually bifurcate, on each side; ooecium with 



numerous pores, its width 0.30 mm furcata 



Two spines on each side, not or only slightly furcate ; ooecium 



with few pores, its width 0.40 mm spitsbergensis 



3. Apertural bar (proximal border) heavy, broad and mucronate. 



mucronata 



Apertural bar not unusually heavy, not mucronate 4 



4. Zooecia large (0.60 to 0.80 mm long), lacunar pores rounded, 



large nitida 



Zooecia smaller (0.40 to 0.55 mm long), lacunar pores narrow 



and slit-like mattoidea 



: >__ Reginella furcata (Hincks), 1884 

 Plate 28, fig. 3 



Cribrilina furcata Hincks, 1884:12. 

 Cribrilina furcata, O'Donoghue, 1923:30. 

 Reginella furcata, O'Donoghue, 1926:52. 



Zoarium encrusting. Zooecia moderate in size, 0.50 to 0.65 mm long 

 by 0.35 to 0.45 mm wide, distinct with deep grooves, regularly arranged 

 in quincunx. The pericyst is considerably inflated, formed by the fusion 

 of 6 to 8 pairs of costae, with or without a median keel. Each costa bears 

 2 to 4 oval lumen pores and between the costae there are 5 to 6 rounded 

 lacunar pores. The pair of costae which form the proximal border of the 

 aperture are not enlarged nor umbonate, but at most are slightly bowed 

 forward. The aperture is transverse, about 0.18 mm wide by 0.12 mm 

 long, rounded distally and transverse or a little incurved on the proximal 



