NO. 1 OSBURN: EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 187 



Genus COLLETOSIA JulHen, 1886 



Costae separated by a row of small lacunae. Orifice semicircular 

 with oral spines. Avicularia vicarious or absent. The ovicell is hyper- 

 stomial. Dietellae present. (After Harmer, 1926:474). Genotype, Lep- 

 ralia endlicheri Reuss, 1874. 



Jullien's genus Colletosia was submerged for many years under Puel- 

 lina Jullien, 1886, but Harmer (1926:474) resurrected it. After study- 

 ing the genotype of Puellina, {Lepralia gattyae Busk), I fully agree with 

 Harmer that "this species does not seem to be congeneric with C. radiata" 



Jullien's original description of the genus does not conform in all 

 respects to that of Harmer, given above, as he states that the furrows, or 

 intercostal grooves, are entirely without pores and that there are no oral 

 spines. These are characters that are readily obscured in fossilization, 

 however, and as Harmer has made a careful study of the case the genus 

 Colletosia may be considered acceptable for radiata. 



)<^^ Colletosia radiata (Moll), 1803 



Plate 29, figs. 2 and 2a 



Cribrilina radiata, Hincks, 1884:14. 

 Cribrilina radiata, O'Donoghue, 1923 :30. 

 Puellina radiata, O'Donoghue, 1926:51. 

 Colletosia radiata, Harmer, 1926:475. 

 Colletosia radiata, Osburn, 1947:26. 



Zoarium encrusting, small white colonies on shells, worm tubes, 

 pebbles, etc. The zooecia are distinct, separated by deep grooves ; costate 

 area convex and covering nearly all of the frontal ; costae usually 7 or 8 

 pairs and between them radiating rows of small lacunae which are often 

 somewhat slit-like ; one or more small lacunae in a median position near 

 the aperture; an umbonate process sometimes present. Aperture semi- 

 circular, straight on the proximal border, with about 5 oral spines. Vicari- 

 ous avicularia, with an elongate mandible, irregularly distributed and 

 often wanting even on whole colonies. 



Ovicell rounded, smooth or radiately roughened, usually with a small 

 carina or umbo. 



There is a great deal of variation in most of the characters; size, 

 number of costae, amount of calcification, number and form of the pre- 

 apertural pores, the size and form of the avicularium, the size and distri- 

 bution of the setae, etc. and a number of nominal varieties have been 

 described. The best known of these is the Lepralia innominata Couch, 

 1844, which has been accepted as a distinct species by most authors, on 



