294 BULLETIN 100, UNITED STATES NATIONAL, MUSEUM 



Genus RAGIONULA Canu and Bassler, 1927 



The ovicell is hyperstomial, opening into the peristomie, not 

 closed by the operculum. The frontal is (in appearance) a very 

 thick, granular pleurocyst. The apertura is semicircular. The peri- 

 stomice bears a pseudorimule bordered by a small eccentric peri- 

 stomial avicularium. The operculum and the mandible are of the 

 type of Porella. 



Genotype. — Ragionula {Eschara) rosacea Busk, 1856. Recent. 



Fig. 124. — Genus Ragionula Canu and Bassler, 1927 



A-N. Ragionula rosacea Busk, 1856. A-E. Different aspects of zoaria, natural 

 size. F. Adult zooecia, X40. G. Ovicelled zooecia. (After Norman, 1868.) 

 H. A young zooecium showing the avicularium before it is enclosed in the peri- 

 stomice, X40. (F, H. After Hincks, 1880.) I. Aspect of the marginal zooecia 

 and the basal lamella. J. A zooecium seen in profile. K. Portion of a zoarium 

 in which the zooecia are indistinct and ornamented with an avicularium. L. The 

 poriform avicularium, much enlarged. (I-L, after Smitt, 1867.) M. Operculum, 

 X85. N. Mandible of peristomial avicularium, X250. (M, N. After Waters, 

 1900.) 



Waters, 1900, has figured the operculum of the genotype; it is the 

 operculum of a Porella. The genus would then belong to the 

 Smittinidae where, however, the oral avicularia are median. We 

 know that external appearances are very deceiving and that the 

 deduction of Waters is quite logical. Canu and Bassler have figured 

 the Smittinidae ornamented with tubules. 10 



In order to facilitate determination we leave the genus provi- 

 sionally in the Stomachetosellidae. 



"North American Early Tertiary Bryozo.i, pi. G-', flg. 7, pi. 64, fig. 22, pi. 95, flg. 7. 



