NORTH AMERICAN EARLY TERTIARY BRYOZOA. 477 



salient and placed eccentrically; 18 tentacles. The oral glands are much devel- 

 oped. 



Genotype. Rhamphostomella coxtata Lorenz, 1886. 



Range. Priabonian Recent. 



The only known fossil species is Rhamphostomella ~brendolensis Waters. 1891, 

 from the Priabonian of Vicentin. 



RHAMPHOSTOMELLA SIMPLEX, new species. 



Plate 8, figs. 11, 12. 



Description. The zoarium incrusts shells. The zooecia are little distinct; the 

 frontal is convex and formed of a pleurocyst very finely granulated. The apertura 

 is oblique, imbedded, hidden; it bears a very small lyrula. The peristome bears 

 two spines. The ovicell is hyperstomial, placed on the distal zooecia; it opens 

 largely above the apertura and in front of the avicularium ; it is formed of an area 

 with very fine pores surrounded by a scarcely distinct collar. The avicularium is 

 enormous, quite salient above the apertura ; it is always placed obliquely and opens 

 at the side of the apertura. The ancestrula is a small membraniporoid zooecium. 



. fZs=0.30 mm. 

 Measurements. /ooecia \, nnn 



[h 0.20mm. 



Affinities. This species is rather difficult to study because of its small dimen- 

 sions. Our specimens are well preserved, and at an enlargement of 40 diameters 

 they show very clearly the essential characters of Rhamphostomella in their more 

 simple and more regular manifestations. The areolae are very rarely visible be- 

 cause of their very small dimensions. 



Rhamphostomella simplex differs from Rhamphostomella convexa in its indis- 

 tinct zooecia and in the opening of the avicularium which is invisible exteriorly 

 and turned toward the apertura. 



It differs from Rhamphostomella brendolenis in the absence of the large 

 frontal avicularium. 



Occurrence. Wilcoxian (Bashi formation) : Woods Bluff, Alabama (rare^ . 



Cotypes.Cat. No. 63829, U.S.N.M. 



RHAMPHOSTOMELLA BRENDOLENSIS Waters, 1891, var. AMERICANA, new variety. 



Plate 62, fig. 11. 



1891. Rhamphostomella brcndolensis WATERS, North Italian Bryozoa, Quarterly Journal 

 Geological Society London, vol. 47, p. 23, pi. 3, figs. 10, 11. 



Description. The zoarium incrusts shells. The zooecia are little distinct, 

 elongated; the frontal is convex and formed of an irregularly and finely granu- 

 lated pleurocyst. It has no peristome ; the peristomice bears an asymmetrical sinus 

 placed between two very salient avicularia of which one is always larger than 

 the other; the apertura is oblique, deep, hidden; the lyrula is flat and rather long. 

 The ovicell is imbedded in the distal zooecia; it is little salient and smooth. On the 



