﻿American Palaeozoic Bryozoa. 



49 



make it desirable to separate them generically from Fistulipora. The 

 zocecia in having the wall thin anteriorly, and much thicker posteriorly, 

 resemble those of Cheilotrypa, but here the resemblance, excepting in 

 characters common to the family, appears to cease. Yet, if the central 

 laminae, which, as I have described, do not extend to the margins of 

 the branch, were, instead of being grown together, separated so as to 

 form a tube, we would have all the essential characters of that genus. 

 Although these suggestions imply that the species is more nearly re- 

 lated to Cheilotrypa than to the typical forms of Fistulipora, I have 

 decided, provisionally, to refer it as above. When my investigations 

 shall have been completed I may be able to make a better disposition. 

 The discovery ot capillary tubes between the median laminae in F. (?) 

 clausa is highly interesting, as such tubuli are characteristic of Pachy- 

 dictya, Ulrich, and other forms now placed with the Stictoporidm. 



The compressed branches of this species will distinguish it from all 

 associated Bryozoa. 



Formation and locality : Common in the Kaskaskia Group, at Tate- 

 ville, Ky., and many other localities in Kentucky and Illinois. 



Cheilotrypa, n. gen. 



Zoaria ramose, branches with a small, irregularly expanding and 

 contracting central tube, to which the lower or inner ends of the 

 zooecia are attached. Zooecia with the posterior portion of the wall 

 usually thickest, gradually thinning on the sides until it is linear at 

 the front; cavity elliptical in tangential section; aperture oblique, the 

 lower portion strongly elevated. Interstitial spaces vesiculose; vesicles 

 open except near the surface, where they are more or less filled and 

 obscured, by a dense, apparently homogenous, deposit of sclerenchyma. 

 Zooecial apertures sometimes closed by an operculum. Diaphragms 

 wanting or few. 



Type: C. hispida, n. sp., Kaskaskia Group. 



Only two species have- been examined that I can with certainty refer 

 to this genus. These are the type species, and Trematopora ostiolata, 

 Hall, from the Niagara Group in New York. Superficially, the las 

 resembles the Trematopora osculum, Hall, from equivalent rocks in 

 Indiana, in a striking manner. Sections, however, prove beyond a 

 doubt that they are very distinct, T. ostiolata being unquestionably 

 congeneric with Cheilotrypa hispida, and T. osculum, as undeniably, 

 a species of Coeloclema, a genus of the Ceramoporidaz. The longi- 



