NICK LES AND BASSLER.] DIAGNOSES OF GENERA. 33 



most flosel}' sot in the earlier portion of the short mature region; 

 mesopores sometimes numerous, sometimes few, with closely set dia- 

 phragms; acanthopores small, few, or wanting. 



Genotype: Eridotrypa inutahilis Ulrich. Range, Ordovician- 

 Devonian. Ten described and four new species. 



Stenopora Lonsdale (Tubuliclidia Lonsdale, Tabulipora Young). 



Zoarium ramose, sublobate, massy, laminar, or parasitic; surface 

 smooth or with monticules; walls of zooecia thickened periodically in 

 the mature region; diaphragms sometimes verj^ few, but in most 

 American species abundant in the mature region and perforated cen- 

 trally; mesopores never very numerous, irregularly distributed; large 

 acanthopores at the junction angles. 



Genotype: Stenopoi'a tasmanierisis Lonsdale. Mississippian, Car- 

 boniferous. Seventeen described and three new species. 



Anisotrypa Ulrich. 



Zoarium ramose, branches sometimes hollow and lined by an epitheca; 

 divisional line between adjoining zooecia (as seen in sections) sharply 

 defined, periodical swelling of walls more or less marked; diaphragms 

 centrall}^ perforated, usually numerous; interspaces generall}" ridge- 

 like; neither acanthopores nor mesopores. 



Genotype: Anisotrypa syinmetrica Ulrich. Mississippian. Four 

 species. 



LiocLEMA Ulrich. 



Zoarium ramose, lamellar, subglobose or incrusting; surface fre- 

 quently exhibiting distinct monticules or macular; zooecia with sub- 

 circular or irregularly petaloid apertures, separated by abundant 

 angular mesopores, which in some species are open at the surface, in 

 others closed; diaphragms few in the zocecia, abundant, sometimes 

 crowded in the mesopores; acanthopores numerous and strong in the 

 tj^pical species, small and inconspicuous in others. 



Genotype: Callojjoraj?unctata Hall. Range, Silurian-Mississippian. 

 Twenty-nine described and five new species. 



LiocLEMELLA Foerste. 



Zoarium cylindrical, rareh^ branched, pointed at the base (for articu- 

 lation?); otherwise much as in Lioclema. 



Genotype: CaUopora ohwensis Foerste. Ordovician, Silurian. Six 

 described and five new species. 



Bull. 173 3 



