BRYOZOA. 615 



tablished name Yincularia. Both Vine and Shrubsole suggest 

 that the name Glauconome be retained for the G. disticha Lons- 

 dale. of the Wenloek shales. Perhaps d'Orbigny's name Penne- 

 retepora has a better claim. Should it prove upon investigation 

 that the Eifel species G. disticha Goldf. is again generically distinct 

 from both the Wenloek species and Pinnatopora, then all the 

 names might stand. In any event I believe we cannot do better 

 than to accept Pinnatopora as defined by Vine. 



All the American species described under Glauconome have 

 the characters of Pinnatopora. There are four from the De- 

 vonian by Hall, and one each by Meek and White from the 

 Coal Measures. Fifteen or sixteen species referable to the genus 

 have been described from the Carboniferous deposits of Europe, 

 and one lately, from the Coal Measures of Ohio, by Foerste. 

 The following new forms bring the total number to 29 or 30 

 species*. 



On plate LVI will be found figures of five species of the genus 

 illustrating variations in internal structure. In P. elegans, P. 

 conferta and P. trilineata. the zooecia form two distinct ranges 

 in both the midrib and branches, in P. retroflexa, those of the 

 midrib are somewhat lozenge-shaped, so that the cells of each 

 range are in contact only at their pointed extremities, while, in 

 P. laxa. they form one range in both midrib and branches. The 

 other species present each some slight intermediate modification 

 of zocecial form and arrangement. Hemisepta are, as a rule, 

 but little developed in Pinnatopora. but in P. trilineata, they 

 are exceptionally strong. 



PINNATOPORA YOUNGI Ulrich. 



PL LXVL fig. 3. 



Zoarium pinnated, comparatively strong. Midrib strong, 

 averaging 0.6 wide, with the reverse side broadly convex and 

 finely striated. Obverse side somewhat flattened, with a strong, 



* In December, 1888, (Bullet. Laboratories Denlson Univ., VoL 4.) the author pub- 

 lished d scription and figures of five additional species. These are from the Cuyahoga 

 shales of the Waverly series of Ohio. 



