BRYOZOA. 287 
Diplotrypa neglecta.] 
DreLoTRYPA NEGLECTA, ”. Sp. 
Fig. 19. Diplotrypa neglecta Ulrich, base of Galena limestone, Hader, Goodhue county, Minnesota. 
Collection of E. O. Ulrich. 1 and 2, two tangential sections, x 18, and 3, a vertical section, similarly 
enlarged. 
Zoarium a small subconical or hemispheric mass, about 12 mm. in diameter and 
8 mm. in hight. Tube walls thin, transversely rugose, appearing quite irregular 
and rough in longitudinal fractures. Zocecia about nine in 3 mm., not regularly 
arranged, polygonal, largely in contact with each other, the mesopores being few in 
number and variable in size and distribution. Clusters of large zocwecia occur and 
among these the mesopores may be more abundant than in the intermediate 
spaces. 
In transverse sections we see cells of all sizes up to 0.45 mm., and not infre- 
quently it is difficult to discriminate between the smaller zocecia and the mesopores. 
As is shown by vertical sections the two sets of tubes are not totally distinct, 
the mesopores being in many cases clearly superseded by zocecia. Perhaps on 
account of the rugosities of the walls the mesopores often appear as developed 
periodically. The diaphragms are irregularly distributed, from one-half to four 
times their diameter distant in the large tubes and averaging about 0.15 mm. apart 
in the mesopores. i 
Though possessing all the essential characters of the genus, the internal irregu- 
larly and other peculiarities of the species are so obvious that comparisons are 
unnecessary. 
Formation and locality.—Lower part of the Galena limestone, at Hader, Goodhue county, Min- 
nesota. It is here associated with Mesotrypa (?) rotunda Ulrich, Plectambonites gibbosus W .and S., 
Pleurocystites angulatus Ulrich, Fusispira ventricosa Hall, and other fossils described in this volume. 
