BRYOZOA. 119 
Proboscina. ] 
Genus PROBOSCINA, Audouin. 
Proboscina (part.), AUDOUIN in Savigny, Desc. de l’Egypte, Pol., p. 236, 1826. 
Proboscina, d’ORBIGNY, 1852, Pal. Fr. terr. cret., t. v, p. 844. HAtme, 1854, Bry, de la form. Jurass., 
p. 10. Ulrich, 1882, Jour. Cin. Soc. Nat. Hist., vol. v, p. 149, and 
1890, Geol. Sur. Ill., vol. viii, p. 368. 
Not Proboscina, of Smirr and others. 
Zoaria wholly adnate. Zocecia as in Stomatopora, excepting that they are more 
or less immersed and not uniserial, being arranged in two or more contiguous rows. 
For remarks relating to this genus see under Stomatopora. 
PROBOSCINA TUMULOSA, %. Sp. 
PLATE I, FIG. 24. 
> 
Zoarium adnate, branching dichotomously, or inosculating, in the latter case 
forming an irregular large-meshed network. Branches narrow, generally with two 
or three, rarely four or five, alternating series of cells. Zocecia subpyriform, or 
obovate, not wholly immersed, generally appearing as bulbous swellings on the sur- 
face of the zoarium. Apertures subterminal, contracted, circular, slightly oblique, 
about 0.09 mm. in diameter, with a slight peristome. About five or six cells in 
3.0 mm. 
Compared with Proboscina frondosa (plate I, fig. 28) and P. auloporoidea (both 
Nicholson, sp.), two Hudson River forms, this species is distinguished by its shorter 
and more bulbous zocecia, their shape being more like those of Stomatopora inflata 
and Berenicea minnesotensis. The resemblance to the last is so marked that I would 
not be surprised if coming discoveries prove P. tumulosa directly descended from it. 
Formation and locality.—Rare in the upper third of the Trenton shales at St. Paul; more abundant 
in the same beds near Cannon Falls, Minnesota. 
Mus. Reg. Nos. 7620, 8047, 8101. 
Progosorna FRONDOSA Nicholson. 
PLATE I, FIG. 28. 
Alecto frondosa NICHOLSON, 1875. Pal. Ohio, vol. ii, p. 266. 
Proboscina frondosa ULRICH, 1889. Contri. to the Micro-Pal. of Canada, pt. ii, p. 28. 
A figure, taken from an excellently preserved example of this species, is intro- 
duced for the better understanding of, and comparison with, Minnesota Cyclostomata. 
This specimen is from the hill quarries at Cincinnati, Ohio, but the species also occurs 
in the upper beds of the formation at many localities in Ohio, Kentucky and Indiana, 
at Nashville, Tennessee, Wilmington and Savannah in Illinois, and at Stony Moun- 
