610 IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



of the braehiopod ribs is scarcely obscured. At inter\^als from 

 this spreading base, according to Ulrich, this species throws up 

 "irregularly branched shoots, one mm. or thereabouts in diame- 

 ter at the basal portion, and somewhat more higher up." These 

 branches are wanting in the specimen at hand but there is some 

 evidence that one or two may have been present but are now- 

 broken off. 



Zoecial apertures of the encrusting base are from .20 to .25 

 mm. in diameter when measured along the diagonal rows. Me- 

 sopores few; acanthopores conuiion. 



One of Doctor Ulrich 's figured specimens from Pella encrusts 

 a crinoid stem ; on this specimen the bases of the broken branches 

 are prominent, another illustration exhibits one of the branches. 



Occurrence. — ^Ste. Genevieve, Pella beds, on Lizard creek, Web- 

 ster county, Iowa. 



Batostamella (a new species) 

 Plate XII, fig. 20. 



Zoarium branching, main stem (judging from the single frag- 

 ment at hand) flattened oval to nearly round in cross section, 

 branches more nearly circular than the stem; main stem and 

 branches appar&ntly hollow, wall of the stem about 0.5 mm. thick. 

 Apertures oval, seven or eight in the space of two millimeters ; 

 interspaces thick, mesopores few, acanthopores ( ?) large. 



Doctor Bassler labelled this specimen "new species, — in Ulrich 

 collection." The meager amount of material at hand makes it 

 unwise to attempt complete specific description ; more specimens, 

 it is hoped, from which tangential and vertical sections may be 

 cut, eventually A^dll be obtained. 



Occurrence. — Ste. Genevieve, Pella beds, one-fourth mile above 

 mouth of Lizard creek, Webster county, Iowa. 



Anisotrijpa fistulosa Ulrich 

 Plate XII, fig. 27. 

 1890. Anisotrypa fistulosa Ulrich, Gool. Surv. 111., vol. VIII, pt. 

 ii, p. 448, pi. LXXII, figs. 6-6c. 

 Zoarium composed of one layer about one millimeter thick 

 coating a fra.gment of braehiopod shell, presumably that of Or- 

 thotetes JiasJiaskiensis. Quoting Doctor Ulrich — "Surface gen- 

 erally smooth, at intervals of three or foni- mm. with clusters of 

 apertures of larger size than the average, which in rare instances 

 are slightly elevated, A few small cells usually present near the 



