58 Cincitinad Society of Natural History. 



vSponge body ovoid in form, i% X i X iH inches, the lower 

 ])()rtion having been ground oflF to observe the interior. A 

 series of lines are observable on different parts of the speci- 

 men, running parallel with each other, without any seemingly 

 definite starting point, not bifurcating, and in some cases with 

 very fine lines crossing at right angles. Where ground oflF 

 the specimen shows no structure except numerous small pits, 

 small particles of carbonaceous matter and some irregular 

 lines. Nothing that can be considered spiculae have been 

 observed, unless the parallel lines be regarded as such. 



Locality. — Cincinnati, Ohio. 



Remarks. — The s])ecimen upon which this species is founded 

 is in the collection of the late Mr. U. P. James, and was referred 

 by him to "R. discum, Whitfield (?)"' It differs from that 

 species in the much larger size and different form. The exact 

 horizon of the specimen is unknown. 



Genus 7 — P.\scEOLrs, Billings, 1857. 



Free, ovate or subglobular; exterior surface marked by 

 polygonal plates and with one or more circular apertures ; base 

 with or without point of attachment. (Rept. Prog. Geol. vSur., 

 Canada, i853-"54-'55- 56-'57. P- 342-) 



Remarks. — The zoological affinities and position of the genus 

 are uncertain. It has been placed among the Tunicata, the 

 Foraminifera, and in the place here given to it. The proba- 

 bilities seem in favor of its being one of the Spongida. It 

 was so placed in a previous article, "Protozoa of the Cincin- 

 nati Group," by the present writer (Jour. Cin. Soc. Nat. Hi.st., 

 vol. 9, 18.S7, p. 248). A similar form. Cyclocrinus, was re- 

 garded as a Cystidian, and as also one of the Zoantharia. 



I. P. (JLOHOsr.s, Billings, 1857. 



Hemispherical or subglobular; two or three inches in di- 

 ameter, base flattened, plate (?) impressions polygonal, or hex- 

 agonal, about two lines in diameter and without external 

 openings (Geol. Sur., Canada, Rept. Prog.. i853-'54-'55~"5^">~ 



'57. P- 343)- 



l,oiality. — Cincinnati, Ohio. 



Remarks. — Tliis is mainly a Trenton species, but it has been 

 found in a lew localities about Cincinnati. 



