The Paleontologist. [July 2, 



I have one example varying from the above in being but a single layer, having grown 

 upon a flat surface — about one-half an inch square — and become detached ; there is no 

 distinguishable difference in the upper or outer surface markings from the above, but the 

 under or interior surface (which cannot be seen in the cylindrical forms), is w^rj' different 

 from the outer, having the appearance of net work with alternating series of long oval or 

 lozenge shaped meshes, radiating from central points. 



I have a number of specimens of amorphous masses from about one to three inches in 

 diameter which resemble this species in the mode of growth, and may be identical, but 

 the surfaces being considerably weathered, and partly overgrown by other species, it is 

 difficult to make them out clearly. 



Locality — Cincinnati. 



GENUS HIPPOTHOA, (Lamouroux.) 



Hippothoa delicatula, (James.) Polyzoary creeping, adnate. branching dichoto- 

 mously, and sometimes anastomosing. Branches linear, about one-tenth of a line in 

 diameter. Cells uniserial, each growing by a pointed base from the cell below, and ex- 

 panding gradually to the mouth ; two or three cells in the space of a line. Apertures 

 terminal, elevated, and nearly or quite the diameter of the cells, and placed on their front 

 face. 



This is an exceedingly delicate species and is found attached to corals and other 

 substances. 



Locality — Cincinnati. 



GENUS ORTHOCERAS, (Breynius.) 



Orthoceras Hindei. (James.) Shell small, semi-cylindrical, tapering gradually, 

 sometimes to a long slender point. Septa varying from less than three-quarters of a line to 

 over a line in width, and generally forming about half a circle. Transverse sections of 

 specimens embedded in rock as well as detached ones show this semi-cylindrical outline of 

 the shell, and in some cases, a cylindrical siphuncle. In specimens showing the interior, 

 the siphuncle appears like an elevated roughened ridge, with a central longitudinal groove 

 of variable depths in different specimens ; in one case the siphuncle approaches a cylin- 

 drical beaded form, divided into sections by the Septa; this specimen seems to have two 

 series of Septa, the outer one much more oblique than the inner. In cases where the 

 siphuncle is absent the interior of the Septa have a rounded corrugated appearance, and 

 sort of overlapping arrangement. A longitudinal section through the thickest part of the 

 shell shows an oblique arching of the Septa. 



It seems as if the head and upper end and the whole length of the under side of this 

 species was destitute of a shell or hard covering, consequently we find only the portions 

 here described, the soft parts having disappeared entirely. I have collected and exam- 

 ined nearly one hundred specimens; the general forms and features are as stated. Speci- 

 mens vary in size from one-half an inch to three inches in length, and from one-quarter 

 to three-quarters of an inch transversely at the upper end. 



I am indebted to Mr. S. T. Carley for good specimens of this fossil, and especially for a 

 fine longitudinal section. 



Named in honor of Geo. J. Hinde, Esq., Geologist and Paleontologist, of Toronto, Canada. 

 Locality — Cincinnati. 



GENUS CYCLONEMA, (Hall.) 



Cyclonema (?) minor. (James.) Shell very small; consisting of about 3 regularly 

 rounded whorls, decreasing in size quite rapidly to the apex. Suture rather deep ; body 

 whorl ventricose ; aperture circular or oval; outer lip thin; inner lip somewhat thick- 

 ened and partly covering a shallow umbilicus. Whorls closely set with quite prominent 

 transverse costa. No longitudinal lines on the whorls. The distinguishing characters of 

 this species are the sharp transverse costae and absence of longitudinal lines on the whorls. 



Shell about one line in diameter, measuring through the body whorl, and a little more 

 in height. Placed in the genus Cyclonema provisionally. 



Locality — Cincinnati. 



GENUS STROPHOMENA, (Rapinesque.) 



Strophomena (?) Ulriehi. (James.) Shell small, thin, fragile; length and 

 breadth about equal — from ^ to >^ an inch. Cardinal line a little more or a little less 

 than the widest part of the shell ; lateral margins rounding regularly to the front ; ventral 



