58 



Descriptions of Nein Species of Fossils 



cell-apertures equal to the diameter of the apertures. Length of 

 cylinder 80 mm., diameter at the base 55 mm., diameter at the sum- 

 mit about 45 mm. ; length of cell tubes in the thickest portion of the 

 cylinder 10 mm. 



This species is described from a portion of an individual broken 

 longitudinally through the middle. The fragment is covered with 

 bryozoa rendering some of the characters obscure. It is readily dis- 

 tinguished by its sac- like form from all other species known in this 

 horizon. 



HYDROZOA. 



Dendeogeaptus (s.g. Chaunogeaptus) novellus n. sp.- 



Fossil occurring free in the shales, or upon other fossil bodies, in 

 slender branching fronds. Branches diverging, lax and slender, with 

 numerous branchlets, both marked by numerous cellules which are 

 usually indicated by the appearance of abrupt expansion and contrac- 

 tion of the branches. 



The angular projection of the cell-aperture can be observed in 

 many parts of the fossil. 



This species is more lax and diffuse than any form of Dendeo- 

 geaptus known to me, and I therefore suggest a separation from' the 

 typical forms of the genus. It occurs free among other fossils, or 

 attached to some fragmentary portions of other bodies. In its habit 

 of growth it is quite distinct from any of the forms heretofore illus- 

 trated or that have come under my observation. 



Inocaulus divaeicatus n. sp. 



Frond ramose, regularly branching about every 10 mm. by dich- 

 otomous division. Branches straight, diameter 2 mm., diverging at 

 an angle of nearly 85°, giving the frond a somewhat rigid appearance. 

 Exterior structure composed of numerous irregular, longitudinally 

 striated, branching filaments, connected by slender dissepiments, 

 forming rows of small, irregular, sub angular cell-apertures. 



This species is distinguished from Z jt^^imM/osws Hall (^Pal. JV. Y., 

 vol. ii, p. IVe), by its rigid, slender, diverging branches, and by the 

 absence of the projecting, imbricating scales forming the cell-margins. 



The specimen here described furnishes some additional evidence 

 regarding the intimate structure and nature of Inocaulus. 



