CORALS AND BRYOZOA. 273 



GLAUCONOME, Goldfuss. 1826. 



(See page 101.) 



Glauconome CARINATA. 



plate lxvi. figs. 23, 24. 



Glauconome carinata. Hall Trans. Albany Institute, vol. x, p. 196. 1881. 

 " " " Report of State Geolog-ist for 1883, p. 60. 1884. 



ZoARiUM consisting of a midrib or rachis proceeding from a spreading base, 

 attached to foreign bodies, and having slender, equidistant, lateral branches, 

 which preserve the same manner of growth as the primary rachis; celluliferous 

 on one face only ; midrib from .30 to .35 mm. in width ; transverse section 

 broadly sub-cuneiform ; the non-celluliferous face flattened, and with three 

 prominent ridges, one at each margin and one along the middle, sometimes 

 equally elevated, at other times the central one is the strongest and has 

 the appearance of a carina. The lateral branches have a width of about .18 

 mm., and are regularly distant from each other between two and three times 



. the width of a branch, very nearly on a plane with the rachis, flattened and 

 with a slender striation along the middle, sometimes minutely granulose. 

 On the celluliferous face the midrib and branches are sub-angular. Cell aper- 

 tures circular, in two ranges, one on each side of the midrib and branches, 

 opening almost directly outward, separated by from once and one-half to 

 twice the diameter of an aperture, fifteen in the space of 5 mm. Peri- 

 stomes comparatively strong, equally elevated. Lateral branches depressed 

 below the cell apertures of the midrib. Ranges of apertures sepa- 

 rated by comparatively prominent carinae, the midrib being much the 

 strongest. 



Numerous fragments of this species have been observed, it being not 

 uncommon ; on all the specimens the lateral branches are very short, the 

 length not exceeding .50 mm., and very frequently less. This species may be 

 distinguished from any other, at present known, by its small size and the three 

 comparatively prominent striae or ridges on the non-cellulifer ous flattened 

 face of the rachis. 



