194 ANNALS NEW YORK ACADEMY OF SCIENCES 



Dyscritella inaequalis sp. nov. 



Zoarium ramose, brauching freely at intervals of about 16 mm. Branches 

 slender. 4 mm. in diameter. Cortical zone well defined, .5 mm. or less in 

 thickness. Zocecia thin-walled and longitudinal in the median portion of the 

 stem, rather abruptly changing to a radial direction in the cortical zone, 

 where the walls are considerably thickened. Apertures oval to circular and 

 arranged with some regularity, usually 8 in 2 mm., probably moi'e when the 

 oval apertures are measured in lines passing through their short diameters. 

 The apertures seldom exceed .14 mm. in diameter. Mesopores fairly numer- 

 ous, of varying size, much smaller than the zooecia, between which they occur 

 as a rule in single rows. Occasionally, however, the zooecia have no meso- 

 pores between them (laterally), and occasionally the mesopores are grouped 

 in more than single rows. Acanthopores are fairly abundant and of two 

 sizes, the larger ones perhaps the more numerous. Three or four of the larger 

 and one or two of the smaller occur around each zocecium. The walls are 

 rather thicli, their diameter being usually equal to or greater than the short 

 diameter of the mesopores, which are apt to be elongated. They are suffi- 

 ciently thick, so that the larger acanthopores, which are very large, do not 

 indent the walls. TabuliP appear to be entirely lacking in both zooecia and 

 mesopores. 



Stenopora perattenuata sp. nov. 



Zoarium in the form of thin expansions having a discoidal or infundibuli- 

 form shape, more or less contorted. Lower surface with a concentrically 

 wrinkled epitheca. The size is large for the thickness, which only measures 

 one half to 1 mm., while the diameter may be 50 mm. or more. 



In some sections, the zooecia appear to rise directly from the epitheca. but 

 others show that there is a brief prostrate portion. The zooecia are rather 

 regular, so that a hexagonal shape and a linear arrangement are locally some- 

 what conspicuous. In size, they vary, and it is possible that there are niaculte 

 of larger cells. Owing to the tendency noted above as to shape and arrange- 

 ment and the fact that the hexagons are apt to be wider than long, as many as 

 8 may be counted in 2 nun. when measured through a short diameter, but ordi- 

 narily only 6. The zooecial walls are moderately and regularly thickened, but 

 not annulated. A more or less obscure median line, lighter than the rest, can 

 be made out. Diaphragms are irregularly developed, in some cells none at all. 

 in others one or two. Acanthopores and mesopores appear to be altogether 

 absent. 



The extreme thinness of the zoarium, the apparent absence of acantho- 

 pores and the non-annulated condition of the walls distinguish this form 

 from other species of Stenopora. In fact, in a general way it is sug- 

 gestive of Proutella, but it fails to show the peculiar characters of that 

 genus. 



Stenopora longicamerata sp. nov. 



Zoarium apparently massive, hemispherical. The present material consists 

 of a single specimen having an irregularly conical shape. The longest diam- 



