OEGANTSMS IN ACADIA. 147 



II.— MONERA A- ]SAI>IOL.ARIA (?) 



Among the micro-organisms found in cavities of the sponges of the Basal series are 

 some which appear to belong to these divisions of the animal kingdom. 



On removing the calcite infilling which now conceals thom, they may be found 

 attached to the walls of the cavities of the sponge. Many of the siliceous concretions in 

 these cavities are amorphous, but among these are found solitary individuals or groups of 

 organisms which have a definite shape. Some of these are here figured and described. 



These objects (except the fourth described) are amber-colored, and hyaline, and have 

 been preserved by silicification. They are placed here, awaiting fuller inibrmation on 

 their nature. 



MONADITES n. gen. 



Minute spherical or oval bodies, with or without pedicels. Cuticle horny or mem- 

 branaceous (?) covered with minute pores or hairs. 



MONADITES GLOBULOSUS, n. sp. (PI. VII, fig. 1 a-b.) 



Little spherules covered with minute pores. These little bodies occur scattered or are 

 aggregated in cavities of the sponge. Sometimes they show pedicels, and have connect- 

 ing threads. These are much more abundant than the other minute forms herein 

 described, and may have an organic relation to the sponge. 



Size. — About J of a mm. 



Horizon and Locality. — Red sandy shales of Basal series at Caton's Island. 



MONADITES PYRIFORMIS, n. sp. (PI. VII, figS. 2 n~b.) 



Pyriform, stalked, with a dark spot or opening at the extremity ; surface covered with 

 minute pores (and hairs ?) 



Size. — Length, about 1 mm. ; width, about ^V mm. 



Horizon and Loralilij. — Same as the preceding. 



These are found attached to the sides of the sponge cavities, and sometimes one 

 appears to have grown from the side of another. 



MONADITES URCEIFORMIS, n. S^l. (PI. VII, fig. 3.) 



Broadly urn-shaiied with a closed (?) distal extremity beset with minute spines. The 

 swollen part of the body has on each side a group of dark spherules implanted on the 

 surface. On the narrow part of the base is a projection which may be the shrunken 

 representative of a pedicel. The contracted distal extremity is a hyaline, and of a 

 different texture from the rest of the body. 



Size. — Length, about \ mm. ; width, about ,t mm. 



Horizon and Locality. — As the preceding. 



