156 



PROTOZOA. 



[CAM. — CHI. 



robusta, Williamson, 1880, Mem. Org. of 

 the Coal Meas., pt. 10, Up. Held Gr. 



Fig. 95.— Calcisphsera robusta. a, natural size; 

 6, magnified, snowing sculpture ; c, showiug 

 aperture; d, magnified, showing aperture ; e, 

 section of wall magnified. 



Camarocladia, Ulricb & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 280. [Ety. 

 kamara, arching chamber; klados, twig.] 

 Small, subcylindrical branching stems ; 

 interior canals irregular, separated by 

 thin, cribrose walls; spicules three- 

 rayed. Type C. dichotoma. 



dichotoma, Ulricb & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 281, Tren- 

 ton Gr. 

 Caunopora, Phillips, 1841, Pal. Foss., Corn- 

 wall and Devon, and W. Somerset, p. 

 18. [Ety. chaunos, loose ; poros, perfora- 

 tion.] Amorphous, composed of con- 

 centric or nearly plain masses, per- 

 forated by flexuous or vermiform small 

 tubuli, and by larger, straight, sub- 

 parallel or radiating open tubes, per- 

 sistent through the mass. Type C. 

 placenta. 



hudsonica, Dawson, 1879, Quar. Jour. 

 Geo. Soc., vol. 35, p. 52, Niagara Gr. 



incrustans, Hall & Whitfield, 1873, (Strom- 

 atopora incrustans,) 23d Rep. N. Y. 

 St. Mus. Nat. Hist., p. 227, CheniuuL' 

 Gr. * 



mirabilis, Spencer, 1884, Bull. No. 1, 

 Univ. St. Mo., p. 47, Niagara Gr. 



planulata, Hall & Whitfield, 1873, 23d 

 Rep. N. Y. St. Mus. Nat. Hist, p. 228, 

 Chemung Gr. 



walkeri, Spencer, 1884, Bull. No. 1, Mus. 

 Univ. St. Mo., p. 46, Niagara Gr. 



Fig. 96.— Caunopora walkeri, vertical and hori- 

 . zontal section enlarged. 



Ckrionites, Meek & Worthen, 1868, Geo. 

 Sur. 111., vol. 3, p. 346. [Ety. herixm, 

 honey-comb; lithos, stone.] Founded 

 upon casts apparently holding an inter- 

 mediate position between Pasceolus 

 and Receptaculites. The pits are hex- 

 agonal and upon the convex side, per- 

 forated in the center by a minute circu- 

 lar opening, while those upon the 



under side are imperforate. Type C. 

 dactyloides. 

 dactyloides, Owen, 1 844, 

 (Lunulites dacty- 

 loides,) Rep. on Min. 

 Lands, p. 69, Niagara 

 Gr. 



Chirospongia. n. gen. Fig. 97.— CerlonltM 

 [Ety. cheir, hand; dactyl.. i 

 spongia, sponge. ] 

 General form hand-like, or somewhat 

 like a compressed goblet ; composed of 

 internal filamentous or fibrous sub- 

 stance, which is covered with a thin, 

 lobed, vesicular parenchyma ; it was 

 firmly fastened by an expanded base 

 to a solid rock or the sea- bottom; above 

 thebaseitisa flattened obconoidal cup, 

 with a deep sulcus down the middle of 

 each side, bringing the sides nearly to- 

 gether ; on each side of the sulcus the 

 interior of the sponge is hollow, show- 

 ing a large gastral cavity; the whole 

 skeleton is openly vesicular or porous. 

 The type species is silicified, and doM 

 not show the surface markings, hut a 

 calcareous specimen, supposed to be- 

 long to the same genus, is finely papil- 

 lated. No microscopic sections have 

 been made to ascertain the character 

 of the spicules, but doubtless both 

 parenchyma and fibrous substance bear 

 spicules similar to those of Brachio- 

 spongia. In the surface lobes and fila- 

 ments it resembles Pattersonia, but is 

 distinguished by its vesicular and por- 

 ous substance and coarser filaments. 

 In its large gastral cavity, thin skeleton, 

 and vesicular parenchyma, it resembles 

 Brachiospongia. Type ('. wenti. 



Fig. 98.— Chirospongia wenti. 



faberi, n. sp. This species is founded 

 upon a calcareous fragment of the pa- 

 renchyma, about one-third of which is 

 shown in the figure. It is thin, and 



