19G Systematic Paleontology 



Description. — Spherical, consisting of minute spicules uniting to form 

 a series of delicate, straight canals which radiate from the center of the 

 sponge and increase by bifurcation. The canals open upon the surface by 

 polygonal orifices. The minute structure of this species was worked out 



Fig. 3. — Diagram showing the manner in which spicules unite to form canals 

 (modified from Rauff). 



by Eaufl ' and subsequently discussed critically by Hinde," Ulrich,' and 

 Girty.' 



Fig. 4. — Sketch showing the interlocking spicules of Hindia fibrosa (after 

 Rauff). 



Eauff showed that it consists of spicules, each of which bears -i rays 

 which diverge from a common center. Three of the rays are stout, slightly 



' Sitzungsber. der Niederrh. Gesell. in Bonn, Sitzung von Mai 10, 1886, pp. 

 163-172. 

 = Ann. Mag. Nat. Hist., 1887, ser. v, vol. xix, p. 75. 

 ^ Geol. Survey 111., 1890, vol. viii, p. 226. 

 ♦ 14th Ann. Rept. N. Y. State Geol. for 1894, p. 263. 



