66 



Cincitivati Society of Natural History. 



recognize from either description or figure. Besides the latter 

 is wrongly engraved and would thus mislead the student. No 

 indication whatever is given of the general form of the organ- 

 ism, nor of the presence or ab.sence of spicules. There is 

 scarcely anything that indicates a relationship to the type of 

 the genus, unless it be the lobes, of which, however, no ade- 

 quate idea can be formed. 



Genus ii. — Brachiospoxgia, Marsh, 1867. 



" Sponge in the form of a broad cup or vase, with a row of 

 projecting processes or arms around the periphery of the base, 

 and into which the gastral cavity extended. Osculum large, 

 not operculate. Afferent and efferent canal sy.stem well de- 

 veloped." (Beecher, C. E., Memoirs Peabody Mus., Yale 

 Univ., vol. 2, 1889, p. 13.) 



Reiimrks. — This genus was first described by O. C. Marsh 

 in Am. Jour. Sci., 2d ser., vol. 44, 1867, p. 68. The descrip- 

 tion given above is from a monograph of the Brachiospongidse 

 by Dr. C. E. Beecher. The description of the fir.st species is 

 from the same paper. 



I. — B. DiGiTATA, Owen (sp.), 1857. 



Broad, cup-shaped, or short vasiform, with a row of eight 

 to twelve arms projecting outwards and downwards from 

 periphery of base. Osculum elliptical; below osculum, walls 

 of cup or neck vertical, extending from 25 mm. to 40 mm., 

 and .slightly expanding below to origin of arms. Base of cup 

 concave, usually with strong conical or mammiform projec- 



Hk;. 6.—Hraihii>spi>iigia i/if:i/a/a, spicules, from iiuitr Mirfacc after llceclier). 



