1884.] NATURAL SCIENCES OF PHILADELPHIA. 203 



Fam. 2. HIRCINIDA. 

 Group 3. HiRCiNiosA. 



No. 23. Hircinia? sp. Massive, erect, lobate. Surface 



even, minutely reticulated ; projecting arenaceous tags ; con- 

 sistence resilient. Color now brown. 



No. 26. Hircinia ? sp. Fragment too insignificant for de- 

 scription. 



No. 31. Hircinia tubulosa, Crtr. Consisting of a conical mass 

 of erect tubular processes. Consistence resilient. Color light 

 sponge. Fibre scantily cored with arenaceous substance (named 

 after its form). 



No. 36. Hircinia ? sp. Sessile, with solid cylindrical erect 



branches or processes interunited. (>onsistence resilient. Color 

 now sponge-brown. ? = No. 23. (Note. — As the fibre of these 

 Hircinide was invested with sarcode diflferent from the color of the 

 fibre itself, there is no saying what color the latter was in its 

 natural state.) 



No. 52. Hircinia ? sp. Sarcode destroyed by Spongio- 



phaga communis^ Crtr. (See " Parasites of the Spongida," Ann., 

 1878, vol. ii, p. 168.) Look at the white substance under a micro- 

 scope, to see the filaments of the parasite. 



No. 53. Hircinia? sp. Branched; branches solid, cylin- 

 drical. 



No. 54. Hircinia ? sp. Has grown over sedgy leaves. 



No. 55. Hircinia ? sp. Sessile, composed of erect conical 



tubes. 



Group 16. Arenosa. 



No. 59. Spongelia, Sdt., ?avara, Sdt. 



No. 57. Spongelia avara, Sdt. Red sarcode (Sp. Adriat. Meeres, 

 p. 29, taf. 3, fig. 6). 



No. 51. Spongelia^ Sdt. ? sp. := Dysidea, Bk. Fragment 



much worn. 



No. 44. Spongelia, Sdt. ? sp. 



No. 43. Dysidea, Bk. Like No. 39, but fibrous. ? Spongelia, 

 Sdt. 



No. 24. Spongelia, Sdt., ? pallescens, Sdt. (Sp. Adriat. Meeres, 

 p. 28). Dysidea, Bk. 



No. 39. Dysidea tenerrima, Crtr. Merely sarcode and sand 

 producing " columnar " structure. No fibre ; thus bearing much 

 the same relation to the Hirciniosa that the Holorhaphidota do 



