1884.] NATURAL SCIENCES OF PHILADELPHIA. 205 



tufts, mixed with a small echinating, spinous acuate (? Dictyo- 

 cylindrus, Bk.). 



No. 37. Echinoclafhria? sp. Dense mass of compressed, 



proliferous, interuniting branches arising from a contracted base, 

 growing on the valve of an Area, terminating in compressed, 

 somewhat expanded divisions. Surface subhispid. Consistence 

 hard, tough. Color now brown. Bearing a parasitic polyp 

 (Palythoa). Fibre short-jointed, amber-colored, bearing three 

 forms of spicules, viz. : 1, robust, acuate with globular tubercu- 

 lated head, about 23 by 2 — 1800 in. in its greatest dimensions ; 2, 

 long smooth acuate, 20 by ^—1800 in.; 3, echinating spicule, 

 clavate, spined, small, 6 by i— 1800 in. (Note.— If the " tubercu- 

 lated head " is not an accidental form, it is a markedly distin- 

 guishing character.) 



No. 38. The same as No. 21. 



No. 46. Echinoclathria? sp. Fragment useless for general 



form. Flimsy branched, interuniting, ridged. Consistence firm. 

 Color now whitish gray. Fibre tough, short-jointed, amber- 

 colored, bearing two forms of spicule, viz. : 1 , large, long and short 

 robust acuates, less in diameter at the large end than in the 

 middle of the shaft; 2, echinating, short spinous acuate. 



Fam. 2. AXINELLIDA. 



Group 6. MULTIFORMTA. 



No. 6. Reniera digitata, Sdt. (Spong. Adriat. Meeres, p. 15, taf. 

 7, fig. 11.) Massive, sessile lobate. Surface cellular, roughened 

 by ridges and small processes. Consistence firm. Color orange. 

 Structure cellular. (? A species of the genus Higginsia, Higgin, 

 "Ann.," 1877, vol. 19, p. 291 ; vol. xiv, fig. 1.) 



No. 7. Higginsia coralloides, Higgin ("Ann.," 1. c). 



No. 15. Axinellid,? gen. et sp. Fragment shreddy, branching, 

 tough, brown color. Fibre short-jointed, very tough and amber- 

 colored, hispid, bearing three forms of spicules, viz. : 1, robust, 

 simple, acuate, long and short; 2, fine, long, setaceous, acuate ; 

 3, small, navicular anchorate, flesh-spicule. The acuates are 

 situated partly in and partly projecting from the fibre echin- 

 atingly, with the anchorate plentifully scattered about their base 

 of attachment. (? Glathria Sdt., Sp. Adriat. Meeres). 



No. 35. Axinella polypoides, Sdt. (Sp. Adriat. Meeres, p. 3, 

 taf. 6, fig. 4). 



No. 45. Higginsia coralloides, Higgin ("Ann.," 1. c). Erect 



