204 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



lobe, but narrower. Mouth-papillae large, stout, subacute, usually three 

 on each side of the jaw, the outermost thicker than the others, which 

 are compressed. Arm-spines numerous, long, slender, tapered, sub- 

 acute, translucent, rough with small acute spinules; the upper spines 

 on the two or three joints just beyond the margin of the disk are longer 

 than the rest, being considerably longer than the diameter of the arm; 

 on the second joint beyond the disk the two rows nearly meet on the 

 dorsal side, there being ten in each row; farther out the number is soon 

 reduced to seven or eight, the upper ones longest, the lower ones short. 

 Cnder arm-plates, near the base of the arms, short and broad, with a 

 small central angle on the proximal edge; the distal edge curved. Far- 

 ther out they rapidly become narrower and longer, the proximal angle 

 becoming more prominent and the lateral edges being incurved, while 

 the distal edge is convex. The ventral plates are separated by the side 

 arm-plates. Diameter of disk, 11™™; length of arms, 45™™ to 50™™; of 

 longest arm-spines, 4™™. Color, in alcohol, yellowish white. 



Taken on the eastern slope of George's Bank, in 220 fathoms, and pre- 

 sented by Captain Anderson and crew, of the schooner "Alice G. Wun- 

 son." 



PORIPERA. 



Cladorhiza grancfis, sp. nov. 



A large and remarkable species, with a strong, branched root, a long, 

 stout, round, unbranched stem, and a very thick, elongated, club-shaped, 

 compact body, from which a large number of lateral jirocesses diverge, 

 on all sides, nearly at right angles, so as to resemble somewhat an In- 

 dian warclub. The lateral processes are long, round, enlarged at base, 

 and swollen or clavate toward the end, which terminates in a fascicle of 

 Blender setae ; other clusters of setae project from and roughen the sur- 

 face of the swollen end. These lateral processes are arranged irregu- 

 larly, but rather uniformly, and often appear to form eight to ten or more 

 irregular rows, but are more commonly without order, and about half 

 an inch apart at base, diverging on all sides, more or less ciu'ved to one 

 side or downward, the lowest and the uppermost somewhat shorter; 

 their number, on the largest specimens, amounts to a hundred or more, 

 while in the smallest observed there are about twenty; they are tubular, 

 the small central tube connecting with larger cavities in the body of the 

 sponge, at their bases ; the internal cavity is lined with long, slender, 

 longitudinal spicula, and their external surface is roughened with small 

 projecting spicula, while the surface of the sponge-body is compara- 

 tively smooth. A large central bundle of long spicula runs through the 

 whole length of the stem and body, and subdivides so as to go into all 

 the branches of the root, which subdivides irregularly into numerous 

 branches, differing in the different specimens. Color, in alcohol, yel- 

 lowish white or clear white. 



Height of largest examples, about 18 inches; diameter of the stem, 0.5 

 inch; of body, 1.5 inches; length of lateral processes, 1.5 to 2 inches; 

 their diameter in middle, about 0.15 to 0.20 mch. 



A moderate-sized specimen is 220""" high; the root (imperfect) is about 



