426 Verrill, JVotes on Radlata. 



Tlie spicula are reddish brown, mostly very large, thick, coarse, 

 unequal, and irregular, with the ends obtuse or truncate, and the 

 surface rough with minute crowded warts. In the verrucse the spic- 

 ula are mostly very stout spindles, oval, oblong, or clavate, in nearly 

 all cases irregular, but generally with one end largest and truncate, 

 obtuse, or divided into two forks or lobes. Their most common size is 

 about half a millimeter in diameter and two long, but there are many 

 much larger ones, and a few quite regular and slender spindles of 

 smaller size. Those of the coenenchyma are mostly very large, thick, 

 oblong, irregular spicula, obtuse, truncate, or irregular at the ends, 

 mostly bent or distorted and often lobed, most of the larger ones 

 about one-third as broad as long. 



The stout spicula of the cells measure 3-20'"™ by -875'"™, 3-12 by 

 •600, 2-25 by •875, 2-12 by -575, 2*00 by "575, 2-00 by '500, 1-75 by -675, 

 1-75 by -375, 1-70 by -800, 1-45 by '575, 1-40 by -875, 1-37 by -300, 

 1-25 by -575, 1-07 by -325, -875 by '450. Those of the coenenchyma 

 4-00 by 1-25, 4-00 by 1-20, 3-25 by 1-00, 287 by 1'25, 2-75 by r25, 

 2-75 by -875, 2-25 by '950, 2-25 by "800, I'OOby -450 ; the most slender 

 spindles 1-75 by -225, -f-OO by -200; the smaller ones -650 by -125, -525 

 by 125, -450 by '125 -275 by 150. 



Pearl Islands, — F. H. Bradley. 



This species is very difierent from all others in its great size, very 

 large, coarse, rough verruca;, and the remarkably large, thick, irregular 

 spicula. 



Muricea echinata Vai. 



Muricea echinata Valenciennes, Comptes-rendus, 1855 (no description); Edw. and 

 Haime, Corall., vol. i, p. 143, 1857 ; Verrill, Bulletin Museum Comp. ZooL, p. 36 ; 

 Proc. Bost. Soc. Nat. Hist, vol. x, p. 328, 1866. 



Plate VIII, figure 6. 



Corallum ii-regularly dichotomous or subpinnate, branching nearly 

 in a plane, with clavate branchlets and elongated echinate verrucae, 

 with the lower lip prolonged and the cells opening upwai-d and inward. 



The trunk usually divides, close to the base, into two or three main 

 branches, most of which subdivide several times at distances of one 

 third or half an inch, the central ones usually dichotomous and the 

 outer ones often subpinnate, the branches spreading at first at a wide 

 angle and then curving upward. The terminal branches and branch- 

 lets are mostly from one to four inches long, enlarging toward the 

 end, often distinctly clavate, the tips enlarged and obtusely rounded. 

 The verrucse are mostly slender, clavate, very prominent, especially 

 on the terminal branchlets, not crowded, spreading outward and up- 



