Yerrill^ JVotes on Radiata. 437 



lacerately divided into large, unequal, sliarp spinules. The stouter 

 spicula are in part sliort, stout, very roughly warted spindles ; with 

 more numerous and usually large, stout, iri-egular, very rough clubs. 

 The latter are bluntly pointed at the small end, the sides covered with 

 crowded rough warts, tlie large end lacerately divided into large, une- 

 qual and irregular, sharp spinules. Among the smaller spicula are 

 many short, irregular spindles, roughly warted on one side, and bear- 

 ing lai'ge, elongated, sharj), oblique spinules on the other ; also more 

 regular short warty spindles and warty heads ; others are quite slen- 

 der and very roughly warted spindles, often lacerate at one end. The 

 polyp-spicula are deep brown. 



The longer spindles measure -825™"^ by -175""", -825 by -162, -775 

 by -175, -750 by -250, '700 by -150, -675 by -125, '625 by -175, -025 by 

 •125, -550 by -175, -525 by '125; the stouter spindles -625 by -375, 

 •625 by -250, '475 by '200 ; the stout clubs "575 by '200, '575 by -175, 

 •550 by -200, -525 by -200, '450 by -250, ^450 by -175 ; the longer spi- 

 nules of the clubs are about -100 to '125 in length; the irregular lac- 

 erate spicula "475 by •325, ^225 by ^200 ; the smaller stout spindles "325 

 by •150, -275 by -125, -250 by -137; the Avarty heads -225 by •175, 

 •200 by -150; small slender spindles ^450 by -125, ^400 by •I 12, 

 •375 by -100. 



Acapulco, Mexico, — A. Agassiz. 



This species resembles M. puTpiirea and M. albida in its stout 

 branches and mode of subdivision, but diifers from both these and all 

 others in its nearly obsolete verrucjB, Its spicula are very different 

 in form and size from those of M. alhida. 



3. — Verrucas, curved ux)ward at the apex, generally more or less appressed and usually 



imbricated. 

 a. — Ccenenchyma thick ; branches stout, obtuse, dichofomous. 



Muricea albida Verriii. 



Muricea robusta (pars) Verrill, Proc. Boston Soc. Nat. History, vol. x, p 329, 1866. 

 Muricea albida YerrilJ, American Journal Science, xlv, p. 412, May, 1868. 



Plate VII, figure 9. Plate YIII, figure 10. 



Corallum white, dichotomous, Ijranching nearly in a plane, with 

 stout, ratlier long branches, thick ccenenchyma, and lai-ge, close, some- 

 what appressed verructe. 



Wlien young this species usually grows to the height of two or 

 three inches as a simj^le, straight, clavate stem, generally quite slen- 

 der at the base and gradually enlarging to near the summit, where the 

 diameter, including verrucae, is "20 to "35 inch, the end obtusely round- 



