456 Yerrill, Notes on Radlata. 



Callipodium Pacificum Verriii. 



Sympodium Pucz^ca Verrill, Proc. Boston Soc. Nat. Hist, vol. x, p. 329, 1866. 

 Erythropodium Pacificum Yerrill, Amer. Jour. Sci., voL slv, p. 415, May, 1868. 



Plate V, figure.22. Plate IX, figure 1. 



Corallum red, encrusting, spreading over the surface of stones and 

 shells, either as broad, rather thin sheets, which are usually irregular 

 and often interrupted, or in the form of stolon-like expansions, which 

 may be broad, or quite narrow, and are often reticulated, as in the 

 specimen figured. 



Verrucse irregularly and usually distantly scattered, sometimes a 

 little crowded, on the stolons often arranged in a single series, quite 

 large, usually very prominent and more or less conical, with a rounded, 

 eight-rayed summit; sometimes, when fully contracted, having the 

 form of low rounded warts. Coenenchyma rather thin, firm, very spic- 

 ulose, its surface, like that of the verruca?, strongly granulose with 

 the small rough spicula. 



Color, when dry, bright red ; in alcohol a deep, clear red. When 

 living, " dull brick-red to purplish red. Polyps, when fully closed, 

 mere pimples on the surface, when expanding they show first a low 

 rounded cone, marked with pointed grouj^s of red spicula, between 

 which now come forth the nearly transparent polyps, which have eiglit 

 small, acvite, pinnate tentacles, swollen at base, suiTOunding the mouth 

 of the opaque, pinkish white stomach. Height from attachment to 

 summit of tentacles -20 inch ; diameter -05, " — F. H. B. According 

 to Mr. Bradley's outline sketch of the expanded polyps, the tentacles 

 are very acute, and the pinnse, which are confined to the outer half, 

 are long and slender. 



The largest specimens in the collection almost completely cover por- 

 tions 3 inches by 1*5 on the surface of the stones ; thickness of coenen- 

 chyma, when dry, '02 to "03 ; height of verrucEe above the surface "04 

 to "10, average about '06 ; diameter "05 to "08, average about '07. The 

 breadth of the stolons in the reticulated specimens varies from '05 to 

 •25, the narrow parts being extremely thin. 



The spicula are bright red, very roughly but distantly warted, and 

 very diversified in size and form. The larger ones are partly short, 

 stout, blunt spindles, with few (often not more than twelve) large, dis- 

 tant, rough warts ; partly of three, four, five, and six-pronged star-spic- 

 ula, each branch or prong terminated by one or several rough warts ; 

 pai'tly of very roughly warted heads; and of various irregular, very 

 rough forms. The small spicula agree in their forms, to a considerable 

 extent, with the large ones, but in addition to the spindles, heads, and 



