Verrill, Notes on Radiata. 381 



Panama, nortli of the railroad-wharf, on sand at extreme low- 

 water, abundant on one occasion only, — F. II. Bradley ; Panama, — 

 J, II. Sterubergh, Capt. J. M. Dow, T. Kowadl, Esq.; Pearl Islands, 

 dredged on muddy bottoms, 4 to 6 fathoms,— F. H. Bradley ; Acajutla, 

 San Salvador, — F. II. Bradley ; Zorritos, Peru, dredged on muddy 

 .bottom, — F. H. Bradley. 



The single white specimen, referred to above, was found at Panama 

 with the ordinary variety. The irond, apparently owing to injury or 

 disease and subsequent restoration, is divided into three nearly equal 

 lobes by two deep lateral notches and the sinus. The polyps are not 

 retracted and appear a little larger than usual. The spicula are pure 

 white and apparently somewhat smaller than in other specimens. 

 This species has but little resemblance to M. reniformis of the south- 

 ern Atlantic coast of the United States, being much larger, with 

 smaller, more crowded, and far more numerous polyps, while the frond 

 is broader than long, instead of longer than broad. The color is 

 also much deeper and brighter, and the under surface rougher. It re- 

 sembles It. patula Verrill, from Cumana, Venezuela, more than any 

 other species, but can scarcely be confounded even with that, since it 

 differs considerably in form and color and in the size of the polyps, 

 and has a thicker frond. 



Family, Pexnatulid^. 

 Leioptilium undulatum Verrill. 



Proceedings of the Essex Institute, iv, 1865, p. 182. 



Basal portion smooth, pointed at the end, swelling into a large bulb 

 just below the pinna?. Posterior part of the body, except along a 

 narrow median band, covered with large verruciform rudimentary 

 polyps, forming rounded papilla;, some of which are a tenth of an 

 inch in diameter. Pinna? large, very broad and rounded, with nar- 

 row bases, the edges thrown into undulations or frills. Polyps rather 

 large, arranged in three alternating rows along the edges of the pin- 

 na?. Axis very slender, about two inches long, extending from about 

 an inch above the basal end to about the middle of the pinnate por- 

 tion. The naked base, of a specimen 4-25 inches long, is I'VS ; the 

 largest pinnte '75 long and 1-1'2 wide. This specimen has twenty-five 

 pinna^ on each side. 



Pinnacati Bay, Gulf of California, — Mr. Stone. (Smithsonian 

 Institution). 



