16 



MEMORIAL PAMPHLET SHOWING CERTAIN DRAWINGS 



The animal is transparent, excepting for the gonads, which are pale-yellow. 



This rare species was found by McCrady in 1857 in Charleston Harbor, South Carolina, 

 and Brooks has found it in abundance during the summer at Beaufort, North Carolina. I 

 believe it to be identical with the Mediterranean Persa. 



The figures of the medusa here presented were drawn from nature by the late Professor 

 William K. Brooks, who kindly presented them to me for use in this work. 



Genus CUNOCTANTHA Haeckel, 1879, sens emend. 

 Cunoctantha octonaria Haeckel. 



Cunina octonaria, MrCRADY, 1857, Gymn. Charleston Harbor, p. 109, plate iz, figs. 4, 5; Proc. Elliott Soc. Nat. Hist. Charles- 

 ton, S. C., vol. i, plates 4-7. AGASSIZ, L., 1861, Cont. Nat. Hist. U. S., vol. 4, p. 168. BROOKS, 1883, Studies Biol. 

 Lab. Johns Hopkins Univ., vol. 2, p. 467; 1884, Zool. Anzeiger, Jahrg. 7, p. 710; 1886, Johns Hopkins Univ. Circular, 

 No. 49, p. 86. MAAS, 1893, Ergeb. der Plankton Exped., Bd. z, K. c., p. 53. AGASSIZ, A., and MAYER, 1899, Bull. 

 Mus. Comp. Zool. at Harvard College, vol. 31, p. 166. 



Foreo/ia octonaria, AGASSIZ, A., 1865, North Amer. Acal., p. 51. 



Cunoctantha octonaria, HAECKEL, 1879, Syst. der Medusen, p. 316. BROOKS, 1886, Mem. Boston Soc. Nat. Hist., vol. 3, p. 

 361, plates 43, 44. WILSON, H. V., 1887, Studies Biol. Lab. Johns Hopkins Univ., vol. 4, p. 95, plates 1-3, 19 figs. MAAS, 

 iSgz.Zoolog. Jahrb. Anat.Abth., Bd. 5, Heft 2, p. 274. BIGELOW, H. B., 1909, Mem. Mus. Comp. Zool. at Harvard 

 College, vol. 37, p. 52, plates 14, 15, and 17. 



Mature medusa (plate 55, fig. i). Bell about " mm. in diameter, flatter than a hemi- 

 sphere. 8 tapering tentacles, somewhat longer than bell-radius, project from sides of bell 

 about midway between margin and apex; these tentacles are stiff and capable of but little 

 movement and are carried bent downward in scimitar-like curves. The entodermal core of 

 each tentacle consists of a row of disk-shaped, vacuolated cells. This core projects inward into 

 the gelatinous substance of the exumbrella, immediately above the middle of the outer edge of 

 one of the 8 radial stomach-pouches. The root of each tentacle, where it fits into the 

 gelatinous substance of the exumbrella, is thus covered with two -layers of ectoderm, one being 



FIG. 305. Larvae of Cunoctanlha attached to mouth of Turriiopsis nutricula. 

 From drawing by Prof. W. K. Brooks. 



continuous with the general ectoderm covering the exumbrella and the other is continuous 

 with the ectoderm of the main shaft of the tentacle. The ectoderm of the shaft of each tentacle 

 contains many nematocysts and also deep-lying muscle fibers. Just beneath and centrifugal 

 to each tentacle-root is a thick pad of ectoderm-cells. This is the "peronium" of Haeckel 

 and it probably serves to support the tentacle that arises immediately above it. 8 loops of 



