112 MKDUS.E OF THK WOULD. 



velum is well developed. There are 4 straight-edged, wide radial-canals and a broad circular 

 vessel. The manubrium is urn-shaped, quite wide, and with 4 cruciform, recurved lips. The 

 mouth is at a point about half-way between the inner apex of the bell-cavity and the velar 

 opening. The gonads are found in complexly folded regions upon the 4 interradial sides of 

 the stomach. The manubrium and tentacle-bulbs are yellow or greenish-yellow. The ento- 

 dermal core of the stomach is often orange. 



When about I mm. high (plate 1 1, fig. 5) the bell has a small apical projection. There 

 are 2 large tentacles and 2 rudimentary tentacle-bulbs, each with an orange ocellus. There 

 are no other ocelli upon the bell-margin. The manubrium is slender and urn-shaped, without 

 gonads and with 4 simple, cruciform lips. 



The young of this medusa are common at Tortugas, Florida, and in the Bahamas through- 

 out the summer. Although the medusa has usually but 2 long tentacles, occasionally one is 

 seen with 4 long, equally developed, radially situated tentacles. The mature medusa has not 

 been seen and we must remain in doubt concerning its generic position, for it may be a young 

 Turn's. The presence of ocelli upon the tentacle-bulbs distinguishes it from all other Ameri- 

 can species of Stornotoca and is a character commonly seen in Turns. 



I believe this medusa to be identical with Haeckel's " Codonorchis octaedrus," which he 

 obtained offthe Atlantic coast of France. Haeckel states that this medusa had 2 well-developed 

 tentacles and 10 tentacle-bulbs (2 perradial and 8 adradial). He described the ocelli as 

 brownish-red. Apparently he found but a single specimen and the interradial tentacle-bulbs 

 may have failed to develop. His medusa is described as having folded gonads, and is said to 

 be 4 mm. high and 2.5 wide. 



Stomotoca rugosa Mayer. 

 Plate 10, figs. 5 and 6; plate 11, figs, i and 2. 



Slomoloca afirala, FEWKF.S, 1881, Bull. Mus. Comp. Zool. at Harvard College, vol. 8, p. 152, plate 2, figs, i, 4, 9. HARC.ITT, 

 1901, American Naturalist, vol. 35, p. 581, fig. 40; 1904, Bull. U. S. Bureau of Fisheries, vol. 24, p. 35, i fig. (errone- 

 ously labeled Stomotoca apicata, female). RITTENHOUSE, 1907, Proc. Boston Soc. Nat. Hist., vol. 33, pp. 440, 445, 

 452, 456 (embryology). 



Stomotoca rugosa, MAYER, 1900, Bull. Mus. Comp. Zool. at Harvard College, vol. 37, p. 4, plate 2, fig. 5; Ihitl., p. 32. 



Amphinema u[titatuin, BROOKS, 1883, Studies Johns Hopkins Biol. Lab., vol. 2, p. 473. 



Bell 5 mm. high and 3 mm. broad. Solid, apical projection, in some individuals short and 

 blunt, in others long and slender. Bell-walls of moderate thickness, and bell itself, exclusive 

 of the apical projection, somewhat higher than a hemisphere, with relatively vertical, straight 

 sides. There are 2 long, diametrically opposed tentacles, which are of equal length, and when 

 stretched are fully ten times as long as the bell-height. They are, however, highly contractile 

 and may become not more than one-tenth as long as when fully expanded. The basal bulbs 

 of these long tentacles are large, hollow, and tapering and there are no ocelli. 



In addition to the 2 long tentacles there are 14 small, permanently rudimentary tentacles, 

 2 at the bases of 2 of the radial-canals and 3 in each interradial quadrant. These lack ocelli. 

 The velum is well developed. There are 4 wide radial-canals and a ring-canal, all with 

 jagged edges. The manubrium is quadratic and flask-shaped and the mouth in old medusae 

 is about at the level of the velar opening. The mouth is cruciform and there are 4 prominent, 

 recurved, crenulated lips. The mature sexual products are found in the ectoderm of the 

 adradial walls of the stomach on both sides of the places of entrance of each of the 4 radial- 

 canals where the surface is thrown into 8 series of complex folds and ridges, a double ridge of 

 folds in each interradius. 



The gelatinous substance of the bell is transparent, but the entoderm of the tentacle-bulbs 

 and stomach is brick-red, often streaked with sooty brown. The radial and circular canals are 

 faint red in color. Specimens from Tortugas, Florida, often show black streaks through the 

 brick-red color of the stomach and tentacle-bulbs, and medusae which have been confined in 

 aquaria for some days often become wholly black in these parts. 



Hydrotd and \onng medusa. Professor W. K. Brooks, 1885, describes the hydroid. 

 It is a Pi-rigfjniiniis, very much like P. niiniitiis Allman, 1871 (Monog. Tubularian Hydroids, 

 p. 324, plate xi, figs. 4 -6). It was found at Beaufort, North Carolina, growing upon the lower 



