262 BULLETIN OF THE 



mid not in the sacs banging from the inner walls of the hell.* The pUuiula 

 ■which follows the morula last described does not difler from the planula of 

 other medusa). It is an oblong spherical body richly ciliated and capable 

 of rapid motion. 



Intermediate stages of growth between the planula and that which is probably 

 the oph yra of Linenjcs were not observed, so that I cannot say definitely whether 

 Linerr/cs has a direct development or not. 



A medusa which resendjles Linerges very closely, and which may be its 

 ephyra, was found in great abundance in the water about Fort Jefferson (Tor- 

 tugas Islands) at the same time that Linerges was so common. f 



The shape of the youngest ephyra (fig. 4) is very similar to that of the 

 young Cyanea. The bell is fiat, disk-shaped, and with its margin continued 

 into eight pairs of prominent lappets, two of which are represented in the 

 figure. The walls of the bell have a yellow-brown color, and the surface 

 (uppei) is doited with small round pigment-spots. In the deep incisions 

 around the bell margin hang, alternating with each other, eight tentacles and 

 as many otocysts. The tentacles are suspended from the deeper and narrower 

 incisions of the bell rim, while the marginal sense bodies are found in the 

 remaining indentations which separate adjoining pairs of marginal lobes. 



The tentacles are single, hollow (?) bodies, which do not project beyond the 

 tips of the marginal lobes when extended. As compared to the diameter of the 

 bell they are relatively larger than the same bodies in Linerges. 



The marginal sense bodies resemble closely those of Linerges, and consist of 

 a single otolith of spherical shape enclosed in a capsule-like hood which is open 

 below (figs. 16-18). It differs from Linerges in possessing an ocellus or well- 

 marked black pigmented region at the base of the peduncle which bears the 

 otocyst. The existence of an ocellus in the young, and not in the adult, is a 

 very anomalous fact, and never before mentioned in any Discophore. It even 

 leads me strongly to doubt whether 1 am right in considering this ephyra the 

 young of Linerges. The ocellus of the ephyra is a complicated structure. It is 

 not a simple mass of black pigment-cells, but resembles the complicated eye- 

 spot of medusa) like the genus Tamoija. In the middle of the base there 

 is a lens-shaped, apparently transparent body, which rises above the surface of 

 the otocyst style, and around it, in which it seems to be imbedded, we find the 

 black pigment (fig. IT). In this regard it is different from the ocellus of most 

 DiscopJiora in which the ocellus seems to be a simple pigment-spot on the 

 peduncle of the otocyst. 



* An observation whieli disproves the tlioory that the subumbral pouclies are 

 receptacles for tlie developing young. 



t The resemblance between this ephyra and members of tlie family Ephyridcc, 

 Haeck. is very close. It approaches very near the genus Xausicaa, Haeck. The 

 figures of this epliyra made use of in my description were drawn from nature by A. 

 A^asbiz. 



