262 BULLETIN OF THE 



and not in the sacs hanging from the inner walls of the hell.* The pianola 

 which follows the morula last described does not differ 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 ephyra of Linerges were not observed, so that I cannot say definitely whether 

 Linerges has a direct development or not 



A medusa which resembles 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 flat, 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 

 (upper) is dotted 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 Tamoya. 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 Beems to be imbedded, we find the 

 black pigment (fig. 17). In this regard it is different from the ocellus of most 

 Discophora in which the ocellus seems to be a simple pigment-epot on the 

 pedumle of the otocyst. 



* An observation which disproves the theory that the suhumbral pouches are 

 receptai lea for the developing voting. 



t The resemblance between this ephyra and members of the family Ephyridtt\ 

 Haeclc is very close. It approaches rery near the genns Nausicaa, Raeck. The 

 fignres of t hi-> ephyra made use of in my description were drawn from nature by A. 



iz. 



