954 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. [2<S] 



minimum described in 1882, flat, discoidal. about ()'"'" iu diameter; the 

 exumbral surface (Fig. 1) smooth, walls gelatinous, slight convex, white 

 or light-straw colored in alcohol. The marginal prominences {mg. p.) 

 have a markinl difference from those of the type. In one specimen 

 (Station 2034) the bell as seen from the exumbral surface shows the 

 tips only of the eight marginal prominences. In another (Station 2041) 

 the tubercles are very prominent on the prominences. This also holds 

 true in a majority of the specimens. In one of two specimens from Sta- 

 tion 2216 the transparent part of the bell is inflated so that it is almost 

 spherical. This condition is thought to be the result of the contraction 

 of the bell margin. 



The region of the bell upon which the tubercles of the margin of the 

 umbrella are best seen is the subumbral (Figs. 2, 3). The tuberculated 

 elevations {my. p.) are invariably eight in number, and are colored light- 

 brown, almost amber-colored in some cases. Individual papillse are 

 simple, coni(ial elevations, of which there are three or more (generally a 

 regular arrangement) side by side on the bell margin. There is com- 

 monly one of these tubercles which is more axially placed than the 

 others on the upper surface of the umbrella. * The great degree of hard- 

 ness attained by these tubercles, as well as the whole umbrella margin, 

 is a noticeabh; characteristic in several specimens. The marginal prom- 

 inences are destitute of tentacular appendages, and in the best pre- 

 served specimens there was nothing to indicate that they are homolo- 

 gous to similar appendages in some Pectyllida'. Their homology and 

 function is unknown to me. In all cases the structure of the stomach 

 and the vehnium {vel.) couhl not be made out on account of the con- 

 tracted condition of the specimens. The whole structure of the me- 

 dusa, as far as known, shows that Halicreas belongs somewhere among 

 the Narcomedusai of Ilreckel, as I have already stated in my original 

 description of the genus. It has certain affinities with the family of 

 Pectyllidte, but differs very greatly from the genera which have been 

 described by Hseckel. 



Faraily SOLMAEID^, Hteckel, 1877. 



SOLMARIS INCIISA, SJ). nov. 

 (Plate IX.) 



A medusa closely allied to Solmaris is represented in the collection by 

 several specimens. These are at present })laced in a new species of Sol- 

 maris. Some of these specimens are simply fragments, containing, how- 

 ever, the greater part of the umbrella margin ; some are in a good state 

 of preservation. I was at first led to suppose, from the resemblance of 

 the margin of the umbrella to the marginal lobes or lappets of certain 

 members of the family of EphyridiTB, that these specimens are close rela- 

 tives of that family. A study of the other organs, especially a careful 



