2G0 BULLETIN OF THE 



thickly iiigniented. At certain points it han^^s down in spherical sacs, which 

 will be described presently. Between this muscular layer and the inner surface 

 of the vertical walls uf the bell, below the pouches last mentioned, there is an 

 anastomosing network of vessels, which grows more intricate near the bell 

 margin, and finally ends in irregular dendritic marginal j^rolongations in the 

 lobes of the ])A\. This network of tubes is formed by interstitial growth 

 between the lower lloor and the inner surface of the bell. All the anastomos- 

 ing vessels unite near the ujjper part of the bell, and enter the stomach cavity 

 through sixteen radial tubes. Eight of these tubes pass directly from the 

 cavity of an otocyst to the stomach, gathering \\[> as it goes the network of 

 vessels, and eight others take a similar course from the tentacles to the central 

 chymiferous cavity. 



The common cavity into which these tubes open lies above the stomach 

 properly so called. It is a small circular recess, bounded by the inner wall of 

 the bell above, and the lower floor below. It occupies the central part of the 

 bell above the stomach, with which, however, it communicates by means of a 

 centrally placed opening in the floor. This chymiferous cavity is marked on 

 its periphery by thirty-two pouches, which hang down into the bell cavity from 

 its inner walls. These pouches are formed of baglike expansions of the lower 

 floor of the bell, and are commonly found inflated with fluid. At times, also, 

 they lose their contents, probably discharging it into the chymiferous cavity. 

 They have a deep brown color I'rom the growth of pigment in their walls, and 

 are probably organs for the secretion of a biliary fluid.* 



The chj^miferous cavity is probably homologous with the central cavity in 

 Cambessa Tagi.-f It lies above the stomach in normal positions of the medusa, 

 and communicates with it only through the central orifice already mentioned. 

 The stomach proper of Linerges is bounded on the sides by folds hanging down 

 from the inner bell walls and roofed over by the floor of the chymiferous 

 cavity. The lateral walls of the stomach are short, curtain-like structures, 

 which never project beyond the bell opening. The mouth is rectangular, 

 cross-shaped, resembling closely that of some genera of hydroid medusse. The 

 walls of the lips are crossed by eight rows of pigment spots arranged in four 

 pairs, each of which extends into one of the four divisions of the cruciform 

 mouth. 



Four clusters of gastral filaments are found suspended from the upper wall 

 or roof of the stomach, in positions corresponding with the four angles of the 

 mouth, and alternating with the extensions of the cruciform oral aperture. 

 Each filament is dotted with crimson pigment-spots. They are in constant 

 motion, and at times their extremities are found projected through the central 



* This conclusion seems to me more natural than that they are testes, sacs for the 

 reception of undeveloped ova or spermatozoa, organs of respiration, or kidneys. For 

 enumeration of their possible function and discussion of their homology, see llaeckel, 

 op. cit., p. 493. 



t Greuacher and Noll, AbhaucU. Seuk. GesulL, X. PI. III. fig. 3 (d c'). 



