REPORT ON THE DEEP-SEA MEDUSAE. 109 



are the same as in all those Tesseronise, whose iuterradial septa or cathammata are merely 

 small short nodes, not long selvages. 



The sixteen coronal pouches (" bursas coronares ") which form the middle zone of 



the coronal intestine, go out from the distal margin of the coronal sinus; they are 



alternately broader and narrower, and are divided from each other by the sixteen 



subradial septal selvages, which form the proximal processes of the sixteen subradial 



lobe clasps (figs. 4-15, M). Their inner or axial wall forms below the sixteen coronal 



areas of the coronal muscle, its outer or abaxial wall the sixteen pedalia of the 



umbrella. Each coronal pouch divides below (at the distal margin of the coronal 



muscle) into three csecal terminal branches, of which the two lateral enter the 



inverted halves of the two adjacent marginal lobes, whilst the middle passes either 



into a rhopalium or into a tentacle. The eight narrower ocular pouches (bo) (four 



perradial and four iuterradial) extend to the eight rhopalia, in whose ampullae their 



middle terminal branch ends cascally. The eight broader tentacle pouches (bt) are 



much wider, and contain the distal halves of the genitalia, which are fastened to their 



subunibral wall ; their middle terminal branch passes into the basal part of the 



tentacles ; they project a considerable way into the umbrella cavity (figs. 5,6). Of 



the eight ocular pouches, the four perradial are somewhat longer than the four 



iuterradial, as they spring from the coronal sinus rather higher up than the latter. 



This explains how in the transverse section of the umbrella only eight radial pouches 



appear immediately below the simple coronal sinus (fig. 4). The four narrow, 



perradial ocular pouches (bo^ alternate with four very broad wide pouches (br 2 ) which 



contain the upper proximal ends of a pair of genitalia ; rather further down they 



divide into three pouches, a middle iuterradial ocular pouch and two lateral adradial 



tentacular pouches (fig. 5). This comportment of the coronal pouches is best seen 



by comparative consideration of the longitudinal section (figs. 14, 15) and the transverse 



section (figs. 3-8). It is also worthy of remark that the subunibral endoderm of the 



ocular pouches rises into high papillae and folds, corresponding to the sterigma of the 



tentacular pouches (figs. 4-8). 



The thirty -two lobe pouches (" bursas lobares," hi) fill in pairs the proximal half 

 of the sixteen marginal lobes, whilst the delicate thin-membraned distal half of the 

 lobes remains free (figs. 12, 14, hi). The two pouches of each lobe are separated by the 

 subradial lobe clasp (hi) and belong to two different adjacent coronal pouches, an Oakl- 

 and a tentacular. As the rhopalia lie considerably deeper than the insertions of the 

 tentacles, the sixteen ocular lobe pouches are much shorter than the sixteen tentacular 

 lobe pouches. The distal ends of both lie, however, in the same horizontal plane. The 

 peripheric corona of pouches in Nauphanta, therefore, shows essentially the same 

 conditions of formation as in Pelagia. 



The genitalia (PI. XXVII. figs. 4-8, s; PI. XXVIII. figs. 12-16, s) in both sexes 



