REPORT ON THE DEEP-SEA MEDUSAE. 19 



colour from the dark violet subumbrella. In transverse section (fig. 12, ce) the circular 

 canal shows a high circular fold projecting nearly half-way into the lumen at its lower 

 marginal edge, which touches the basis of the velum (yc); the high cylindrical partly- 

 pigmented epithelium of this fold has probably a glandular nature like the similar folds 

 and tufts in the annular canal of Pectyllis. 



Pedis is specially distinguished by the blind centripetal canals proceeding from the 

 annular canal, as these are wanting in the closely-related genera Pectyllis and Pec- 

 tanthis, although they are indicated in the latter by the eight adradial projections of the 

 circular canal, which alternate with the eight radial canals (PI. VII. figs. 11, 20, ce). On 

 the whole, the centripetal canals of Pedis comport themselves like those of Olindias among 

 the Petasidse, and of Glossoconus and Carmarina among the Geryonidas, but they are 

 shorter and broader, and have the form of a pointed equilateral triangle (fig. 20, ce). 

 Their aggregate number amounts to 80 to 100, as 11 to 13 centripetal canals lie between 

 each two radial canals, with the starting-point of their broad basis touching the 

 circular canal. Although their number and arrangement is not perfectly regular, the 

 (primary) adradial centripetal canal (in the middle between each two traversing 

 radial canals) is always the largest. Then follow the (secondary) centripetal canals, 

 which lie in the middle between the former and the latter, whilst the remaining- canals 

 are considerably smaller and irregularly distributed (comp. PL VI. figs. 1 1 and 20 ; 

 PI. V. fig. 2). 



The eight genitalia (PL V. fig. 2, bs ; PL VI. fig. 11) in Pedis as in Pectyllis 

 (PL IV. fig. 3) are wide, folded, thick-walled pouches, which occupy the proximal half 

 of the radial canals and communicate with the lumen of the eight radial canals by a 

 wide fissure. The eight mesogonia or " genital mesenteries," which connect the genitalia 

 with the aboral half of the oesophagus, as broad radial lamellae in Pectyllis and 

 Pedanthis, are rudimentary in Pedis (fig. 2, ivr). In the only specimen examined (a 

 female) the wide cavity of the reproductive pouch was empty for the most part, and 

 only contained a few ova. 



Pedanthis, 1 Hasckel, 1879. 



Trachynemidaa with eight genitalia in the course of the eight radial canals, without 

 centripetal canals. Genitalia halved by eight radial mesogonia or leaf-shaped mesenterial 

 bands, and connected with the base of the stomach. Oral cavity without oral funnels 

 and without side pouches. Tentacles with sucking-cups very numerous, divided into 

 sixteen separate bunches, each tw r o bunches between two radial canals; sixteen subradial 

 auditory clubs, one in the middle of each bunch of tentacles. 



The genus Pedanthis is distinguished from the two other known Pectyllidae from 



1 ri/i«T;j, firm, compact ; £i/ioc, a flower. 



