REPORT ON THE DEEP-SEA MEDUSAE. xli 



umbrella cavity, but at the distal end of a free solid gastral peduncle. The radial canals 

 originating; in the bottom of the stomach run in the ectodermal outer surface of the 

 cylindrical gastral peduncle (which is often also quadrangularly prismatic, pyramidal, or 

 conical) to the bottom of the umbrella cavity, turn over on to the subumbrella, and run 

 in it to the umbrella margin. The longitudinal muscles which move the gastral peduncle, 

 alternate with its ascending radial canals. The solid gastral peduncle frequently 

 resembles the hollow, and likewise proboscis-shaped oesophagus of the Craspedotse and 

 has often been confounded with it. The gastral peduncle is never found among the 

 Acraspedse, but is very frequent in all four orders of the Craspedotae. It is most 

 strongly developed in a part of the LeptomedusEe (Saphenidse) and Trachomedusse 



Fig. C. Odorchis germanica (Leptomedusa;, Eucopidai). 



Profile view, (ug) Gelatinous umbrella, (us) Solid gelatinous peduncle of the stomach, (v) Velum. 

 (cm) Velar marginal vesicles, (tp) Perradial tentacles, (ti) Interradial tentacles, (s 1 ) Distal testis 

 (on the subumbrella). (s-) Proximal testis (on the oesophagus). (cj>) Perradial canals, (g) Stomach. 

 (al) Oral lobes. 



(Geryonicke). (Comp. System, taf. iv. xh. xiii. xviii. xx.). In a portion of the 

 Geryonidse it runs out still further below, past the central part of the umbrella peduncle 

 and forms a pointed cone, projecting freely like a tongue into the hollow space of 

 the stomach, which is fastened below to the gastral peduncle (System, taf. xviii. fig. 5). 

 This tongue-like cone (" conus lingualis," " glossoconus ") is perhaps an organ of taste. 



§66. Umbrella margin ("margo umbrellae," um). The umbrella margin forms the 

 lower or distal boundary line of the umbrella, at which its two walls, the dorsal and the 

 ventral wall, pass into one another ; at the same time the exumbral epithelium of the 

 convex dorsal umbrella (qe) proceeds directly at this boundary line into the subumbral 



(ZOOL. CHALL. EXP. PART XII. — 1881.) M / 



