SCYPHOMEDUSAE 



391 



Fig. II. Desmonema chierchiana, Vanhoeffen. 

 Sector of the bell with many canals in the lappets 

 after injection with Delafield's haematoxylin. Many 

 rows of thin tentacles (torn away). X i. 



and the ocular ones 20-25 mm. Both are about 55-60 mm. long. The lappet zone is here 

 relatively narrow in comparison with the length of the radial pouches. The circular 

 muscle bands of the latter are very well developed and separated by sixteen thin septa. 

 There are many fine radial muscles in 

 the distal parts of the pouches, but none 

 in the lappets. 



The oral arms are torn away. There is 

 a short manubrium about 15 mm. in 

 length; the subgenital ostia are oval in 

 shape and ± 25 mm. wide, and the arm 

 pillars 7 mm. broad. 



There are eight groups of tentacles 

 arranged in 4-5 nearly straight rows 

 adjacent to the outer edge of the circular 

 muscles. All are torn away as if cut off 

 at the base with a knife. The largest are 

 in the innermost row ; about 50-60 in all 

 per group, and thread-like. 



There are 14-18 branches of radiating 

 vessels in the tentacular lappets, the inner- 

 most straight, running parallel, the lateral 

 bent outwards. The branching is much simpler than in the specimen figured by 

 Vanhoeffen (1908, Taf. ii, fig. 2) and restricted mainly to the distal parts of the canals. 

 There are here many more canals, which are, however, much narrower than in 

 D . gaiidichaudi (compare Fig. 10 with Fig. 11). 



The colour of the bell is light yellowish, the subumbrellar muscles pinkish yellow, 

 the vessels in the lappets whitish, the gonads yellowish. 



This species is very common in the neighbourhood of the Falkland Islands. 



Family ULMARIDAE, Haeckel, 1877 

 Sub-family STHENONIDAE, L. Agassiz, 1862 

 Genus Phacellophora, Brandt, 1838 

 Phacellophora ornata (Verrill) 

 (PlateXV, fig. 6; Fig. 12) 

 St. 270. 27. vii. 27. 13° 58' 30" S, 11° 43' 30" E, Elephant Bay, Angola. Kelvin tube^, 200-0 m. 



The single specimen is 20 mm. in diameter. The gelatinous substance of the bell is 

 very thin and fragile; the umbrella is vasiform, very irregularly covered with larger or 

 smaller nematocyst warts. 



There are sixteen marginal sense organs and thirty-two rhopalar lappets; the latter 



1 It is remarkable that this specimen was caught by the Kelvin tube which is intended only for the 

 collection of bottom samples. 



