ANTHOMEDUSAE 



23 



Bythotiara murrayi Giinther 1903 



1903 Bythotiara murrayi Giinther, p. 424. PI. 10, figs. 4, 5. 



1953 Bythotiara murrayi RxisseW, p. 215. PI. 13, fig. i. Text-figs. 113A, b; 114.^, b; 115, 116. 



Occurrence: St. 81. 18. vi. 26. 32" 45' S, 08° 47' W. North-east of Tristan da Cunha. Net: N 450 B 65o(-o) m. 

 I specimen, 17 mm. wide. 



St. 1606. 31. X. 35. 26° 15' 48" S, 12° 18' E. Off Ichabo Island, South-West Africa. Net: TYFB 190-0 m. i speci- 

 men, 26 mm. wide, 21 mm. high. 



Distribution. Mediterranean. North-East Atlantic as far north as Norway. West coast of Africa off 



the mouth of the Congo River. Mainly found in deep and intermediate water-layers. Moreover, a 



specimen taken near Nias Island in the Indian Ocean was referred to this species by Vanhoffen (1911, 



p. 213, text-fig. 9). 



Heterotiara minor Vanhoffen 19 11 



191 1 Heterotiara minor Vanhoffen, p. 212. PI. 22, fig. 5. Text-fig. 8. 



1916 Heterotiara minor Browne, p. 183. 



1919 Heterotiara minor Bigelow, p. 287. PI. 39, fig. 9; PI 40, figs. 2-4. 



1928 Heterotiara minor Kramp, p. 58. Text-figs. 27-30. 



1953 Heterotiara minor Kramp, p. 268. 



Occurrence: St. 1371. 19. v. 34. 36° 42' 24" S, 36° 04' 24" E. Net: N 100 B 146-0 m. 2 specimens. 



St. 1374. 24. V. 34. 31° 46' 36" S, 29° 46' 18" E. Net: TYFB 230-0 m. 2 specimens. 



The localities are off the south-east coast of Africa. 



The specimens have the following numbers of tentacles : 



These specimens must therefore be referred to H. minor and not to H. anonyma, which is a larger 

 medusa with a smaller number of tentacles. 



Distribution. Widely distributed in the Indian Ocean and the tropical West Pacific. Not previously 

 found farther west than the Chagos Islands, about 72° E. 



Family RusSELLlD.\E fam.nov. 

 Anthomedusae with unbranched oral tentacles without terminal cluster of nematocysts, situated 

 above the mouth opening; mouth with simple perradial lips; with groups of hollow, marginal ten- 

 tacles without basal swellings, partly sunk into narrow fissures of the umbrella margin ; with adaxial 



ocelli. 



Russellia gen.n. 



Russellidae with an apical projection; wv\h cruciform stomach mounted upon a peduncle; with four 

 pointed oral tentacles; with eight smooth, adradial gonads; with four simple radial canals; with eight 

 groups of marginal tentacles (each group with one large and two small tentacles, the basal part of the 

 large tentacles sunk into a deep furrow of the umbrella margin) ; with an adaxial ocellus at the base 

 of the free portion of each large tentacle. 



Type-species: Russellia mirabilis gen.n., sp.n. 

 The species, which will be described below, is very peculiar and cannot be included in any of the 

 known families of Anthomedusae. It resembles the Calycopsidae in the structure of the basal part 

 of the marginal tentacles, which are of the same type as in Calycopsis and Heterotiara. In the 

 cross-shaped base of the stomach and the quadrangular mouth it is likewise in accordance with the 

 Calycopsidae and the Pandeidae, and I think that it must be placed in the neighbourhood of these 



