ANTHOMEDUSAE 25 



thin, hollow, up to 5 mm. long, but apparently all of them have lost their terminal portions; it cannot 

 be stated, therefore, whether they have had a terminal knob of nematocysts. Immediately below the 

 point of issue of the filiform tentacles is a red ocellus. 



At the base of each of the eight large tentacle roots is a pair of similar tentacular structures, much 

 smaller and diverging on both sides of the large one (PI. IV, figs. 4-6). Apparently, therefore, this 

 medusa has not merely eight single tentacles, but eight clusters, each consisting of one large and two 

 small tentacles. 



The four specimens have the following dimensions : 



St. WS 300, diam. 7-5 mm., height 13 mm., male. 



St. 584, diam. 7-5 mm., height 12 mm., female. 



St. 587, diam. 9 mm., height 14 mm., female (the type specimen). 



St. 1871, diam. 9 mm., height 15 mm., male. 



The localities where this interesting species was collected are all within the antarctic region. Three 

 of the hauls were made in the upper layers, but at St. 1871, east of South Shetland Islands, the medusa 

 was apparently taken in deep water. If the bathymetric details are correct, this may perhaps be 

 explained by the downward movement of the antarctic surface water in this region. 



(Since the above was written, I have seen some specimens of the same species collected by the 

 ' Dana ' in West-Indian waters.) 



Family Tiarannidae 

 Tiaranna rotunda (Quoy & Gaimard 1824) 



(Text-fig. 5) 

 1910 Tiara rotunda Mayer, p. 124. 



1913 Tiaranna rotunda Hartlaub, p. 266. Text-figs. 218, 219. 

 1920 Tiaranna rotunda Kramp, p. 6. PI. i, figs. 2-4. 



Occurrence: St. 71. 30. v. 26. 43° 20' S, 46° 02' W. Off Patagonia. Net: N 70 V, 1000-750 m. i specimen. 

 St. 276. 5. viii. 27. 05° 54' S, 11° 19' E. Gulf of Guinea. Net: TYF i5o(-o) m. Fragments of two specimens. 

 St. 1702. 17. iii. 36. 64° 20' 06" S, 139° 54' E. Off Wilkes Land, Antarctica. Net: TYFB 2000-1250 m. i specimen. 

 St. 1723. 28. iii. 36. 60° 06' 42" S, 102° 48' 36" E. Off Queen Mary Land, Antarctica. Net: TYFB 800-500 m. 



Fragments of two specimens. 

 All the specimens are in a very poor condition, but I am so well acquainted with this species that the 

 identification is beyond doubt. 



Distribution. This species belongs to the deep and intermediate layers; it has been recorded from 

 several localities in the North Atlantic and the western part of the Mediterranean. It might be ex- 

 pected to have a wider distribution, and the above records show that this is so, the area being extended 

 to include the South Atlantic and the antarctic seas to the south of Australia. 



Chromatonema rubrum Fewkes 1882 

 (Text-fig. 5) 



1882 Chromatonema rubrum Fewkes, p. 305. PI. i, fig. 41. 



1910 Thaumantias rubrum Mayer, p. 199. 



1919 Chromatonema rubrum Kramp, p. 7. PI. i, figs. 1-8. Text-figs. 3, 4ff. 



1947 Chromatonema rubrun Kramp, p. 52. Pi. 6, fig. 7 (coloured drawing from life). 



Occurrence: St loi. 15. x. 26. 33° 50' S, 16° 04' E to 34° 13' S, 15° 49' E. West of Cape of Good Hope. 



Net: N 450 850-950 m. i specimen. 

 St. 1719. 25. iii. 36. 64° 15' 30" S, 104° 03' 24" E. Off Knox Land, Antarctica. Net: TYFB 950-55° m. 



I specimen. 



D .X.XI.\ 



