SCYPHOMEDUSAE 



387 



St. 281. i2.viii. 27. 00° 46' S, 5° 49' 15" E, Gulf of Guinea. 70 cm. tow-net, o m. 



Four specimens, one without mouth arms and manubrium, 19, 20, 27, 31 mm. diam., 14, 11, 7, 

 18 mm. high; two flat, two vaulted; warts on the flat ones flat, rounded and even, on the highly 

 vaulted specimens high, oval and with ridge ; gonads on the largest specimens well developed, dark 

 pinkish. 



St. 282. 12. viii. 27. 1° 11' S, 5° 38' E, Gulf of Guinea. Young fish trawl, 300 (-0) m. 



Two fine specimens of 27 and 30 mm. diam., 16 and 17 mm. high; nettle-warts high, oblong, 

 covering centre and margin {noctiluca type), gonads well developed, manubrium relatively long. 



St. 285. 16. viii. 27. 2' 43' 30" S, 00° 56' 30" W, Gulf of Guinea. 4I m. tow-net, 125-175 (-0) m. 

 Four specimens, deformed, damaged on mouth arms, 13, 17, 24, 28 mm. diam., height.?, warts 

 round to oval, gonads developed on the two largest. 



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



One specimen, badly damaged, 36 mm. in diam.; flat, umbrella only, without mouth arms; warts 

 small, oblong, with ridge. 



29. xi. 26. 25° 47' S, 17° 48' W, north of Tristan d'Acunha. Hand-net, o m. 



One specimen, in fair condition, 35 mm. diam., 17 mm. high, marginal zone smooth ("cya«e//a" 

 type), gonads feebly developed. 



St. i68. 25. xi. 27. 60° 58' S, 48° 05' W, between South Orkneys and Clarence Island. Young fish 

 trawl, 100-150 (-0) m. 



Eight young specimens, well preserved, two damaged on mouth arms ; bell flat, transparent ; small 

 round oval warts all over the surface of the exumbrella {noctiluca type). Gonads relatively well 

 developed, yellowish. Surface temperature — 0-20° C. 



Table X 



Showing measiiremenis in mm. of eight specimens of 

 Pelagia noctiluca, Forskdl {from St. 168) 



About twenty different species or varieties of the genus Pelagia have hitherto been 

 described. All characters, however, to which previous students of the group devoted 

 attention, viz. proportionate dimensions of the bell, length of manubrium and mouth 

 arms, outline of the marginal lappets, shape and arrangement of exumbrellar nettle- 

 warts, etc., proved not to be reliable for discrimination of the species, altering with age 

 or being subject to great variation. According to former statements and the result of 

 extensive studies by Vanhoeffen, Mayer, Broch, Kramp, Bigelow and the author, one 



8-2 



