76 DISCOVERY REPORTS 



The figures show a rapid increase in the number of tentacles and marginal lappets during the 

 youngest stages from 3 mm. to about 1 1 mm. or 12 mm. diameter; during the next period the number 

 is fairly constant, but the differences in size between the tentacles and lappets of different age are 

 gradually effaced, and if the growth is continued beyond a diameter of about 30 mm. or 35 mm. a 

 further addition of tentacles and lappets takes place. The result is that in almost all stages of develop- 

 ment, lappets of different width and tentacles of different length are present, which is a very charac- 

 teristic feature of this species. Large and small tentacles may sometimes be almost regularly alternate, 

 but as a rule the sequence is more or less irregular (see Kramp 1947, p. 33). 



In 1918 H. B. Bigelow realized that the East Pacific species, Pegantha smaragdina, described by 

 him in 1909 was identical with the Atlantic species, P. clara, described a few months earlier by R. P. 

 Bigelow. Solmoneta lunulata Haeckel from the Canary Islands may possibly be identical with P. clara, 

 but, as mentioned on p. 66, this identification seems to me too doubtful to be adopted. I propose, 

 therefore, that the name Solmoneta lunulata be regarded as obsolete. According to Bigelow (1938) 

 the specimens identified as Polycolpaforskali by Vanhoffen (1908, 1912a and 19126) belong to P. clara. 



Distribution. Pacific: off the coast of South America from the Gulf of Panama to about 25° S; 

 between the Hawaiian Islands and the Caroline Islands. Widely distributed in the Atlantic between 

 about 40^ S and 50° N. Now for the first time recorded from the Indian Ocean. 



Pegantha rubiginosa (Kolliker 1853) 

 (PI. VI, fig. 4) 



1853 Eurystoma rubiginosum Kolliker, in Gegenbaur, Kolliker & Miiller, p. 322. 

 1861 Aegineta gemmifera Keferstein & Ehlers, p. 93. PI. 14, figs. lo-ii. 



1879 Cunina rhododactvla + rubiginosa Haeckel, p. 321. 



1 886 Cunina rhododactyla MetschnikofF, p. 251. 



1910 Cunina prolifera Mayer, p. 480. 



1924 Cunina rubiginosa Kramp, p. 37. 



1925 a Cunina prolifera Ranson, p. 91. 

 1936 Cunina rubiginosa (pars) Thiel, p. 77. 

 1936 Cunina rubiginosa Ranson, p. 199. 



1936 Cunina lativentris Damas, pp. I ijj-gj. Figs. Larvae. 

 1940 Cunina prolifera Bigelow, p. 303. 

 1 95 1 J Cunina rubiginosa Vannucci, pp. 106, 112, 113. 

 1955 Pegantha rubiginosa Kramp, p. 280. 



1854 non Cunina prolifera Gegenbaur. 



The specific name Cunina rubiginosa was maintained by me in 1924. Bigelow (1940) referred this 



species to the Solmaridae, genus Polycolpa ' if that genus be recognized '. I have recently referred it to 



the genus Pegantha. Thiel (1936) has erroneously identified it with almost all the species of Cunina. 



Occurrence: St. 697. 12. v. 31. 09° 15' 15" N, 30° 01' 45" W. Net: TYFB 460-0 m. i specimen. South-west 

 of the Cape Verde Islands. 



The specimen is well preserved, 7 mm. in diameter, with 13 tentacles. The jelly is thick and highly 

 vaulted. Each of the marginal lappets, which are almost semicircular, has two or four otoporpae; 

 when there are four, two of them are very long, longer than the lappet, flanked by two short ones. 

 The peripheral canals are narrow, of equal width throughout. Gonads are not developed. 



The narrow peripheral canals and the evenly rounded outline of the marginal lappets are charac- 

 teristic of this species. It is also characteristic that as a rule there are two long and two short otoporpae 

 on each lappet; an odd number is rarely found (see PI. VI, fig. 4). 



Distribution. Common in the Mediterranean. First recorded from the Atlantic by Ranson (19250) 



