NARCOMEDUSAE 75 



Numerous medusoid larvae were found in the canals in a specimen, 35 mm. wide, from St. 701. 

 The sample from St. 282 contained three fragments which may possibly have belonged to one 

 specimen of P. clara, about 15 mm. in diameter. There are altogether 48 tentacles, many of them 

 small, partly very small, and the lappets are of very different width, most of them more than twice 

 as long as broad and usually with two very long otoporpae. The tentacles and lappets are so densely 

 crowded that the circumference of the medusa may very well have had the great number of 48, and 

 I am inclined to think that the three fragments may really belong to one specimen. 



Four very small specimens, 3-4 mm. in diameter, were found at Stations 708 (near the coast of 

 Brazil) and 1585 (East Africa). They have a thick and highly vaulted jelly, and also the marginal 

 lappets are rather thick, with fairly broad canals (text-fig. 13). The lappets are as long as broad or 

 somewhat longer, each of them with three very long otoporpae. In one of the specimens, 4 mm. wide 

 with 10 tentacles, the otoporpae are at least twice as long as the lappets; in the three other specimens, 

 which are 3-3-5 mm. in diameter, with 7, 8 and 9 tentacles respectively, the median otoporpa of each 

 lappet reaches up to the very apex of the umbrella, the two others are about half as long or somewhat 

 more, ending blindly, not connected with the median one. 



p.c. 

 s.p. 



Text-fig. 13. Pegantha clara. A marginal lappet and two tentacles of a young specimen, diameter 3-5 mm., from St. 708, 

 ^.p. = stomach pouch, /).c. = peripheral canal, w./. = margin of lappet, ii. = velum. 



The collection contains 32 specimens, 29 of which could be measured, varying in diameter between 

 3 mm. and 50 mm. The number of tentacles in proportion to diameter of umbrella is summarized in 



the following table : 



No. of tentacles 



Average 



diameter 



(mm.) 



3-5 



lO-O 

 12-7 



17-5 

 23-0 



30-2 

 45-0 



Total 



Width of 

 variation 



7-10 

 14-18 

 20-23 

 18-23 



21 

 22-25 

 28-40 



7-40 



Average 

 number 



8-S 

 15-7 



21-6 

 20-8 

 21'0 

 237 



33-2 



20-8 



No. of 

 specimens 

 examined 



4 

 3 



7 

 6 



I 



4 



4 



29 



The four largest specimens had the following numbers: 



Diam. (mm.) 

 No. of tentacles 



42 

 40 



43 



33 



45 

 32 



5° 

 28 



10-2 



