114 



TIMA FORMOSA. 



both sides of the chymiferous tubes (Fig, 167) ; the tentacles have a 

 Fi^. 167. very prominent pouch, strongly compressed laterally, at the 

 point of junction with the marginal tubes ; between the 

 larger principal tentacles (t, Fig. 168) we find a number of 

 small pouclies, rudimentary tentacles (f, Fig. 168), which 

 are never developed fully, yet appear to be included in the 

 regular cycle of tentacles, to judge from the number we 

 find at different stages of growth ; between the smaller 

 tentacles we find marginal capsules (c, Fig. 168), with four 

 to five granules arranged near the periphery ; the circular 

 tube is large and very prominent ; the spherosome is per- 

 fectly colorless, but the ovaries, as well as the base of the 

 tentacles, are of a beautiful milky white, which makes these Jelly- 

 fishes a very prominent object in the water ; they do not come near 

 Pi„ 168. the surface, but remain usually 



four or five feet below ; they 

 are found during the whole year, 

 adult specimens having been taken 

 in June, October, December, and 

 March. The young Medusa (Fig. 169) differs widely from the adult ; 

 there are no ovaries in specimens measuring more than an inch in 

 diameter ; the chymiferous tubes extend along the short proboscis 

 {t, Fig. 170), opening into a digestive cavity, d, which terminates 

 with four rather simple lips, more like the actinostome of a Lafoea ; 

 there are but three large marginal tentacles between adjoining chy- 

 miferous tubes, and no signs of any further cycles of tentacles in 



Fig. 169. Fig. 170. 



the specimen figured here ; marginal capsules were likewise not yet 

 developed. The young Medusa of Tima is another case to be added 

 to Melicertum, Lafoea, and Atractylis, where there are no marginal 



Fig. 16 7 Portion of the ovary, f, f, lobes running on either side of the chymiferous tubes. 



Fig. 168. A magnified portion of the circular tube. ?, t, principal tentacles ; t', rudimentary 

 tentacles ; c, marginal capsules 



Fig. 169. Young Tima formosa, natural size. 



Fig. 170. Digestive cavity of Fig. 169. t, termination of chymiferous tubes; d, digestive 

 cavity. 



