OF THE HYDROMEDUS.E. 397 



were all of equal length, and were arranged as in this diagram, where i? stands for a 

 radial tentacle and O for a marginal vesicle. 



ETTTKTTTK 

 O O 



If the middle tentacle of each quadrant is the youngest one, the stage which is shown 

 in PI. 40 must be preceded by a stage with only twelve tentacles. This plate, which is 

 a photographic copy of a pen sketch made from the living medusa, is the only figure 

 which has ever been published of this beautiful species. 



The tentacles of the adult have well-marked bulbs; their long, slender shafts are 

 usually extended to four or five times the diameter of the bell, and are never completely 

 retracted, but when shortened they are thrown into zigzag folds. 



On Aug. 7, 1880, I obtained a single specimen of a Eutima with a thick, flattened 

 umbrella, and four long, slender tentacles. It is shown in PI. 39, fig. 1. It was 8 mm. 

 in diameter and although it differs in many respects from the adult Eutima variab- 

 ilis, it shows so many points of resemblance that it is, in all probability, the four-tenta- 

 cled stage of this species. The bell is very flat, about four times as wide ashigh, thick 

 in the middle, and gradually becoming thin at the edges. The peduncle is longer than 

 the diameter of the bell, while the stomach is very short and only a little longer than 

 wide. Veil very narrow. The four tentacles have bulbs, which are covered by hood- 

 like outgrowths from the umbrella, and their long, slender shafts are capable of very 

 limited contraction; and, when extended to four times the diameter of the bell, are 

 thrown into zigzag folds. Tbe four ovaries are long, narrow and continuous, and they 

 run from near the circular tube up into base of peduncle and down this for a short dis- 

 tance. There are no accessory tentacles on the tentacular bulbs, but between each pair of 

 tentacles, there are nine or ten marginal enlargements, some of which have cirri. The 

 lips are simple folds, and there are eight marginal vesicles, each with from three to nine 

 otoliths. 



It is possible that Agassiz's Eutima, pyramidalis may be the young of this species, al- 

 though he states that the bell is hemispherical, which is certainly not the case with any 

 of the specimens which I have seen. 



A. Agassiz's Eutima limpida (2) and Fewkes's Eutima gracilis (20) are, beyond ques- 

 tion, distinct from the species found at Beaufort, so that we have, on our coast, four 

 species of the genus. 



Eutima mira, with a hemispherical bell, and a very long proboscis, with folded lips, 

 and with four tentacles; Eutima variabilis with sixteen long tentacles, a short proboscis 

 and a flattened bell; Eutima limpida with short tentacles without bulbs, and with sim- 

 ple lips ; Eutima gracilis with a flattened bell, four tentacles with bulbs, large cirri, acces- 

 sory tentacles and a globular stomach. The latter species, which is so far known from 

 only a single specimen, is very similar to Keferstein's SijrfionorJiynchus insignis (36) with 

 which it may prove to be identical. 



In June, 1870, I obtained at Beaufort several young specimens, about 5 mm. in 

 diameter, of a young Eutima which agrees with A. Agassiz's description of Eutima 



