50 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



des Nat. de St. Petersbourg, T. XXIX. p. 155, Plate I. Figure 5). The 

 velum is very well developed. There are 4 straight, narrow, radial tubes, upon 

 the upper regions of which the gonads are situated. The proboscis is wide 

 and flask-shaped, and the mouth is provided with four prominent, crenulated 

 lips. The color of the entoderm of the proboscis and tentacle bulbs is ochre- 

 yellow, or reddish-brown. Several specimens were fovmd at the Tortugas, 

 Florida, late in June and early in July, 1898, and in June, 1899. 



It is evident that this species has been noticed by Fewkes, 1882, under the 

 name of " Tiaropsis diademata." The species is quite distinct from T. diade- 

 mata, however, for it is smaller, possesses fewer tentacles, and is of a different 

 color; moreover the bell of the young medusa is very much flatter than is that 

 of T. diademata in a corresponding stage of development. The Tortugas form 

 is closely allied to T. rosese of the Fiji Islands ; and it also bears some resem- 

 blance to T. mediterranea, Metschnikoff (1886; Arbeit Zool. Inst. Wien. Bd. 

 VI. p. 239, Taf. I. Figs. 6-8). 



OCEANIA, Peron and Lesuedr, 1809. 

 Oceania McCradyi. 



Figs. 56-59, Plate 31. 



Epenthesis McCradyi, Brooks, W. K., 1888, Studies Johns Hopkins Univ. Biol. 

 Lab., Vol. IV. pp. 147-1(32, Pis. 13-15. 



We present some colored figures of this remarkable medusa which develops 

 hydroid-blastostyles upon its gonads. It has been found by Brooks among 

 the Bahama Islands, and by Bigelow off the Florida Coast. We found it at 

 the Tortugas, Florida, in July, 1898. Brooks, 1888, claims to have found the 

 hydroid of this species. 



Oceania magnifica, nov. sp. 



Figs. 18, 18a, Plate 9. 



Specific Characters. — The bell is thin and flat and 14 mm. in diameter. 

 There are 32 slender tentacles of short length. There are 64 otocysts, 2 

 between each successive pair of tentacles. Each otocyst contains a single, 

 spherical otolith. The velum is small. There are 4 straight, narrow, radial 

 tubes. The gonads are developed upon the distal portion of these tubes 

 near to the circular canal. The proboscis is short, and there are 4 sharply 

 curled lips. The color of the entoderm of the proboscis and tentacle bulbs is 

 intense green, while the ectoderm of the proboscis and of the genital organs is 

 usually rich purple. 



Several specimens were found at the Tortugas, Florida, in June, 1897, and 

 a large number during the summers of 1898 and 1899. 



