MAYER: MEDUS/E FROM THE TORTUGAS, FLORIDA. 29 



Dipurena picta, nov. sp. 



Figs. 45, 46, Plate 18. 



Specific Characters. — The bell is cylindrical in shape and 3 mm. in height. 

 The bell walls are very thick and of a tough gelatinous consistency. There 

 are 4 slender tentacles that are not quite as long as the bell height. These 

 tentacles bear from 3-5 bulb-shaped nematocystic swellings near their distal 

 ends (see Figure 46). The basal bulbs of the tentacles are large, and each 

 ong bears a dark purple ocellus. There are 4 straight radial tubes and a 

 narrow circular tube. The velum is not very well developed. The proboscis 

 is about 5 mm. in length and exhibits two distinct annular swellings that 

 mark the places where the gonads are situated. The entoderm of the probos- 

 cis and basal bulbs of the tentacles is of a beautiful custard -yellow. The 

 entoderm of the nettle knobs of the tentacles is port-wine-colored. 



Two specimens were found at the Tortugas, Florida, during the first week in 

 August, 1898. 



This species is closely allied to Dipurena dolichogaster, of the Mediterranean 

 (see Haeckel, Syst. der Medusen, 1879, p. 25, Taf. II., Figures 1-7). It differs, 

 however, from the Mediterranean form in that the bell is much thicker and 

 more nearly cylindrical in shape, and there are fewer nematocyst-bearing bulbs 

 upon the tentacles. 



STEENSTRUPIA, Forbes, 1848. 

 Steenstrupia gracilis, Brooks. 



Figs. 36, 37, Plate 16. 



Steenstrupia gracilis, Brooks, W. K., 1882, Studies Biol. Lab. Johns Hopkins 

 Univ., Vol. II. p. 144. 



Specific Characters. — The bell is 4.5 mm. in height, and is surmounted by 

 a slender apical projection fully 2 mm. in length. There are 2 rudimentary 

 tentacle bulbs, one short, stiff tentacle, and one long tentacle which is ringed 

 with a number of annular swellings. The velum is well developed. There are 

 4 slender radial canals and a narrow ring-canal. A long slender canal runs 

 up from the proboscis into the apical projection of the bell. In mature speci- 

 mens (Figure 36) the proboscis extends a short distance beyond the velar 

 opening. The proboscis is cone-shaped, and the mouth is a simple round 

 opening without oral lappets. The entoderm of the proboscis is intense 

 yellow-green and rose-color. The entoderm of the tentacles is either yellow- 

 green or rose-colored. Found at the Tortugas, Florida, and on the North 

 Carolina coast; in July and August. 



