[3] MEDUSA FROM THE GULF STREAM. 515 



specimens have the body complete, but from the fragments of both 

 several common details can be made out. No. 1 is destitute of a float; 

 No. 2 has the float well developed. 



Pterophysa grandis, Fewkes. 



[No. 1.] 



The stem of this specimen is approximately 20 feet in length in 

 alcohol. It is ribbon-shaped, about 3 mm broad. Not twisted. Color 

 in alcohol, white. No float present, but this structure is ruptured from 

 its connection. 



The terminal polypite is 40 mm in length, elongated, finger-shaped, 

 with dark color near its distal end. On the proximal third of its length 

 it bears two well-marked lateral bauds or ptera, which are placed op- 

 posite each other on 1 he polypite. The terminal polypite arises from 

 a point on the axis where the stem is somewhat thickened. The surface 

 of the thickened stem is nodose, probably from contraction. A short 

 fragment of a tentacle springs from its base of attachment to the stem. 

 The stem narrows above the nodose enlargement, becomes again thick- 

 ened as it recedes from the polypite, and then diminishes in size to the 

 flat, ribbon-like shape of the stem. 



The penultimate polypite is elongated, finger-like, 50 mm in length, 

 enlarged into a knob at the distal or oral end. In the proximal region, 

 on each side, there are two marked ptera. The penultimate polypite 

 is similar to the terminal, and arises from the stem by a long thread 

 similar to but smaller than the peduncle. The filamentary union of the 

 polypite to the stem arises from a tangled cluster of thread-like bodies 

 on the stem. These bodies possibly correspond to the immature lateral 

 branches of the tentacle. 



Between the region of the stem from which the tangled lateral bodies 

 arise and the other (opposite) end of the stem there are several poly- 

 pites, all of which have similar filamentous attachments to the flat (in 

 alcohol) axis, as the ultimate and penultimate. Many small clusters of 

 sexual bodies, confined as a general thing to the flat axis, are noticed. 

 These bodies have, like the sexual glands of Bhizophysa, the form of 

 botryoidal clusters. 



[No. 2.] 



In this specimen a float and the proximal end of the axis are well 

 preserved. The whole axis is 1.9 m long. 



The float is large, 15" lm in length, and appears to be carried upright, 

 as in B. eysenhardtii, Geg. It has an apical opening. This opening is 

 surrounded by a zone of reddish pigment. From the pneumatophore 

 hang digitiform appendages into the cavity of the pneumatocyst, as 

 in the genus Bhizophysa. The walls of both pneumatocyst and pneu- 

 matophore are thiu. At the base of the pneumatocyst the stem becomes 



