[21] 



MEDUSAE EROM THE GULE STREAM. 



533 



tween those which pass through the middle line of each marginal lap- 

 pet. The best preserved of all the specimens is from Station 2717. 

 In this specimen the stumps of certain of the tentacles are present. 

 They lie, as stated above, on the notches between the marginal lappets. 

 The form of the abaxial rim of the marginal lappets in this specimen 

 is bifid, recalling the appearance in the marginal lappets of Atolla. 

 The exumbral surface of the marginal lappet is rough, with slight pro- 

 jections. Its rim is thin, the attachment and body of the lappet thick 

 and gelatinous. The whole marginal lappet recalls those of the species 

 verrillii of the genus Atolla. No sense bodies were seen in the alcoholic 

 material at my control. 



It is desirable that the live medusa of Ephyroidcs be studied, as the 

 features presented by the alcoholic material are of great morphological 

 interest. It has not seemed to me best to sny anything about these 

 questions until more is known of the anatomy of the extraordinary 

 genus. 



Family CYANEIDiE, L. Agassiz. 



Cyanea, sp. 



A specimen of Cyanea from the Gulf Stream differs in certain respects 

 from the Cyanea arctica, Per. et L., of the New England coast. It also 

 differs from other species of this genus which have been described. 

 With the imperfect knowledge derived from a single specimen, I hesi- 

 tate to introduce a new name into the nomenclature of this genus, 

 although there is little doubt that the specimen referred to is not the 

 common C. arctica.* 



A much larger specimen than either of those mentioned above was 

 collected in 1879, Station 37S, No. 5121, off Cape Cod. This specimen 

 resembles more closely than the others the common C. arctica, Per. et 

 Les., but the mouth appendage and tentacles are missing. The forms 

 of the marginal lappets are like those of C. arctica. 



* One of the main differences between this Cyanea and C. arctica is found in the 

 incisions in the marginal lappets. There are in the unknown Cyanea eight deep 

 ocular incisions, eight shallower tentacular incisions, and the margin of the bell be- 

 tween each occular and tentacular incision is again incised. There are therefore 32 

 marginal lappets. 



