2O HARGITT. 



and the general aspect of tentacles, the first thought was of its 

 possibility as the very young of Dipnrcna. A careful study of 

 the bell form, as well as that of the manubrium, and the remark- 

 able development of the tentacular knobs, all are fundamentally 

 unlike Dipurena. And while apparently a young specimen it 

 may be doubted whether in all essential respects it is not fairly 

 adult in morphological aspects. I am therefore disposed to re- 

 gard it as entitled to both generic and specific distinctness, and 

 propose for it, at least provisionally, the name Dipurella davata. 



Cruises were made off Nantucket southward on August 13, 

 and off Chatham at "crab ledge" August 19 secured a medusoid 

 fauna in many regards different from that of the former. 

 Oceania and Obelia were found in about the same numbers as 

 before, but there was a noticeable absence of all those distinc- 

 tively tropical in their ranges. 



On the other hand here were the outliers of an arctic fauna as 

 indicated in such forms as Pleurobrachia and Bcroc among 

 Ctenophores, Tealia crassicornis, Bunodes Stella, among actin- 

 ians, Solaster among starfishes, etc., while of medusae were found 

 Hybocodon, Corymorpha and Trachynema chiefly. 



The occurrence of Hybocodon prolifer at this season was quite 

 a surprise, as so far as I am aware its occurrence has been re- 

 corded chiefly, if not wholly, during the very early spring. It 

 was in perfect sexual maturity and also budding medusae prolif- 

 erously from the base of the tentacle. An interesting condition 

 of these specimens was the absence of the bright orange-red 

 coloration which is so marked a feature of the early spring forms, 

 and with it also the absence of the exumbrellar bands of nema- 

 tocysts. But for the fact that I have often noted the gradual 

 decline of this feature in late spring specimens I should have felt 

 disposed to consider the specimens taken on this cruise to be of 

 a distinct species. It is not altogether improbable that similar 

 features in the seasonal variation of other medusae may have 

 been the occasion of thus specifically differentiating one and the 

 same organism. 



Here also I took for the first time during the summer the 

 medusa of Corymorpha pcndula. In general aspects it is much 

 like Hybocodon and I am disposed to favor Haeckel's assignment 



