146 Mr. J. W. Fewkes on Angclopsls. 



subject. When this gentleman was last at the Museum I 

 asked him how it was that he had obtained no male speci- 

 mens of F. Iltldehrandti', and very much to my surprise and 

 pleasure found (though he had forgotten to mention it before) 

 that he had not only arrived at the same conclusion as my- 

 self, but had solved the riddle long before on Kilima-njaro, 

 and discovered that F. Alfumt is the male and K Hildebrandii 

 the female of one and the same species. 



Mr. Hunter had been considerably exercised in his mind by 

 on the one hand never being able to obtain the male of F. 

 Hildehrandti, while on the other hand all the specimens he 

 got of F. Altumi proved invariably to be males. As these 

 two birds were always obtained in company by his collectors, 

 the truth gradually dawned on him and was subsequently 

 proved beyond a doubt by the dissection of a large number of 

 specimens obtained for food. 



On comparing the two birds the different points of resem- 

 blance are at once seen, viz. the plumage of the upper surface 

 and under tail-coverts and the colour of the bill and legs, 

 which are all practically the same in both ; but, so far as I 

 know at present, the extraordinary difference in the colour of 

 the under surface in the sexes is unique in this genus. A still 

 more extraordinary thing is that in the two apparently 

 closely allied forms, F. icterorJtyncJius and F. natalensisj 

 the females resemble the males but are without spurs. 



The name FrancoUnus ITildehrandti, Cabanis, must there- 

 fore be used in future to designate this species. 



XVI. — On Angelopsis, and its Relationship to certain 

 Siplionophora taken by the '■Challenger.'' By J. Walter 



FEWKE&. 



[Plate Vn. figs. 1-3.] 



One of the most interesting genera of Medusa3 discovered in 

 the depths of the Gulf-stream by the United States Fish- 

 Commission steamer ' Albatross ' is a new Phy soph ore which 

 was described a few years ago (1884) under the name of 

 Angelopsis in my paper on the Medusse of this region. 



This genus is remarkable for its large float and the reduc- 

 tion in size and increase in thickness of the walls of the 

 polyp-stem, which has the form of a semicartilaginous expan- 

 sion with a cavity, and with its external walls covered with 



