hy Hydroid Polypes belonging to different Genera. 461 



Ilfracombe specimen of the Stauridia-zooid) with Prof. Allman's 

 account of the Medusoid of his Coryne eximia will at once show 

 the perfect identity of the two forms. 



Mr. George Hodge has kindly permitted me to make use of a 

 beautiful drawing of the latter from his own pencil (Plate IX. 

 fig. 1), and I have placed beside it a sketch of the former by 

 myself (fig. 2). The diversity in shape is probably due to a 

 difierence in age. The specimen from which my figure was 

 taken was in an immature state*. 



The Sarsia turricula of Prof. M'Crady^s paper on " the Gym- 

 nophthalmata of Charleston Harbour '^ (Proc. of EUiott Soc. of 

 Nat. Hist. vol. i. p. 138, pi. 8. figs. 6-8) appears to be identical 

 with the form which I have just described. His account, how- 

 ever, of the Coryne from which he supposed it to proceed does 

 not enable me to determine the species with certainty. 



Throughout this paper I have employed the term Gonozooid 

 to designate the free reproductive body, instead of the more 

 usual term Medusoid. The latter seems to me objectionable, as 

 tending to perpetuate a false conception of the nature of the 

 sexual zooid. It helps to keep up the idea of a distinct and 

 absolute individuality in the latter, and to conceal its real signifi- 

 cance, as the mere equivalent of the flower-bud in the plant. 

 In the life- series of the Hydroid, the polype is the alimentary 

 zooid, and the sexual element or term may be conveniently and 

 correctly designated the gonozooid, 



EXPLANATION OF PLATE IX. 



Fiy. 1. Gonozooid of Coryne eximia, from a drawing by Mr. G. Hodge. 



Fig. 2. Gonozooid of Stauridia producta. 



Fig. 3. Laomedea frag His, n. sp. ; natural size and magnified. 



Fig. 4. Atractylis margarica, n. sp., with its gonophore ; 4 a, one of the 

 tentacular clusters of thread-cells ; x, a single thread-cell from 

 the above ; 4 b, the lid of the gonophore ; 4 c, one of the branched 

 ])rocesses ; 4 c?, an ovum j 4 e, a portion of the creeping stem, with 

 cells. 



BIBLIOGRAPHICAL NOTICE. 



Memoir of the Rev. John Stevens Henslow, M.A. By the Rev. 



Leonard Jenyns, M.A. London: Van Voorst, 186*2. 12mo. 

 Perhaps we are guilty of neglect in not having noticed the Life of 

 Henslow sooner. Our readers must take this statement as an apo- 

 logy, if one is necessary, the fact being that no review was required 

 to direct the attention of our readers to this work. All of them 

 knew the lamented Professor by reputation, many personally ; and 



* There arc other slight differences between the figures ; but a comparison 

 of the detailed descriptions of the two forms shows that those belong to the 

 drawings, and not to the objects themselves. 



