lnhniijin') ('> til, Fitiiiilil «'/' Si|ll;mii)iiliin 

 rahly laru^cr, viz. 1 



■M\) 



X, 



wrn- «-ojisi(lt'rahly larij:cr, viz. \^f, incli l"ii;j; (= 2S milliins.). 

 Althou^'li thev rotainod tlu' noculiar arniaturc of the head, the 

 torin of the fxxly and tins had greatly ehanged, resembling 

 now that of a Cl'iotodon or I lolacanthiis \ so that Mr. Day felt 

 convineed that Tholirhthiix wa.s the young of a genus of 

 Stjuuiui/)i/iii(s (Proe. Znol. Soc. 1870, p. 087). 



It is uiv ohjcet in tiie ])resent notiee to show that this sup- 

 jiosition of Mr. Day is quite eorreet. Unfortunately the spe- 

 eiinen deposited hv Mr. Day in the British Museum has been 

 mislai<l, so that l eann(^t avail myself of it for comparison 

 with the specimens which I intend to describe here. 



1. 1 have examined two specimens, 30 millims. long, of 

 ChirtoJon citrinclhis — one, in the British Museum, from the 

 b\'ejee Islands, and the other recently <d)tained from Ilr. C. 

 Gocletfroy. These examples show all the characters of 

 that species : not only are the tins as 

 well developed as in the mature form, 

 but also the black ocular band and 

 the marginal anal stripe are present. 

 Yet these specimens still retain the 

 seapulary and humeral laminK, and 

 the prKopercular process projects to 

 the root of the venti-al. Compara- 

 tively, these lamina? appear to be smaller than in JlioUchthyes of 

 younger age ; but this is merely in consequence of the greater 

 development of the body in the more advanced stage, its 

 groAvth being much more ra])id than that of the head. 



2. Xot only C/ia'todou, but also other 8quami])innate ge- 

 nera appear to have a T/toIicht/it/s-atage. With the speci- 

 men of Ch. citrinellus mentioned above, Hr. Godeffroy sent 

 another fish, represented in the accompanying woodcut, and 

 now in the British Museum. The 



plates on the shoulder and prjBoper- 

 eulura are as in the young of Choe- 

 todon ; but the fisli is distinguished 

 besides by a remarkably long and 

 curved horn above each orbit ; a 

 deep groove rmis along the lower 

 side of the horn. The numbers of 

 the fin-rays are, D. i^ and A. .jj. 

 There are betsveen 50 and 60 trans- 

 verse series of scales on the body. 

 Now,' although it is possible that the 



horn above the orbit is also an excrescence lost in the more 

 mature state of the individual, it yet reminds us of those 

 species of Ileniochus which are provided with more or less 



