122 Mr. C. T. Regan on the 



Nomeus Gronovii, Gmelin. 

 Full synonymy given by Jordan and Evermann, Fish. N. Am. i. p. 949. 



In this species the changes which take j)hice during growth 

 are simihir to tliose which occur in (Juhicejrs gracilis, the 

 body being much deeper in the young, which liave shorter 

 and subsynmietrical pectorals and longer ventrals. The 

 ventral fins are inserted distinctly anteriorly to the pectorals 

 in very young specimens, below them in older fish. 



D. X-Xr, I 25-27. A. Ill 25-27. Sc. 64-66,44. ^'^^' 

 rakers of moderate length, about 18 on the lower part of the 

 anterior arch. 



The changes during growth can be best represented in 

 tabular form, the numbers in the various columns representing 

 in millimetres: — A, total length without caudal; B, depth of 

 body ; C, length of head ; D, length of snout ; E, eye dia- 

 meter J F, interorbital width j Gr, length of pectoral ; H, length 

 of ventrals. 



A. B. C. D. E. F. G. n. 



The scales are deciduous, the body being covered with 

 numerous very small mucous pores. 



CUBICEPS. 



Cubiceps, Lowe, Proc. Zool. See. 1843, p. 82. 

 Atwwsto7na, Smith, 111. Zool. S. Afr., Fish. pi. xxiv. (1845). 

 Navarchus, Filippi & Verany, Mem. Ace. Sci. Tor. (2) xviii. 1860, p. 7. 

 Trachelocirriis, Doumet, Eev. et Mag. Zool. 1863, pi. xv. 



This genus is closely allied to Nomeus, but differs in having 

 shorter ventrals, which are inserted posteriorly to the pectorals, 

 broad coracoids which form a long symphysis causing the 

 thorax to appear cultrate, and a patch of teeth on the vomer 

 and on the tongue at least in the young, whilst palatine teeth 

 are absent. 33 vertebra. Caudal deeply forked. 



Synopsis of the Species. 



a. D. XI, I 20-22 ; A. Ill 19-20. 



Depth of body equal to length of head, 3* times 



in total length. Sc. 66 ^ 1. C. capcnsis. 



Depth of body 4-4^ times in total length. 



Sc. 58-06 j^ 2. C. gracilis. 



