LARVAL ANJ) i'USTLAUVAL FISHES-REGAN. 133 



Cliidiiodrnro l-iifltlccnae, Rco-aii (I'l. IV, figs. 2, ?,). 



A larva of 21 iiiin. was taken 1»\' the "Terra Nova" off' Cape Evans at a depth 

 of 10 metres on Oetoher IDtli, 11)11. I'liis is not (piite so advanced as the young 

 Pagctopsifi of 19-20 mm. From these it is readily distinguished hy the longer tail 

 and the more numerous myotomes (ahout fiO), whilst the ])elvic fins are scarcely 

 pigmented except between the spine and the first soft ray. A fisli of .12 mm. from the 

 " Discovery " collection is mucli more advanced, hut the dorsal and ;inal ravs are still 

 undeveloped. 



Cr>/Oiln(ro (PI. IV, fig. 1). 



Three .specimens, in, 17 and 21 ]nm. in total length, from Ross Island 

 ("Discovery" collection) may liclong to an nndescril)eil species of this genus. Tlie 

 myotomes number 55 or 5(>, fewer than in (\ ufkinsui/./, in wliicli 1 count G2. The 

 body is crossed Ijy two dark bands, the anterior on myotomes 27 to 29, the posterior 

 on myotomes 40 to 42 ; there are indications of a third band at the l)ase of the caudal 

 fin. The slender form, produced snout and elongate pelvic fins further distinguish 

 these fishes from larval or post-larval P(((/efoj'sis and Cldonodraco. 



The data given above with regard to the l)reeding and d(M-elopmcnt of the 

 Nototheuiiformes may be summarized as follows: — 



Of the Bovichthyidae nothing is known, and examination of the material in the 

 Natural History Museum gives no results. 



Tlie breeding season varies (.•onsideral»ly ; approximate dates are ]\Iay and 

 September for .species of Nototkenia, July for Tremakniius hansoni and T. /tcrnacchii, 

 November for Pleiwagramma antarcticum, January and IMay for .species of Artedidraco, 

 May for Champsocephalus gunnari, etc., etc. 



The eggs vary in diameter from 1 to 4 mm. when taken iiom ripe females 

 preserved in .spirit ; the dianu>ter would no doubt be greater if eggs freshly taken from 

 the sea were examined. The Notothcuiinae seem to have the smallest eggs, 

 Artedidraco and the Chaeniclitliyidac the largest. In all probability the eggs are 

 demersal throughout the group, and in some species of Xcfafhi'iiin they are known to 

 adhere together in masses. 



In some of the Nototheniinae the newly hatched larvae ai'c abmil (i nun. long. 

 Imi in Arfi'didraci) and the (Jliaenichthyidae they arc [)nilialily twice as long or 

 even more. 



The newlv hatched larvae have a distinct mouth, the mcmbraiions median fin 

 extends forward above to the head and bch)w to the yolk-sac : the anus is situated at 

 or a little behind the posterior end of the yolk-sac, and at the vi\'H' of the fin- 

 mcmbraue; pectoral fins are present, bul ihc pelvics do not appcir until iiiiirh later, 

 except in the ( 'haenichthvidac. I Miring growth the caudal is formed and assumes its 



VOL. I. U 



