LARVAL AND I'OST-LA 1! A" AL FLSHES RE(!AN. 129 



MiictdjiJiiiDi iintin-ctii-mii is very siiiiil.-ir in Ini'in. |ii'n|)iii'tii)iis. |i(isiii(.n of llic fins 

 and niinil)cv of rnys, luuuhfi- of myotonies, etc., to tin- noillicni .1/. iihicinlr. K'cinli., 

 the principal differences l)etween them residing in the nundter and arrangement of tlie 

 photophores. Holt (P.Z.8. 1898, pp. 5,52^.560, pis. XLVI, XLVII) has descrilied young 

 stages of the northern sjiecies. and it is interesting to note the resemlihnices and 

 differences 1>etweeu these and ron'csponding stages of .)/. (in/di-cfii-iun. There is a 

 general resemhlance in the development of tlie two species. Imt .)/. (jliirinl,' ;it 8 mm. 

 long corresj)onds to M. auiarctlcum of lU to 12 mm. and at 1 I • f) mm. to JA (tiit((riii<-iiiii 

 of 16 to 18 mm., whilst at 14 "5 mm. M. iihirinlr has the general characters of the adult 

 fish, except that the eye, although considerably larger than in smaller examples, is not 

 yet proportionately as large as in the adult. Post-larval examples of ,)/. (jhiciaU differ 

 from con'esponding stages of M. iiiiturctiriun in that they are not noticeahh' elongate 

 in form as compared with the adult, the alidomen is pronunent, the dorsal sinus extends 

 from head to dorsal fin, and the latter is much higher than in M. (tntan-tiriini. 



Vj\{'\\ if postdarval .)/. (jhiciidi' appear less elongate tlian I he same stages of 

 M. iiiiliirctiriint to a. great extent because the depth is increased by the large dorsal 

 sinus and the protul>erant abdomen, yet if these features be neglected, the southern 

 species is at this early age noticealily more slender than the northern one. In both, tlu; 

 eyes at first grow at a slower rate than the fish as a whole, as is the rule in fishes 

 generall}-, but later on grow faster than the rest of the fish, so that thev are propor- 

 tionately much larger in the atlult tlian in the young. Holt's exjjlanation — that this 

 is due to the fact that the adults live at greater depths than the young — may Ijc 

 unreservedly accepted. 



2. A NEW PARALIPAPtlS. 



Pdrnliparis trrrac-norac, sp. n. (PL I. fig. H). 



A young fish, o.5 mm. long, was taken in ^b-.Murdo Sound on dan. Kith. 1'.)I2. at 

 Station 332, 77° 15' S.. l(i(i'' 0' E., 0-550 metres, it is very similar m most respects to 

 P. antarcticuK , Regan, but differs notalilv in the fewci' tin-rays (dorsal 55 ; anal 4:>) 

 and in the form of the pectoral ffn, which has no elongate lower rays. This is the 

 second Antarctic species of this genus. 



3. THE NOTOTHENHEUK.M I-'ISIIES. 



The ■■ Terra Nova " (-ollccTion imludes young stages oi Plnmir/rajniua, Piuji'ttrpxlK 

 and Chidiidilnird. I'rom the Koss Sea and .McMuido Sound. As 1 have already made a 

 systematic rcxision of the Nototheniil'ornics and lia\c gi\rn a general account of their 

 distribuTion.il sccmcil worth while to try and com[ilcir tliis work by describing the 

 ego-.s and vouii" of the wdiole "roup, so far ;is ])ussible, from the material in the British 



