128 "TEKKA NoVA ' KXl'KDlTloN. 



resjion (jf the head; tliis is an cxpaiisidii of the anterior part of tin- dorsal 



lill-lnl,l. 



(G) i'igmeut is wantiii.ti'. except for a ine.liaii Mack spot on the parietal region and 

 s(jme pigmented areas on the tail. In specimens of U mm. (and less) there 

 is a dark area ahove and another helow on the caudal peduncle: in larger 

 ones the dnr,sal area spreads forward on cadi siilc of the adipose tin. and 

 the ventral one may disappear, or may l>c replaced hy a median series ot 



Yi,; 3_ Distrihutiou oi; Mi/ctupldiiu inituicliciiia. llcconlcd t-aptuivs of the ;ulii!t iirc marked + ; larval 



and post-larval .stages tsikcu by the " Terra Nova," ■. The map shows the extreme limit of 



pack-ice — . -^ --^ '-~- '-^, and the iiiiviii auiiu.-d .surface isotherms of G C. and 



12" C. 



dark spots. jH'oKalih' tin' precursors of the inlVacaudal plates of the ailull 

 fenude. 



Examples of Kl to 1 •_' nun. are ot'teii inoi'c elongate, and have no pliotopluu-es 

 and no pehic tins : tiie adi[»ose tin c.xlends forwai-il lo the dorsal : the dorsal tin is low. 

 and its ravs ai'c undeveloped or just evident. The maxillary reaches only to below the 

 anterior part oi- midille of the eye, which is relatively larger than in the sjjeeimens of 

 14 to 18 mm., wliilsi the snoui is correspondingly shorter. 



