74 



DE. G. H. rOWLEE— BISCATAN PLANKTON 



They occurred sparingly between 50 and 500 fathoms. 



(iii.) Three large specimens of hexapterine appearance, much compressed, will probably 

 be easily identified by any future observer who takes this species, from the 

 remarkable character of the most dorsal (youngest) jaws (PL 6. fig. 41). 



These specimens came from 500 and 250 fathoms. 



The last specimen had certainly lost some jaws, of which the sockets were to be seen, 

 and probably some posterior teeth. They might possibly be furcata, dead and sinking, 

 for the younger jaws in this species resemble those figured in form, but are less strong : 

 against this was the length and sharpness of the teeth, nor did the fins exactly resemble 

 those oi furcata. 



Krohnia hamata, Moebius. (PI. 6. figs. 42-46.) 



Characters. — Head small ; body slender, resembling bipunctata, firm, retaining its 

 shape (except when considerably damaged), thickest in the middle third, tapering 

 gradually to both ends ; neck fairly well marked ; no collarette. Lateral fins long, not 

 extending posteriorly nearly to the vesiculse seminales, but beginning only a little way 

 behind the septum ; widest point at or just in front of the septum; fin-rays extending 

 about as far in front of the septum as the fin does behind it, but the fin continued 



I 



