CAXAitf.w risiiEini.s i:\rr:r>rri()\, nii'i-i-') 17 



The larva; recorded under the different species are so like the European that, as 

 V role, there was no difficulty in deciding; several species, moreover, have been figured. 

 If we consider, houtner, the insiiiniiicaut nuniher ot unknown ri(nni(ler larva' (of which 

 part could not he determined owing- to accidents in the preservation) it would hardly 

 seem likely that any fjivat number of unknown eerss would be liable to confusion with 

 other species. Of unknown Pleuronectida- tlie followin<i- were taken: — 



Ijength. 



Acadia station 4, 150 — m 1 I'leuronectes? 5 mm. 



38.100 — 0ml " "....'.. 6 " 



No. " 33 " station 39, vertical 1 " 4 " 



No. "33" station 49, vertical 6 " 6-7-6-7-6-7 " 



To these shoidd be added one specimen of 4 mm. lenjith from the Princess station 

 48; probably belonging to the genus Both.us. 



P. limanda ( ?) L. 



A quantity of ova of this species was found on the first and second cruises f)f the 

 Acadia (above the banks off Xova' Scotia and Newfoundland). 



At Surface. In Vertical Hauls. 



Station 29 5 eggs. 5 



30 3 " 8 



36 1 " 



61 ^ " 



62 43 " 



80 2 " 



82 



The diameter of the eggs was about 0-9 mm. and the embryos revealed typical 

 Pleuronectid characters, though none were so far advanced as to ])ermit of their being 

 iiscribed with certainty to P. limanda; they undoubtedly belong, however, to a closely 

 related form. 



According to Jordan and Everniann, this species also is stated as apparently not 

 found off the coasts of North America. 



P. microcephalus ('Donoyiin)=MirrosfomiisJ,-itt (Walbaum). 



At Acadia station 84, a larva of 6 mm., taken in a surface haul, must be referred 

 to this species. 



P. {Gliiploceplialus) ci/nof/Iossits !>. 



(Plate IT, Fig. 11.) 



Of this species, the following specimens were taken: — 



Princess station 34 — Oblique: 1: ca. 6mm. 



" " 49 — Surface: 2 : 8-10 mm. 



" " 50 — 40-0 : 1 : 7 mm. 



Acadm " 83 — Surface : 4 : 6-8 mm. 



There were' thus taken eight larv;e in all, but eggs of this speci&s were not found; 

 these probably did occur in the samples, but must then in some way have been over- 

 looked. P. cynoglossus spawns in European waters from ]\lay to September; the ova 

 have a diameter of 1-07 to 1-26 mm., and are otherwise distinguishable by their slightly 

 striped structure. 



P. cf/noglossus belongs to the North Atlantic; on the American side it extends as 

 far as cape Cod: lives in comparatively deep water, preferably with sandy bottom. 



6551—2 



