89 



Text-Fig. 4. Strnctnre of the Gills 



,- R. PosNtremaMcus dorsalis.lX 



, --Branchial arch, 

 ,''' ,. Efferenr branchial vessel 



_,- R Pre-rremaricus primus X. 

 _,.- R Pos^-l"^ema^lCus venfrahs IX. 

 __,-—-- Afferent- branchial vessel 



Base of gill ray.. 



,- Filarnent-ar muscle 



~'- Afferent'' 

 filamenhar vessel 



Capillary plexus. 



Gill ray. 



-Efferenr filamenrar vessel 



Gill ray. . 



Capi'l 



piliary plexus 



■•r--;.*? 



^^m:^^ 



m^ :::-:- c 



>^^^ 



e*.. — r 



Vascular lamella. 



A. Diagramnuitic tnuisversc section tlu()Uj;li Brancliial arch I. B. Trans- 

 verse section of a double fihunent, sliowini;- tiie surfaces of two laniellaj. 

 C. Longitudinal section of a single tilaineut in a 2)lane at right angles to A. 



