TH. MORTENSEN. 



[REP. OF THE "MICHAEL SARS" NORTH 



rnh v 



Fig'. 1. Gastrovascular system of Aulacoctena acuminata; sliglitly 

 diagrammatic. 3 /,. ap. apical organ, ar v ' subsagittal adradial vessel ; 

 ar. v. 2 subtransversal adradial vessel; excr p. excretory pore; inf. 

 infnndibulum: inv. apical invagination, I. inner lips of oesophagus; 

 1. pr. lateral process from tentacle basis; m v 2 subtransversal meri- 

 dional vessel: o. m. v. 1 opening of the adradial vessel into the sub- 

 sagittal meridional vessel, p f. polar held; ph. v. pharyngeal vessel; 

 pr. ar. v.' proliferations from subsagittal adradial vessels; pr. ar. v. 2 

 proliferation from subtransversal adradial vessel, pr m. v. 2 prolifera- 

 tions from the subtransversal meridional vessels; those of the side 

 tnining towards the spectator have been cut near the basis, while those 

 of the other side, lyinsr in the side wall of the lateral furrow are 

 complete: pr. ph. v. proliferations from the pharyngeal vessels; sag. 

 the narrow, sagittal edge of the pharynx; t. b tentacular basis, t. sh. 

 tentacle sheath; tr. v. transverse vessel. 



rnv' 



r*iv' 



/ir. ar v ' 



fh/ 



ar.v'. 



Fig 2 



Transverse section of Aulacoctena acuminata ; slightly dia- 

 l 



fibres, m. v. 1 subsagittal meridional vessel; m. v. 2 subtransversal 

 meridional vessel, ph. pharynx; ph. f. pharyngeal folds; ph. v. 

 pharyngeal vessel; pr. proliferations from meridional vessels; pr.ar. v. 1 

 proliferations from subsagittal adradial vessels ; pr. ar. v. 3 prolifera- 

 tions from subtransversal adradial vessels; pr. ph. v. proliferations 

 from pharyngeal vessel; s. ph. f. sagittal pharyngeal folds; t. sh. 

 tentacle sheath. 



S ? 



Fig. 3. Fig. 4. 



Fig. 3—4. Diagrams of the gastrovascular system of Aulacoctena (3) and of a typical tentaculate Ctenophore (4). ar. v. adradial vessels, 



1 subsagittal, - subtranaversal; ir. v. interradial vessel (not found in Aulacoctena); m. v. meridional vessel, ] subsagittal, 2 subtransversal, 



ph. pharynx; ph. v. pharyngeal vessel; t. tentacle; tr. v. transverse vessel; t. sh. tentacle sheath; t v tentacular vessel. 



