PRELIMINARY NOTES ON GASTRODES PARASITICUS KOROTNEFF, ETC. 587 



Fig. 2 



S 



Fig. 2. Gastrodes farasiticitm Ivorotn. at an advanced stage 

 of development. One of the largest and oldest in- 

 dividuals observed by the author, x 50. The specimen 

 has assumed the almost hemispherical shape as in the 

 figure on liberation from the host. It is usually of a 

 much more flattened shape while within the latter. 

 c. Comb-plates. in. c. Meridional canal 



s. Aboral sense-rrgan. ph. c. Pharyngeal canal. 

 t. /'. Tentacle-basis. /. Tentacle-stem. 



(/. b) is developed in essentially the same way as in ordinary cydippid 

 ctenophores. 



The ventral surface of body, which is sonewhat concave, is beset 

 with cilia all over. The ciliatioa is especially heavy in the central 

 parts around the mouth opening. This leads into the well developed 

 oesophagus, which is to flattened that its longer diamètre lies in the 

 sagittal plane. The oesophagus communicates above with the infundi- 

 bulum situated directly beneath the sense-organ. The infundibulum 

 gives rise to two perradial canals, each of which divides distally into 

 four meridional canals {in. c.) running under the comb-plate rows toward 



