98 T. KOMAI : STUDIES ON TWO ABERRANT CTENOPHORES 



t.sh Tentacle-sheath. 



t.sh.d Dorsal compartment of Icnlacle-sheath. 



t.sh.v Ventral compartment of Icntaclc-slieath. 



vc ...Vacuolated epithelium of cndodcrmal wall. 



v.d Sperm-duct. 



v.ep Ventral epidermis. 



Plate 1. 



All fiijures are sketches in living state 

 Tig. I. A l)ranch of a stock of Dendronephthya sp., with several Coelopla>tac (C. bucki) 

 on its surface; X i. 



2. Cocloplana wiUeyi Abbott in extended state; X2 



3. Coeloplana mitsuktirii AbbdTT in extended state and willi one of the leiilaelcs 

 fully ilrawii out; X2. 



4. Coeloplana bocki KoMAl in extended state and with both tentacles about to 

 Ije pushed out; X3 



Figs. 5-15. C. bocki; x 170. 



5-7. Larva of the stage in which pigment spots have appeared for the lirst 

 lime, i. e„ stage somewhat more advanced tlian in I'l. 7, Figs. 1—3: 

 Fig- 5- View on transverse plane. 



6. Aboral view. 



7. Oral view. 



rigs. 8—10. Larva of somewhat more advanced stage; 

 Fig. 8. Aboral view. 



9. View on transverse plane. 

 10. View on sagittal plane. 

 I'igs. ir-i2. T/arva of still more advanced stage; 

 J'ig. II. View on transverse plane. 



12. View on sagittal plane. 

 Figs. 13-14. Larva directly after hatching out; 

 Fig. 13. View on transverse plane; a posture during swimming. 



14. Aboral Mev*'; larva creeping on the expanded sole of inner surface of 

 jiharynx. 



^ 15. A larva during metamorphosis, adhering to the substratum by the thinly 



spread-out sole; the main body laid back and seen on the transverse plane. 



Plate 2. 



Lig. I. Coeloplana bocki KoMAl in fully extended stale, dra-.vM with the aid of 

 Abbe's drawing apparatus; x lo. 



2. The same, diagrammatic figure showing the structure of body; in the upper 

 half, the gaslro-vascular system and gonads, and in the lower lialf, the tentacular apparatus 

 is shown. 



3. Diagrammatic figure sliowing the structure of Cydipi)id ctenophore. 



4. The same showing the >tucture of Coeloplana viewed on transverse plane. 



