ACTINIARIA 



41 



The ectoderm of the capitulum is high and contains scattered nematocysts, about 10 — 12 /i long. 

 The ectoderm of the tentacles is provided with numerous nematocysts 19 — 26 x 2 — 2.5 fi, and very numerous 

 spirocysts, 12 X 1.5 — 24 X 3 //. The actinopharynx-ectoderm contains, in addition to the nematocysts 



'^=^ \ 



Fig- 33- 



F'g- 34- 



Fig- 35- 



Fig. 36. 



Fig- 37- 



Fig. 38. 



Edwarclsia arctica. Transverse sections of pennons (fig. 33 — 35) and parietal muscles (fig. 36 — 38) in the reproductive tract. 

 Figs. 33, 36, specimen from Scoresby Sound, figs. 34, 37 specimen from Mackenzie Bay. Figs. 35, 38 specimen from the Kara Sea. 



mentioned in the table above, also smaller nematocj-sts, 19 — 26x2^ — 2.5/^; possibly these latter belong 

 to the involved tentacles. 



The imperfect mesenteries are verj' weak. The longitudinal muscle-pennons of the 8 "Edwardsia- 

 mesenteries" are not strong and form in the reproductive tract about 10 — 13 only slightly ramified folds. 

 The sections through the reproductive region of three specimens, textfig. 33 spec, from Scoresby Sound (a), 

 textfig. 34 spec, from Mackenzie Bay (b) , and textfig. 35 spec, from the Kara Sea (c) show a great conformity 

 in the arrangement of the folds. The endoderm on the opposite side of the muscle-pennons is strongly lobed, 



The Ingolf-Ex-pedition. V. 9. g 



