ACTINIARIA 



39 



tocysts. The nematocysts of the actinopharj'nx are also of two sizes. The size of the spirocysts (sp.) and 

 nematocysts (n) in the diverse regions of the body is as follows. 



Habitat 



nemathybomes 



capitulum 



n. 



tentacles 

 n. .sp. 



actinopharynx 



Little Belt (Mo rt. 1900) 



— ( — 1912) 



— (Schiodte) . 

 The Sound (St. 27) 



— (St. 42) 



— (St. 43 a) ... . 



— (St. 30) 



(Liitken) 



29-39 X 3-5-4 ft 



24-33 X (2.5) 3* 



26-43 X (2.5 3-3.5 



29-41 X 3-5-4 



24-41 X 3 



32-43 X 3 



29-43 X 3-3.5 



26-41 X 3-3.5 



31-43 X 3-3.5 



55-72 X 5 u 



55-65 X 5 

 46-55 X 5 

 48-65 X 4.5-5 

 53-72 X 4-5 



7-12 X 1.5 « 



17-19 X 1-2 jU 

 17-19 X 2 



17-19 X 2 



14-18 X 1.5-2 



10-14 X 1-2 fl 

 10-17 X 1-2 



10-14 X 1-1.5 

 10-14 X 1.5 



17-19 X 1.5- 

 15-19 X 1.5- 



24 X 2-2.5 ," 



29-34 X 2.5 

 26-31 X 2-2.5 



Measured on sections. 



The 8 " Edwardsia-mesenteries" have well-developed, longitudinal pennons. The folds are rather 

 high, but not as branched as in E. pallida (textfigs. 30, 31). The most ramificated folds are situated in the 

 outer part, but also in the innermost part there are one or two such folds. The middle part of the pennon 

 is more weak. The number 

 of the folds is about the 

 same as in E. pallida. The 

 outer lamellar part of the 

 mesenteries is attached to 

 the pennon at some distance 

 from its outside, in the repro- 

 duced pennon (fig. 30) a Uttle 

 nearer to the centre. The 

 parietal muscles are com- 

 paratively weak, and more or 

 less dichotomously branched \ 

 (textfig. 32), they are, how- 

 ever, sometimes a httle 

 stronger than the reprodu- 



Fig. 32. 



Textfigs. 30-32. Edwardsia danica. 

 Transverse sections of pennons (figs. 

 30,31) and parietal muscle (fig. 32) 

 in the upper part of the reproduc- 

 tive tract. Figs. 31, 32 spec, from 

 Little Belt (Mortensen 1900). 

 Fig. 30 from the Sound St. 27 

 (iiSven Nilsson«). 



Fig. 30. Fig. 31. 



ced ones. The expansion of the parietal muscles on the column is considerable. 



Remarks. Among the Swedish species this species is the most nearly related to E. pallida. The 

 arrangement of the nemathybomes is, however, another here, the number of tentacles in some cases greater, 

 the smaller nematocysts of the nemathybomes shorter, etc. 



Edwardsia arctica n. sp. 



Dimensions. Physa ordinarily developed. Scapus with a rather well-developed periderm, especi- 

 ally in the lower part. Nemathybomes somewhat large, probably arranged in 8 longitudinal rows, possibly 

 a little scattered in the proximal part. Nematocysts of the nemathybomes 38 — 60 X 4 — 5 ,u, those of the 



