54 



ACTINIARIA 



numerous nematocysts, about 84 101 X 3 p in size. They were often curved and therefore difficult to 

 measure. The endodermal circular muscles of the column are well-developed. The nematocysts of the ten- 

 tacles are numerous and 19 24 X 2 ft in size, the spirocysts reach a length of unto 18 /i. The rather numerous 

 nematocysts of the actinopha- X*^^*^ 



rynx are 3843 x 3 . 



The longitudinal pennons 

 of the "Edwardsia -mesenteries" 

 are strong, in the reproductive 

 region with 25 to 30 folds which 

 are high in the outer part of the 

 pennons and here rather richly 

 branched, while the inner part is 

 lower and only little ramificated 

 (textfig. 63). The outer lamellar 

 part of the mesenteries issues at 

 a good distance from the outside Fig. 63. 



of the pennon. The parietal niUSC- Xextfigs. 63 64. Edwardsia vegae. Transverse section of pennon (fig. 63) and of 



les are rather strong, with some- P arietal muscle ( ^' ^ 



what numerous folds which are long in the outer part, in the inner one short. The former are placed almost 

 perpendicularly to the lamella of the mesenteries; the latter are turned inwards (textfig. 64). Whether the 

 parietal muscles are continued on the column I cannot decide as they were not well preserved in their 

 outer part. The species is dioecious; the specimen was a female. 



Edwardsia finmarchica n. sp. 



I'l. I, figS. 10, 12. 



Diagnosis: Physa well-developed, perforated by apertures. Scapus-periderm thin. Nemathybomes 

 very small, but numerous, scattered over the whole surface of the scapus, not discernable to the naked eye. 

 Nematocysts of the nemathybomes (26) 36 48 (62) X 3 3.5 (4) ft, those of the capitulum 10 12 /*, those 

 of the tentacles 22 26 X 2.5 3 //, those of the actinopharynx 30 35 X 2.5 3 p. Spirocysts of the tentacles 

 14 17 IJL long. Tentacles 16 26 (or more?). Longitudinal pennons of the mesenteries very strong; in trans- 

 verse-sections elongated ; in the reproductive region with about 50, not very high folds which are rather richly 

 branched. The outer lamellar part of the mesenteries attached close by the outside of the pennons. Parietal 

 muscles in the reproductive region not very strong, trianguloid, with comparatively few folds. The parietal 

 muscles are not at all or only very slightly expanded on the column. 



Colour in preserved state: Scapus ochreous-coloured. 



Dimensions of a well-preserved specimen with extended tentacles. (PI. i, fig. 10): I/ength of the 

 column 3.2 cm, largest breadth 0.45 cm. Physa and capitulum 0.4 cm each. 



