ACTINIARIA 



35 



is taken from the sexually ripe Samso-specimen with 12 tentacles. Though the number of folds variates 

 in the different specimens the folds agree in appearance. The outer lamellar part of the mesenteries is attached 

 to the pennon rather close to the centre. The weak, imperfect mesenteries in the uppermost part of the 

 column are comparatively well-developed. The mesogloea off-shoots, supporting the parietal muscles, are often 

 dichotomously branched and delicate, like the main lamella of the mesogloea. The folds of the parietal 

 muscles vary considerably in number, as shown by the textfigures 24 of the Samso-specimen and by a speci- 

 men from Bohuslan (textfig. 23) (compare note p. 33). 



In larger specimens the parietal muscles appear similar to those of the textfigure 23. The expansion 

 of the parietal muscles on the column is the ordinary one. 



Remarks. This species is nearly allied to E. tuberculata, but is distinguished from this species by 

 a more delicate form, by fewer folds of the muscles in the pennons, and above everything by smaller nemato- 

 cysts of the nemathybomes. To this we might object that this difference in structure is due to a difference in 

 age. As, however, the smallest specimens examined of E. tuberculata are smaller than the larger of E. longi- 

 cornis, and as nevertheless the nematocysts of the two specimens differ very much in size, I must regard them 

 as two different species. Besides this, E. longicornis seems to live in more shallow water than E. tuberculata 

 which prefers deeper water. I have never found E. longicornis to reach the dimension of E. tuberculata, and 

 yet I have a great material of the former for examination. 



Edwardsia pallida (n. sp.). 

 Edwardsia clavata var. pallida n. var. Carlgren 1893 p. 12, 14 PI. 2 figs. 5 9. 



Diagnosis. Physa well-developed. Scapus with a thin periderm with irregular aggregates of nema- 

 thybomes. Nemathybomes in the aggregates mostly very closely packed. Nematocysts of the nemathybomes 

 partly 36 53 X 2.5 //, partly 62 74 X 5 ., the latter often curved. Tentacles 16, now very short, cylindrical, 

 not pointed, now longer and more conical. Nematocysts of the tentacles 17 19 X 1.5 (2) p, their spiro- 

 cysts ii 14 x i 1.5 (2) //. Nematocysts of the actinopharynx partly 22 26 X 1.5 2 //, partly 29 36 

 X 2.5 fi. Longitudinal muscle-pennons rather strong, in the upper part of the reproductive region in trans- 

 verse sections elongated with at most 20 (about 14 17) folds. Outer and inner part of the pennons com- 

 paratively richly branched with high folds, the middle part with simple or only slightly branched, short 

 folds. The outer lamellar part of the mesenteries attached to the pennon not far from the outside. Parietal 

 muscles in the reproductive region rather strong, with folds somewhat closely arranged, rather high and a 

 little ramificated. Mesogloea in the parietal muscle-tract thickish. The expansion of the parietal muscles 

 on the column is the ordinary one. 



Colour. Physa uncoloured. Scapus mostly dirty-grey, sometimes ochreous-yellow, especially in 

 the upper part. Capitulum uncoloured, transparent, its upper part sometimes yellowy-white with indistinct 

 white lines on each side of the mesenterial insertions. Close to the tentacles a reddish-brown area is sometimes 

 found, but it only seldom forms a continuous annulus as it is interrupted by the white lines. Tentacles un- 

 coloured, transparent, with a brown streak at the base, at the inside of their apex a more or less distinct 



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