ACTINIARIA 



69 



inner parts, and provided with secondary branches. The lamellar part of the mesenteries issues from about 

 the middle of the pennon (textfig. 84). The endoderm of the pennons is high between the actinopharynx 

 and the reproductive region, with numerous vacuoles on the side where the folds are ; on the opposite side, 

 however, it has no such vacuoles, but densely packed nuclei. The parietal muscles (textfig. 85) expand rather 

 far on the column in the reproductive region and still farther in the distal end of the column (textfig. 85). 

 The filaments are of usual appearance, the ciliated streaks short. The animal is dioecious. One examined 

 species was a male, another a female. The nematocysts in the ectoderm of the scapus of the specimen, taken 

 by Roemer and Schaudinn, were a little smaller (24 27 x 3,54,5 /t) than those of the type-specimens. 

 As far as I can see from the structure of the badly preserved specimen it belongs to M. nathorstii. The lon- 

 gitudinal pennons and the parietal muscles are of the same appearance as those of the type. 



Genus Paraedwardsia Carlgr. 



Diagnosis: Milne-Edwardsiinae with no physa or only a weakly developed one. Scapus with a 

 more or less well developed cuticle and with scattered "#a/caw/>a-papillae". Nematocysts of the scapus- 

 ectoderm scattered, with a tendency to arrange themselves in groups; they are comparatively broad, in pro- 

 portion to their length. Nematocysts of the scapus and of the capitulum of about the same size. Inner ten- 

 tacles longer than the outer ones, now hexamerously, now octomerously(P) arranged. A weak ventral sipho- 

 noglyphe present (always?). 



This genus which was characterized by myself in a few words in 1905 is distinguished from the nearly 

 related Milne-Edwardsia by haying on the scapus "#a/ca/>a-papillae" which are absent in Milne-Edwardsia. 

 Concerning the structure of these papillae, also occurring in other Actiniaria-geuera, I refer to the genus 

 Halcampa. Whether the tentacles always are arranged hexamerously I cannot confirm. In the type P. are- 

 naria the number of the tentacles appears to be 16, but whether they are arranged 6 + 6 + 4 or 8 + 8 is 

 difficult to decide as the state of preservation of the tentacles was not good. Probably the tentacles of this 

 species are distributed according to the latter type. It also remains to verify the presence of a ventral sipho- 

 noglyphe in this species. P. sarsii (Dub. & Koren) belongs to this genus besides the type P. arenaria Carlgr. 



Paraedwardsia arenaria Carlgr. 



PI. I. Fig. 15, 16. 



Paraedwardsia arenaria n. sp. Carlgren in Nordgaard 1905, p. 158. 



Diagnosis: No distinct physa. The most proximal part of the body, however, probably without 

 "Hafcam/>a-papillae. Scapus with a somewhat thick cuticle? (periderm) and with scattered "//a/ca;/>fl-papillae" 

 to which grains of sand are attached. Ectoderm of the scapus with scattered nematocysts partly 17 22 

 X 3 n, partly 26 29 X 4 ft. Nematocysts in the capitular ectoderm partly 14 X 2 //, partly about 24 X 

 2,5 p. Capitulum and scapus in preserved state with 8 indistinct longitudinal furrows. Tentacles 16, prob- 

 ably in two cycles. Nematocysts of the tentacles about 24 X 2/1, spirocysts to about 28 40 ;i long. Nema- 

 tocysts of the actinopharynx partly 20 22 x 2 //, partly 31 36 X 3 //. Longitudinal muscle-pennons of 



