ACTINIARIA 



99 



{sp.) in the different regions of two specimens {a. specimen from Nordre Stromfiord, b. specimen taken by 

 Fasting). They differ considerably in size from those of Peachia hastata and bockii. The size of the cap- 

 sules was as follows: 



Column n. tentacles n. 



in spec, a 25—29 (34) x 3.5—4 ft 32—36 X 4—5 ^ 



in spec, b 25—29 x 3,5 29—39 x 4 (5) 



tentacles sp. 

 19 — 26 X 2,5 fl 

 17 — 22 x 2.5 



actinopharyns «. 

 35—41 X 4—5^ 

 29 — 41 (commonly 36) x 5 



In the specimen a. the nematocysts were typical with invisible basal part to the spiral thread ; in 

 the specimen b. the basal part was discernible. Probably tliis difference is due to the preservation of the cap- 

 sules. The nematocysts are numerous in all regions; 

 the spirocysts of the tentacles comparatively few. 

 The endodermal circular muscles of the column are 

 rather strong, but form no spliincter. The ectoder- 

 mal longitudinal muscles of the tentacles are well 

 developed. The ectoderm of the siphonoglyphe is de- 

 void of nematocysts, and its albumen-cells are few 

 in comparison with those of the actinopharjmx, 

 which has no longitudinal muscles. The number of 

 the mesenteries is that typical of Peachia. In one 

 specimen one dorso-lateral pair of mesenteries is weak 

 and a little coalesced with the actinopharynx. It is 

 expanded in aboral direction a short distance below 

 the actinopharynx (compare below the description 

 of a young specimen of Peachia hastatal) The 

 muscles of the mesenteries mainly are of the 

 same appearance as in other Peachia species. The 



longitudinal muscles, however, form no concentrated pennons in the region of the glandular streak, but 

 are spread over almost the whole breadth of the mesenteries (textfig. 127), wlierefore the pennons look more 

 like a ribbon. The folds are rather high and mainly of about equal height, here and there with certain inter- 

 spaces; there are, however, also lower folds. In transverse-sections the pennon recalls a comb. The pennon 

 merges into the parietal muscles without distinct limit. Below the region of the filaments the pennons are 

 more contracted (textfig. 126). The parietal muscles are weak with few and low folds, on the pennon-side 

 not distinctly differentiated from the pennon, on the opposite side distinctly Umited, but not reaching the 

 distal end. They are not expanded on the column. The mesenterial filaments are of typical appearance and 

 only developed in the mesenteries of the first cycle. Stomata are present on the perfect mesenteries. The 

 oral stomata are large, but the marginal stomata very small and placed in the vicinity of the oral disc. I 

 have not observed any reproductive organs in the specimens I have sectioned. 



13* 



