Plate II. 



Fig. 15. Pennatula prolifera n. sp., young specimen (comp. p. 18), seen from the ventral side; x 5. Z the 



top-zooid, only partly visible, part of it being hidden between the two uppermost lateral 



polyps. I— VIII the more developed pairs of wings; i, 2, 3 the single polyps of these, 



according to age; IX— XII the four rudimentary wings. 

 Fig. 16. Id.: from the dorsal side, x 5. n zooid-less (,; naked ) dorsal streak. 

 Fig. 17. Id.: a very young specimen, x 5, from the ventral side; there are two pairs of wings (I, II) 



consisting of two individuals, i and 2; below these, two rudiments on each side. 

 Fig. 18. Id.: the same specimen as the preceding one, seen from the dorsal side. '/. top zooid, z 



dorsal zooid. 

 Fig. 19. Id.: a still )ounger specimen from the ventral side, x 5. i, 2 the two individuals of wing I, 



the only wing as yet present. 

 Fig. 20. Id.: the same specimen as the preceding one, seen from the dorsal side; Z and z as above. 

 Fig. 21. Id.: the pen of a }oung specimen with five pairs of wings, seen from the dorsal side, x 5. 



The top is in process of being separated-off. 

 Fig. 22. Id.: the ujDper part of the pen of another specimen with the same number of wings, from 



the dorsal side; also x 5; the upper end of the calcareous axis is seen in the stem (seep. 22); 



the top is likewise in process of being separated-off. 

 Fig. 23. Id.: the top of the pen of a third specimen, from the dorsal side, x 6 — 7; onh- the upper- 

 most polyps (I) are drawn; the constriction is present, but the top part of the stem is not yet 



prolonged to any considerable extent. 

 Fig. 24. Id.: the upper end of the pen of a specimen without an\- constriction at the top; from the 



dorsal side, x 6; in the place where other specimens are constricted, there is a large zooid Z' 



(comp. p. 23). 

 Fig. 25. Virgularia mirabilis (O. F. M.), a young ( . Profocajclon.v-) stage, 10,5™'" long (belonging to the 



Riksmuseum in Stockholm); from the dorsal side, x ca. 8; all polyps, with the exception of 



one, completely retracted; / rudimentar\- (i. e. atrophied) polyps; k lateral zooid, ss stalk-zooids. 

 Fig. 26. Id.: a somewhat older young stage, 22""" long, from the ventral side, x ca. 6. At ^2 the 



polyp in question has been cut awa>' (comp. p. 27). 

 Fig. 27. Id.: a still older stage, 45'""' long, from the ventral side, x 4. / the uppermost rudimentary 



wings; 5 wings on one side, 6 on the other, have two developed polyps; the succeeding wings 



below these are three-polyped. a the region of the developed wings, b that of the rudimentary 



wings, c that of the stalk-zooids. 

 Fig. 27 a shows a part of the specimen figured in 27, under higher magnifying power, so that the 



three wing-pohps may be seen more distincth'; in the lowermost wing figured here, the 



innermost (most ventral) polyp * is very small. 

 Fig. 28. Pavonaria finmarchica (M. Sars), young (i.Microptilum,-} stage; a small portion of the middle 



part of the rhachis of the specimen, figured on PL III, fig. 33, from the ventral side, x 5; 



z zooids. 



Fig. 29. Id.: a small part of the rhachis, seen in profile from the right; of another specimen 



(No. 2, p. 40). 

 Fig. 30. Halipteris c//w/// (Kor. & Dan.), young (Lygomorphn^>-} .stage, ca. 73""" long, x 3; from the 



ventral side; a young polyps recently developed. At * the soft parts have been rubbed away. 

 Fig. 31. Id.: a small part of the rhachis of another specimen, seen in profile from the right .side, so 



that it may be compared with fig. 29 of Pavonaria. The specimen is the smallest one of 



Koren and Danielssen's two type-specimens of .Lygoiiiorp/ia Sars// , 106"'™ long (see p. 46). 

 Fig. 32. Id.: the top of a full-grown specimen, 400""" long, from the Fteroes, from the ventral side; 



sliows the different appearance of the caly.x-poinls in different individuals. 

 Figs. 15 and 16 are drawn by C. Cordts, figs. 23, 24, 25 and 26 by the author, the others bx- Th. Rloch. 



