Plate I. 



Fig. i. Pennatula aculeata Kor. Dan. from Davis Straits. The specimen, which is seen from the 

 ventral side, is of an unusual violet colour. The pen is highly contracted and somewhat 

 damaged. The specimen when just taken, was painted on board the :<Ingolf by the artist- 

 painter Sigurd Wandel; somewhat enlarged (See p. 12 No. i). 



Fig. 2. Protoptilum carpenteri K611. (the Ingolfs specimen No. 3, p. 52); seen from the ventral side; 

 x 3. b younger polyps which on developing will make the pen two-rowed. 



Fig. 3. Id.: seen from the dorsal side; the same enlargement, n the naked streak. 



Fig. 4. Protoptihim thomsoni K611. The top of a specimen taken by the Michael Sars (No. 10, p. 57), 

 seen from the left side; x 3; n the naked dorsal streak, / the top of the rhachis. 



Fig. 5. Id.: a piece from the middle of the rhachis seen from the left side; X 3; from a specimen 

 taken in the Skager Rak (No. n,p. 57), belonging to the Riksmuseum in Stockholm. 



Fig. 6. Id.: the lower part of the rhachis, seen from the left side; x 3; from the same specimen 

 (No. u); n the dorsal, n' the ventral naked streak. 



Fig. 7. Id.: a piece of the middle part of the rhachis, also seen from the left side, but turned in 

 such a way, that the ventral streak n' is seen, whilst the dorsal streak is hidden; V ventral 

 side, D dorsal side; X 3; of the polyps only the calyxes have been drawn so that the arrange- 

 ment of the polyps may be distinctly seen; the same specimen as in figs 5 and 6. 



Fig. 8. Id.: the lower part of the rhachis, seen from the right side; x 3; i, 2, 3, young polyps form- 

 ing together an oblique row rising towards the dorsal side D; i, i, i the oldest polyps 

 in each oblique row (cotnp. fig. 7). The lower part of the rhachis (together with the peduncle) 

 is twisted round the calcareous axis in a somewhat spiral-shaped manner. The same specimen 

 as in figs 57. 



Fig. 9. Protoptilum denticulatum n. sp., seen from the dorsal side; x 2. P terminal polyp, Z terminal 

 zooid; a somewhat larger, b somewhat smaller and more ventrally placed polyps. * the place 

 where the lower bend of the inner calcareous axis is found. 



Fig. 10. Id.: seen from the ventral side; x 2. The signification of the letters as in the preceding figure. 



Fig. u. Id.: the top seen from the left side; x 3. P terminal polyp, '/, terminal zooid, z dorsal zooid, 

 / lateral polyp. 



Fig. 12. Distichoptihim gracile Verr., part of the rhachis seen from the dorsal side. The colour taken 

 from a coloured sketch made on board the Ingolf by the artist-painter Sigurd Wandel. The 

 polyps retracted; z dorsal zooids; x 3. 



Fig. 13. Id.: the upper end of the rhachis of another specimen (No. 6, p. 64) x 5, to show the teeth 

 of the calyx-mouth, the (apparent) terminal zooid 2, and the (likewise apparent) terminal polyp; 

 comp. p. 64. 



Fig. 14. Id.: the upper end of a third, somewhat deviating specimen (No. 9, comp. p. 65); x 2; k the 

 upper, knob-shaped end of the rhachis. 



Figs. 2 14 drawn by Th. Bloch. 



