Plate III. 



Fig. 33. Pavonaria fimnarcliicn (M. Sars), young (-..Microptikini!,-) stage, from the ventral side, x 2. 



(The specimen No. 3, p. 40). The zooids are not represented in the figure; the\- can scarcely 



be seen witli this enlargement; the bodies looking like zooids are young polyps. 

 Fig. 34. Id.: the upper part of the pen of another specimen (No. 2, p. 40), from the ventral side, x 3. 



a are quite young pol\-ps, / the conical end of the stem. 

 Fig. 35. Id.: the lower part of the rhachis of the same specimen as in the preceding figure, a j^oung 



polyps; X 3. 

 Fig. 36. Id.: the lower part of the pen of the .same specimen as figs. 34 and 35, seen in profile from 



the left to show the J//cw///7«w/-character; comp. the lower part of the pen of KoUikers figure, 



Chall. Rep. PI. VII, Fig. 27 b, of Microptihini ivillcmorsii. 

 Fig. 37. Umbelliila lindahlii YJAX., young specimen, seen from the left, natural size; from Davis Straits 



(see p. 75). 

 Fig. 38. The same specimen; the primary polyp, x 8; most of the tentacles torn off; at k part of the 



upper end of the calcareous axis shines through; p bud of a new poh'p; z zooids. 

 Fig. 39. The same specimen; the lower part of the rhachis, wit^i zooids s', and peduncle; x 8. 

 Fig. 40. Umbellnla liiidahlii, \'oung specimen, natural size; the cluster seen .so much from the dorsal 



side, that P^ the terminal or primary polyp, is distinctly seen. 

 Fig. 41. The same specimen, natural size; the cluster is seen from the ventral side. 

 Fig. 42. The same specimen, part of the cluster, x 3, seen from the ventral side to show the tentacle 



of the zooids, and that the ventral tentacle 7' of the small polyp is larger than the others. 

 Fig. 43. The same specimen; the lowermost part of the stalk, x 6; shows zooids with fine tentacles; 



some zooids have a tentacle with lateral branches (t). 

 Fig. 44. The same specimen; a group of spicules from the lower end of the peduncle; enlargement: 



Zeiss, Obj. apochr. S.o'"™, Comp. ocular 4, length of tube 160""". 

 Fig. 45. The same specimen ; spicules, under higher magnifying powers. Zeiss, Obj. apochr. 8.0""", Comp. 



ocular 12. 

 Fig. 46. Umbellnla oicrinits (I^.). The cluster of a young specimen (No. i, p. 80), seen from the rudiment- 



.side (the ventral side), X3; /* the primary polyp; / tongue-shaped zooid-area. 

 Fig. 47. The same species; another specimen, young stage; natural size (No. 2, p. 80), from the right 



.side of the terminal polyp. P the terminal polyp; z large zooid; a rudiment of a pol}-p; i, 2 



the two polyps on the right side of the terminal polyp; df the dorsal zooid-belt reaching up 



to the base of the body of the primary polyp. 

 Fig. 48. The same specimen as in the preceding figure; part of the cluster, x 3; dt, P, i, 2 as in the 



preceding figure; / the three tongues of zooids on the left side. 

 Fig- 49- The same specimen as in figs. 47 -48; part of the cluster, seen from the rudiment-region (the 



ventral side), x 3. /'. i, 2, dt as above; a rudiments of four polyps; between these rudiments 



stripes of zooids shoot up, the first rudiments of zooid-tongues. 

 Fig. 50. Umbelbila- encrimis ; a large zooid from the inner part of the cluster of a fully formed, large 



specimen, enlarged (of No. 7, p. 80) ; / tentacle with lateral branches; 111 mouth. 

 Fig. 51. Id.: spicules from the lower end of the peduncle (of the .specimen No. 10, p. 80). Zeiss: Obj. 



apochr. 8.0""", Comp. ocular 12, length of tube 160""". 



FiRS-37' 3^. 44. 45. 5" •'^"cl 5' <lrawn by the author, the others bv Th. Bloch. 



