154 SIDNEY F. HARMER. 



calcified with the exception of a minute central pore. The colony is seen to 

 originate in the "primitive disc," the calcified body-wall of the larva. 

 Godosund, Bjorne Fjord, Norway, June, on Lamiuaria saccharina. 



Fig. 3. — T. aperta. Distal view of the same colony, to show the tube of 

 the ooeciostome. Two of the accessory ooeciostomes (numbered as in fig. 2) 

 are also seen. 



Fig. 4. — T, flabellaris, Fabr. (p. 99). A stunted colony, in which the 

 proximal ends of the oldest zocecia were obscured by foreign substances. The 

 lateral parts of the colony are bent backwards round the Cellularia peachii 

 on which the specimen is growing. 1 — 6, ooeciostomes of the six mature 

 ovicells, ooeciostome 4 being concealed from view by the zocecia. The ovicells 

 to which the ooeciostomes 5 and 6 belong are seen not to have completed 

 their growth. 7 is a young ovicell. Barents Sea, 50 fathoms, July 1 ; 

 dredged by Colonel H. W. Feilden. Greatest diameter of colony, 2"36 mm. 



Fig. 5. — T. phalangea. Couch (p. 94). Fertile lobe with a single ovi- 

 cell. s. septum between two contiguous lobes of the ovicell. Salcombe 

 estuary, 4 — 5 fathoms, March — April, on Rhodymenia ciliata. 



Fig. 6. — T. phalangea. Zooecium, with the ooeciostome, broken off from 

 a colony, and placed in such a position as to show the ooeciopore. Salcombe 

 estuary, 4 — 5 fathoms, March — April, on shell. 



Fig. 7. — T. liliacea, Pall. (p. 90). Part of ovicell, with two series of 

 zocecia and an ooeciostome. Plymouth, 30 — 40 fathoms, March — April, on a 

 Hydroid. 



Fig. 8. — T. liliacea. Fertile lobe seen from its distal end, to show the 

 ooeciostome, the upper lip of which projects so as to conceal the ooeciopore, 

 which opens horizontally. The proximal end of the lobe is the lower side of 

 the figure. Plymouth, obtained with the last specimen on a Hydroid. 



Fig. 9. — T. liliacea. Lobe in which no ovicell is yet apparent, to show 

 the biserial, Idmonea-like arrangement of the zocecia. Plymouth, obtained 

 with the last specimen on a Hydroid. 



PLATE 9. 



The sections figured are all longitudinal. Fig. 10 was drawn with Zeiss F, 

 figs. 11 and 13 with -j^ oil-immersion, figs. 12 — 22 with DD. All the 

 figures were afterwards reduced |. 



[The microscopical sections which are referred to as T. plumosa 

 are those in which excretory vesicles were discovered in the 

 tentacles; those referred to as T. phalangea are the specimens in 

 which no excretory vesicles were seen in that position. Unless 

 otherwise stated, the discrimination of these two species in 

 sections depended entirely on this character.] 



