384 W. M. Bale: 



art) frequent, iiieluding two to four tubes in succession, and I have 

 seen an instance where the regenerated tube was bifurcated. In 

 several instances I observed just within the margin the remains of 

 what seemed to be a septum with a small central aperture. In 

 many portions of the polypary the central thread of coenosarc, or 

 ratlier its disintegrated remains, persisted, with branches running 

 otf to the polyp-tubes; nowhere, however, were any hydranths to be 

 found, nor any remnants of them, nor were any hydrothecae pre- 

 sent. 



In some instances the tubes bore small collapsed membranous- 

 looking capsules, which seemed to be the earliest stages of the 

 gonothecae. Two or three capsules were observed in a more 

 advanced condition; these were about 1.2 nam. in length, of a com- 

 pressed ovate form, and much resembling the male gonangia of 

 IldJecium gracile ; they contained the remains of the zooids. On 

 making a more extended examination of the material than I had 

 previously done, in the hope of discovering the hydranths, I found 

 several much larger receptacles, presumably adult gonangia. They 

 were elliptic sacs of about 4-5 nmi. in length, formed of an ex- 

 tremely thin, colourless perisarc, and having the whole external 

 surface coated with grains of sand, Foraminifera, and calcareous 

 fragments. These were firmly adherent, and on forcible removal 

 M'itli a needle left their impression on the perisarc. The capsules 

 appeared empty, so far as could be observed through the interstices: 

 of the sand-grains, but no apertures were visible; it is quite- 

 jDOssible, however, that ruptures might be present, but not trace- 

 al)le owing to the investment of foreign matters. 



According to the descriptions of Lamarck and Lamouroux, the- 

 T ihlana ramosa of the former author would seem to be a form 

 nmch resembling the present, but "svith the polyp-tubes less deve- 

 loped. In Tihiana, Lamarck comprised zoophytes presumably 

 allied to Tubularia, but with the polyps borne laterally along the 

 stem and branches instead of terminally. 2\ fasciculata, the type- 

 species, has often been figured; it is acutely zig-zagged, with an 

 aperture at each angle; it has not been identified, and is probably 

 not a Hydroid. 2\ ramosa, according to Lamouroux, is most likely 

 not a Tihiana, and, in fact, there is no reason to assume any 

 relationship between the two species. 



Schweigger has figured T. ramosa, but very crudely; the figure, 

 however, shows all the irregularity which characterises the pre- 

 sent species; some of the polyp-apertures seem merely holes in the- 

 perisarc, while others are situated in distinct protuberances. Om 



