136 PEOF. ALLMAN ON NEW HTDROIDA EEOM 



distally in a funnel-sliaped tube which bears the circular even 

 orifice. 



Locality. Bass's Straits. 



This species attains a height of about 2 inches. The gonangium 

 is a beautiful object, with its strong and regular annular ridges 

 and terminal funnel. Its resemblance to a boy's top has sug- 

 gested the specific name. 



Seetulaeella dieeusa, u. sp. (PI. XI. figs. 1, 2.) 



TropJiosome. — Colony much branched; stem monosiphonic, 

 giving off alternate branches which repeat the ramification of 

 the main stem ; main stem and branches jointed at distant in- 

 tervals. Hydrothecse adnate to internode for about half their 

 height, then strongly divergent and slightly tapering to the orifice, 

 which is bidentate ; two pairs of hydrothecse borne by an inter- 

 node ; widely separated, and with a somewhat secund disposition 

 on the principal branches, more closely set and bilaterally disposed 

 on the ultimate ramuli ; main stem destitute of hydrothecse. 



Gonosome not known. 



Locality. Eockaway. 



The present species attains a height of more than 9 inches. 

 Its habit, with its long flexuous stems and profuse ramification, is 

 strongly suggestive of certain long-stemmed Campanularidans, 

 such as Ohelia longissima of the European shores. One of its 

 most remarkable characters is found in the presence of more than 

 one pair of hydrothecse on each internode, a character in which 

 it shows an approximation to Tlmiaria ; while the constancy of 

 the number of hydrothecse borne on an internode, and their 

 freedom for a great part of their height from coalescence with 

 the internode, offer features more in accordance with the cha- 

 racters of the genus to which it is here referred. 



DiPHASIA. 

 DiPHASIA BIPINNATA, U. Sp. (PL XII. figS. 1, 2.) 



TropJiosome. — Stem monosiphonic, pinnate, pinnae alternate. 

 Hydrothecse exactly opposite, deep, tubular, adnate to the inter- 

 node for about two thirds of their height, then abruptly diverging, 

 emarginate at epicauline side of orifice, where they give attach- 

 ment to a valve-like lid. 



Gonosome. — Gronangia (iu female) large, springing by a narrow 

 base from a point in the mesial line just below each pair of 

 hydrothecse, gradually widening upwards and terminating distally 



