with Observations on Australian Hydroids. 83 



Callicarpa, Fevjkes. 



Trophosome as in Plumularia. 



Gonangia protected by phylactocarps, which consist of 

 nematocladia, arranged verticillately, and occupying a short 

 distinct branch. 



The principal difference between Callicarpa and Hippurella 

 is in the position of the gonosomes, which in the former 

 genns form distinct branches, instead of being the distal 

 portions of the ordinary ones. In the single species which 

 is known the phylactocarps are produced in verticils of 

 three, and each one is twice bifurcated, so as to form four 

 spine-like ramuli, each whorl thus consisting ultimately of 

 twelve ramuli, which curve upwards, the whole gonosome 

 resembling a spike of barley. The close alliance with the 

 preceding genus is obvious, and, as Mr. Fewkes remarks, 

 "it is^ morphologically speaking, as if the proximal part of 

 the branch which bears pinn83 in Hippurella was reduced to a 

 peduncle, and the distal end, with its verticillate ribs, became 

 the gonosome." 



Gattya, Allman. 



Hydrocladia springing directly from the hydrorhiza, or 

 from other hydrocladia, borne on jointed peduncles; hydro- 

 thecae with a toothed margin; lateral sarcothec^ movable. 



This genus is peculiar in its habit, the hydrocladia growing 

 directly from the hydrorhiza, or springing irregularly from 

 each other; but in either case the basal part is composed of 

 a number of short joints without appendages, forming a 

 sort of peduncle. The anterior sarcotheca is of the fixed 

 type found in several of our Plumularite (which would be 

 included in the genus Heteroplon of Allman), and the toothed 

 calycle is, according to Professor Allman, unknown elsewhere 

 •among the Eleutheroplea. 



STATOPLEA. 



The genus Aglaophenia, as understood by Hincks and 

 Kirchenpauer, included the whole of the Statoplean 

 Plumulariidse, both Phylactocarpal and Gymnocarpal. 

 Professor Allman separated the species with unprotected 

 gonangia, under the name of Halicornaria, but at first 

 associated with them a species {H. saccaria) which has the 

 gonangial ramules slightly modified. I suggested in the 



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