A C()LLECTIU\ OF HVDKOIDS. 327 



Male : the general shape of the gonangium is the same as 

 that of the female, it is provided with an apical pore {B, po.) 

 in place of the large operculum ; the spermatic tissue is 

 carried on one side of the blastostyle without the formation 

 of a well-defined gonophore. 



Length 0*485 mm., breadth 0"223 mm. 



As above remarked, both male and female gonangia arise on 

 the same main stem ; it is interesting to note that at the distal 

 end of the stem, where the male gonangia occur, the accumu- 

 lation of nutritive substances common to the colony mvist be 

 in less quantity than lower down, where the female gonangia 

 are found. It is conjectured that the determining cause of 

 the observed arrangement of the male and female elements is 

 the relative nutritive supply at the distal and proximal por- 

 tions of the stem. 



Systematic Position. — The present liydroid comes fairly 

 near to Gattya humilis Allman,^ with an unknown locality 

 (possibly from the Cape). The former resembles the latter in 

 the toothed margin of the hydrotheca, and in the jointed 

 condition of the lateral nematophores ; it differs from it in 

 having a definite pinnate series of lateral branches, in the 

 presence of a median nematophore above the hydrotheca, and 

 in the general shape of the sarcotheca?. 



Paragattya intermedia exhibits a remarkable mixture 

 of characters typical of the Eleutheroplea and S t a t o p 1 e a . 



The characters which it shares with the Eleutheroplea 

 are : 



(1) Presence of median nematophore above hydrotheca, 

 seen also in Antennella natalensis, and in the aberrant 

 K ir c h e n p a u e r i a mir ab i 1 i s. 



(2) Lateral nematophores carried on processes from the 

 stem and jointed, bi-thalamic. 



(3) Mesial nematophore below hydrotheca not adnate to 

 hydrotheca. 



The characters which it shares with the Statoplea are : 



' Alhnan. G. J., " Description of Australian, Cape, and other 

 Hydroida," " Linn. Soc. Jonrn. Zool.,' vol. xix, 1885, p. 156. 



