826 EENE8T WARREN. 



place of origin (PI. XLYII, fig. 27, and text-fig. 16^.,/). 

 The pinnjB or lateral branches spring from these processes. 



Diameter of main stem, about at the middle of its length, 

 0*09 1 mm. ; thickness of perisarc 17 fi. 



Diameter of pinna in the middle 0*065 mm. ; thickness of 

 perisarc 10 ^j. Nematocysts, 10*6^ in length, 2*6^ in breadth. 



HydrotheciB. — They occur on all the distal internodes of 

 the main stem, and on all the internodes of the pinna?, except 

 on the short basal pair; there are no intervening internodes 

 without hydrothecfe. The hydrothecte are so inserted on 

 the pinna? that they face directly forwards (B), and not 

 upAvards as is generally the case in the Eleutheroplea. 



The margin of the mouth is deeply notched or toothed. There 

 are normally four teeth, a median back and front tooth, and 

 two lateral. In one or two cases two pairs of lateral teeth 

 have been seen (PI. XLYII, fig. 27, 2 a) ; but the condition 

 should probably be regarded as a freak, as there was no 

 general tendency throughout the shoot for the development of 

 six teeth. 



This indented margin recalls the St a top lea rather than 

 the Eleutheroplea. 



The hydrothecse measure 0'192 mm. in height, and O'lSl 

 mm. in width. 



Hydranth. — About 14 tentacles. 



Gonosome. — The gonangia occur on the main stem; they 

 arise laterally by the side of the mesial nematophore below 

 the hydrotheca. A mass of germinal cells may generally be 

 found in the endoderm just beneath a hydrotheca (text-fig. 



16, audi), .v-'-.). 



Female gonangium ovate and provided with a large oper- 

 culum {C, op.) ; the peduncle is transversely ridged and fairly 

 long. One or more large eggs are carried on the side of the 

 blastostyle and become pushed into an apical position (text- 

 fig. 16, C, 1)1.0.), and there segmentation takes place, and large 

 planul^e are formed. The planula escapes, settles down and 

 develops the usual rosette-structure [B, young). 



Length O'olO mm., breadth 0"22o mm. 



