280 ERNEST WARREN. 



and arranged at the base of the hypostome in a single series. 

 It also agrees in the exceptionally delicate natnre of the 

 hydrocaulns. It differs from prolifera in possessing 28-35 

 tentacles instead of 8, and also in the place of origin of the 

 reproductiye bodies. In prolifera free mednsa? are budded 

 from short processes which spring from the base of the 

 hydrocaulns, while in the present species such processes are 

 budded by the hydranth itself. It is, of course, very probable 

 that free medusas are also formed by multitentaculata. 



(5) Tubularia so lit aria Warren. 



TuBULAEiA SOLITARIA Warren, 'Ami. Nut. Gov. Mus.,' vol. i, 1906, 



p. 83. 



This species, which occurs embedded in siliceous sponges, 

 has been fully described. It is a solitary form, and in the 

 arrangement of the endodermal canals and in other ways it 

 is allied to Corymorpha ; but the occurrence of an actinula 

 in deyelopment has caused it to be referred to Tubularia. 



(6) Tubularia betheris sp. n. (PI. XLV, figs. 10 and 11 ; 

 PI. XLVI, fig. 12.) 



This graceful hydroid was found in a sheltered rock-pool 

 near the Coast Quarry, between Park Rynie and Alexandra 

 Junction. It was attached to the rock by a small hydrorhiza. 

 The colony consisted of 4 individuals, and its height was 

 about Ij inches (fig. 10). 



The hydranths are translucent, and the hydrorhiza and 

 hydrocaulus are a very pale brown. 



Trophosome. — The hydrorhiza is a branching stolon 

 creeping over the surface of rocks or worm-tubes. 



Diameter 0'34mm., thickness of perisarc 20;«. 



Hydrocaulus. — It consists of upright stems springing 

 irregularly from the hydrorhiza and bearing terminal polyps. 

 The perisarc is irregularly ringed, especially towards the base. 



Diameter 0*30 mm,, thickness of perisarc 14 ^<. 



Hydranth. — The general shape is rather elongated and 



