TASMANIAN HYDKOZOA HKKKiS. 289 



Stem iiiternode, leiijj^tli ... ... ... 0'61-0'78 mm. 



Stem iiiteriiode, diameter .. ... ... 0"15-019 mm. 



Hydrotheca, leiiirtli 0-73-0-75 mm. 



Hydrotlieea, diameter at montli ... ... 0"22-028 mm. 



Hydrotheca, diameter at ba><e ... ... 0-08-0"10 mm. 



Dilifn'liKh'ilii. — Previously I'eeoi'ded from Australia (Lamour- 

 oux) ; Port Phillip, Victoi'ia (Bale) ; B'reucli Pass, New Zea- 

 land (Hartlaub) ; Gondii Jslaiid, South Atlantic Ocean 

 (Ritcliie) ; Clj'de Sea Area, Bari-ier Plateau, between Sanda 

 Island and Ailsa Craig, 24 fathoms (Ritchie). 



Family LAFOEID^. 



Geuus Cryptolaria, JJask. 



Cryptolaria arboriformis, liilchle. 



Cnjptolan'ii arltorifonitif, Ritcliie, Mem. Austr. Mus., iv., 16, 

 1911, p. 82-1, pi. Ixxxiv., tig-. 1, pi. Ixxxvii., fig. 7. 



This species is represented in the collection by a single 

 specimen, which is tirmly attaclied to the surface of a Retepora- 

 like Polyzoon, over which it has sent out hydrorhizal tubes in 

 the form of a reticulum, the components of which have inter- 

 laced with the large circular perforations of the Polyzoon. In 

 this manner, a corresponding reticulation has been formed on 

 the under surface of the lietepora, giving the specimen a 

 firm basis of attachment. 



The colony is 12'5 cm. in height, with a diameter of 3 mm. 

 at the base. The type specimen appears to have undergone 

 very severe weathering, since the branches of the present 

 form do not bear " the aspect of bare, gnarled limbs of some 

 weather-beaten tree." The ultimate and most delicate branch- 

 lets have been pi-eserved, thus imparting to the specimen a 

 thick bushy appearance. 



The colour of the colony is light-brown to greenish-brown. 



