824 " THETIS " SCIENTIFIC RESULTS. 



They project upwards and outwards from the stem at an angle 

 varying about 45°. The aperture is round and smootli-Iipped, 

 and is, along with the distal part ot" the hydrotheca, turned 

 upwards so that it lies obliquely to the axis of the hydrotheca. 

 This angularity is increased by tlie occurrence of additional 

 regenerated margins which are frequently present. The upward 

 bending of its extremity gives to the hydrotheca a peculiar 

 asymmetrical appearance which occurs in but few species. A. 

 well-defined diaphragm separates a hydrotheca from its stalk. 

 Gonosome. — Not present. 



Dimensions. — 



Height of colony 10 mm. 



Axial tube, diameter O'llmm. 



Branch, diameter 007-0"08 mm. 



Hydrotheca, length 0-24-0-31 „ 



,, diameter at mouth .. OlO-O-ll „ 



Stalk, length 0-13-0-22 „ 



Remarks. — The present species closely approaches Lafoea con- 

 vallaria, AUman, but here the habit of the hydrotheca is more 

 rigid ; the curving of the pedicles does not occur ; that of the 

 hydrotheca is less exaggerated ; and the hydrothecao themselves 

 are more tubular and less flask-shaped. The trophosome of 

 Lictorella concinna exactly resembles that of L. cervicorjiis, 

 Nutting, with the exception that in the former nematophores are 

 entirely absent. So remarkable is the resemblance between tiie 

 two species that I have repeatedly, but in vain, made search for 

 traces of nematophores, thinking that I might have previously 

 overlooked them. Without evidence that the presence or absence 

 of such structures falls within the range of everyday variation, I 

 must consider their absence significant. The presence of tliese 

 structures would, in the classification usually adopted, give 

 Nutting's species the designation Zygophylax cervicornis 

 (Nutting). 



Locality. — Station 44, off Coogee, five to six miles from shore; 

 •depth, 49 to 60 fathoms; bottom, fine sand; 15th March, 1898. 

 Very rare. 



Type Specimens. — In the Australian Museum, Sydney. 



CRYPTOLARIA ARBORlFORMISi^, sp. nov. 



(Plate Ixxxiv., fig. 1 ; Plate Ixxxvii., fig. 7.) 



Station 44. 



IVophosome. — A single robust colony, 15 cms. high, with thick 

 gnarled stem, 5 mm. in diameter at the base, which immediately 



^"^ Arbor a tree ; for mis implying resemblance in shape. 



