8 MARINE POLYZOA. 



4. CATENICELLA AURITA. PI. IV. figs. 1, 2, 3. 



Cells oval or subglobose. Avicularia large and strong, two 

 blunt processes, the upper the longer, on each side of the open- 

 ing in front. Fenestrae 5, around a central one. 

 Hob. New Zealand. Cook's Straits, Lyall; Campbell's 



Island, Hooker. 



5. CATENICELLA AMPHORA. PL IV. figs. 4, 5. 



Cells oval, sides rendered straight upwards by the wide avicu- 

 laria, which are prolonged above into an acute spinous process, 

 and support a shallow cup. Fenestra3 9, pyriform, an oval central 

 perforation ; an elevated band extending from the sides of the 

 aperture to the upper angular processes of the avicularia; an 

 elevated flattened band, along the middle of the back, branching 

 off above to each avicularium. 



Catenicella amphora, Busk, Voy. of Rattlesn. i. 356. 



Cellaria catenulata? var. B., Lamarck, An. s. V. ii. 180 (2nd ed.). 



Hab. Bass' Strait, 45 fathoms. 



Of a bright reddish brown colour, and in the younger cells very 

 transparent. Forms small irregularly branched bushes, 4 to 6 

 inches high and wide. It is peculiar by its extremely regular 

 vase-like form of cell, which is given by the continuation up- 

 wards of the broad avicularia in nearly a straight line, and their 

 prolongation into a sharp angular spine, on the inner side of 

 which is a shallow cup-like cavity, whose sides are usually more 

 horny than calcareous. The number of fenestrae appears to be 

 very constant. 



The length of the branches before their dividing, and their 

 straightness, together with the colour of this species, render it 

 not improbable that it is the form intended by Lamarck (/. c.). 



6. CATENICELLA PLAGIOSTOMA. PI. V. figs. 1, 2. 



Cells short, ovoid. Avicularia nearly as long as the cell, termi* 

 nating in an acute spinous point, and supporting a deep cupped 

 cavity above; aperture placed obliquely; front of cell divided 

 into five large subtriangular fenestrse by four broad bands. Back 

 of cell with a broad central band and two narrower bands branch- 

 ing from it on each side ; surface of spaces left uncovered by the 

 dorsal bands beset with setose spines. 



Catenicella plagiostoma, Busk, Voy. of Rattlesn. i. 358. 

 Hab. Bass' Strait, 45 fathoms. Swan Island, Banks' Strait. 



Colour brownish white ; habit stiff; branches short. This spe- 

 cies is at once recognizable by the peculiar oblique position of 



