20 MARINE POLYZOA. 



C. monotrypa, Busk, Voy. of Rattlesn. i. 368. 



Hab. Australian Seas (ubique); New Zealand, Hooker-, Lyall. 



This is at once distinguished from C. peachii by the cuspidate 

 point on the summit of the median cell at each bifurcation, and 

 the smoothness of the surface of the ovicell. 



2. CELLULARIA PEACHII. PI. XXVII. figs. 3, 4, 5. 



Cells subelongated, attenuated downwards, truncate and some- 

 what rounded above. A small spine on the upper and outer 

 angle sometimes wanting. Three to five perforations behind. 

 Mouth oval, regular; margin subincrassate, minutely granular. 

 Ovicell subglobular, with a tessellated surface. 



Cellularia Peachii, Busk, Ann. Nat. Hist. New Ser. vii. 82. pi. 8. 



figs. 1, 2, 3, 4. 



Cellularia neritina, var., Johnst. Brit. Zooph. i. 340,, ed. 2, 

 Bugula neritina, var., b, c, d, e, Gray, List Brit. Rad. 114. 

 Hab. Britain (north?). 



3. CELLULARIA ORNATA. PI. XXVI. figs. 3, 4. 



Cells immersed, nearly square ; front surrounded by a raised 

 line, within which the surface is granular ; five to seven minute, 

 scarcely conspicuous perforations behind. 



Hab. Algoa Bay. 



2. MENIPEA. 



Cells oblong, or elongated and attenuated downwards ; imper- 

 forate behind, with a sessile avicularium frequently absent on the 

 upper and outer angle, and one or two sessile avicularia on the 

 front of the cell below the aperture. 



Menipea, Lamx. Bull. Soc. Philom. 1812, Polyp. Flex. 

 Cellaria, part., Linn., Solander. 

 Crisia, part., Lamx. Polyp. Flex. 61. 



Tricellaria, Flem. Brit. Anim. 540, 1828 ; Blainv. Man. d'Act.45S ; 

 Gray, Brit. Rad. B. M. 113. 



The essential character employed to distinguish this genus, is 

 the presence of one or more sessile avicularia on the front of the 

 cells below the aperture, and usually of a sessile avicularium at 

 the upper and outer angle. Although these characters are in 

 themselves artificial, yet the group formed by the aid of them 

 appears to be for the most part pretty natural. With the excep- 

 tion of one or perhaps two species, at present referred to this 

 genus, the Menipea have three or six cells only in each internode. 

 The branches are consequently loose and straggling, and usually 

 incurved at the extremities, as is best seen in Menipea cirrata. 



