MARINE POLYZOA. .95 



base and acuminate. Ovicells immersed (in the young state 

 covered in front by a concentrically marked operculum). (Colour 

 purple.) 



Hab. Bass's Strait, Macgillivray . 



This is doubtless one of the forms alluded to by Lamarck 

 (/. c. p. 277) as brought by Peron and Lesueur from the Indian 

 Seas, and as of a purple colour ; and may probably be the species 

 figured in Rumph. Amboin. 6. t. 87. fig. 5. 



Fam. 13. VINCULARIAD^E. 



Polyzoarium rigid, calcareous, unarticulated ; cells disposed 

 alternately around an imaginary axis, forming dichotomously 

 dividing branches. Surface of polyzoary not areolated. The 

 family includes (among many other fossil forms) 



Vincularia, Def ranee, Diet. d. Sc. Nat. ; Blainville ; Hag enow, 



Bryoz. d. Maest. Kreideb. p. 59. 

 Glauconoma, Goldfuss, Petrefact. Germ. 

 Siphonella, Haaenow (I. c.) p. 83. 

 Cellaria (part.), Reuss, Fossil Polyp, d. Wien. Tertiar-Beckens, 



p. 58. 



Three families of cheilostomatous Polyzoa, characterized by a 

 polyzoarium formed of cylindrical branches in which the cells are 

 disposed around an imaginary axis, are given in this Catalogue. 

 In the first of these (Part I. p. 15), the SALICORNARIAD^E, the 

 branches are articulated by flexible joints, and the ovicells are 

 deeply immersed. In the second, the FARCIMINARIAD^E (p. 32), 

 the polyzoarium is continuous throughout, and the ovicells are 

 prominent and globose; the structure moreover of the only 

 species referred to it is corneous and flexible. In the third, 

 termed the VINCULARIAD^E, and as here constituted, the poly- 

 zoarium is also continuous throughout, but the structure is cal- 

 careous and rigid, and the ovicells are inconspicuous or deeply 

 immersed. 



Whether these distinctions are sufficient to constitute family 

 groups may be a matter of dispute, but, from analogy with other 

 groups of Polyzoa, I think that the articulation or non-articulation 

 of the polyzoary is an important (artificial) character ; and with 

 respect to the Farciminariada, the distinction between the soft 

 and flexible F. aculeata and the forms (fossil) included under 

 Vincularia and its allies, appears to be too marked to allow of 

 their association, independently of the different position of the 

 ovicells. 



The genus Vincularia, to which I have referred the species 



c 



