ZOOPHYTOLOGY. 321 



.and perhaps nicay represent a variety of the same species, which is also 

 stated to come from the Mediterranean. 



3. 0. rmitica, n, sp., Busk. PI. IV., figs. 2, 3. 



Mouth plain ; crescentric above, with a straight inferior margin. 



Hall. Philippine Islands ? or Australia? 



A minute form, sufSciently distinguished from its congeners by the 

 above character. The polyzoary is constituted of short internodes, con- 

 nected by a flexible horny tube. The only specimen I have is very small, 

 •and it is constituted of short internodes, composed of 8 or 10 cells. Its 

 habitat is doubtful, but I believe it to be one or other of those above 

 assigned. It is growing on a fragment of coral. 



Some apology is requisite for the proposal of a new generic 

 term, to a form which has probably been long known under 

 another name ; but in the present case it appeared justifiable, 

 from the consideration that the term Cellaria, which is the 

 only one that could have been taken, has been understood in 

 so many senses ; and that the species at different times in- 

 cluded under it have been so frequently subdivided into other 

 groups, as to render its continued use likely to produce much 

 confusion. 



The species having articulated polyzoaries composed of 

 cylindrical internodes, in which the cells are disposed around 

 an imaginary axis, were originally confounded by Pallas under 

 his genus Cclhdaria, and by Solander under that of Ccllai'ia, 

 with many others, not possessing that peculiar characteristic. 

 The term Cellaria, however, was subsequently restricted by 

 Lamouroux to those polyzoaries, which had cylindrical 

 branches, or rather in which the cells were disposed around 

 a central axis ; but as this restricted sense of the term has not 

 been adopted by many subsequent writers, nor especially by 

 Lamarck, and as it has long since ceased to be applied to the 

 genus SalicornaTia, it seems as well perhaps to dispense with 

 it altogether. 



Otiier forms again have been confounded under the same 

 term Cellaria by several writers, among whom may be noticed 

 Reuss, in his account of the fossil polyzoa of the Vienna 

 tertiaries, who includes under it Vincularia, Defrance {Glaii- 

 conoma, Goldfuss). Whilst Hagenow, on the other hand 

 (Die Bryoz d. Maastrich, Kneidebildung), adopts Vincularia 

 and ignores Cellaria. In Vincularia, proper, however, the 

 polyzoary is continuous throughout, and not subdivided into 

 internodes by flexible joints ; so that there appears to be no 

 reason whatever for associating the two. 



The following fossil foims might be referred to the genus 

 Onchopora ; and it would appear that no species belonging to 

 it occur in formations anterior to the tertiary, unless the 



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