382 APPENDIX. 



other. Each cell is connected with one at either end in 

 the same linear series by a rather wide short tubular pro- 

 longationj and with two on each side iu the contiguous 

 series by narrower tubes^ so that each cell, except in the 

 marginal rows, is connected with six others. It is this 

 mode of interconnexion of the ceUs that affords the diagnos- 

 tic generic character. There is but one species in the 

 present collection, but in Mr. Darwin's there are two 

 others from the Straits of Magellan, as yet undescribed. 



1. D. Crotali, n. sp. Tab. i. fig. 10—12. 



Cells erect, open in front, perforated on the sides and 

 bottom ; a lanceolate appendage articulated to each upper 

 angle. OviceU conical, placed on the upper edge. 



Hab. — Bass Strait, 45 fathoms. 



The frond, though not strictly speaking adnate, as it 

 seems to have no attachments, is usually spread loosely 

 over other polyzoa. There is no appearance of a moveable 

 mandible in the lanceolate appendages, but which, never- 

 theless, most probably represent avicularia. These organs 

 are of a lanceolate form, with an elevated ridge or keel 

 along the back, and slightly concave beneath. They pro- 

 ject in front, slightly depending ; and at the base of each 

 is a rounded eminence. 



Earn. 6. CELLEPORIDjE. 



Polyzoarium massive or crustaceous, composed of ovate 

 cells in juxta-position ; and arranged, more or less regu- 

 lai'ly, in linear series, radiating from a central point or 

 Hue. 



21. Cellepora, Otho Fabricius. 



1. Cellepora bilabiata, n. S]^.? 

 C. labiata ?, Lamouroux. 



Cells deeply immersed ; mouths in some entire and un- 

 armed; in others, with two acuminated conical lips; 



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