APPENDIX. 363 



c. Without vittce or fenestree. 

 13. C. carinata, n. sp. 



Cells oval, narrowed at both ends ; lateral processes, 

 (without avicularia?) projecting horizontally outwards from 

 the sides of the mouth about the middle of the cell. 

 Mouth nearly central, with a small tooth on each side, and 

 below it a triangular space with three strong conical emi- 

 nences. The cell which bears the ovicell geminate. 



Hab. — Bass Strait, 45 fathoms. 



This remarkable form differs so widely in many respects 

 from any of its congeners, as almost to deserve to be 

 considered as the type of a distinct sub-genus. The lateral 

 processes, which may be taken to represent the perfect 

 avicularia of the other species, are, as far as can be ascer- 

 taiued from specimens that have been dried, without a 

 moveable mandible, and are probably really so, because 

 there is no corresponding beak. These processes are chan- 

 nelled in front, nearly from the base to the extremity ; 

 they arise by a broad base on each side of the mouth, and 

 on the front of the cell, and from the conjoined bases is 

 continued upwards and downwards, or to the top and 

 bottom of the cell, a prominent flattened band. The 

 expanded bases circumscribe an oval space, nearly in the 

 centre of the front of the cell, the upper two-thirds of 

 which space are occupied by the circular mouth, on each 

 side of which is a small calcareous tooth, to which appa- 

 rently are articulated the horns of the semilunar lateral 

 cartilage. The lower third is filled up by a yellow, horny (?) 

 membrane, upon which are placed three conical eminences, 

 disposed in a triangular manner. The back of the cell is 

 very convex, and has rimning along the middle of it an 

 elevated crest or keel, which is acuminate in the middle. 

 The ovicell is situated iu front of the cell below the mouth, 

 and below it are three considerable-sized areolated spots, 

 disposed, like the thi-ee conical spines, in a triangle. The 



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