88 POLYZOA. 



ORDER GYMNOLJEMATA. 

 Lophophore orbicular, or nearly so ; no epistome. 



Sut-order Clieilostomata. 



Pblypide completely retractile ; evagination of tentacular sheath 

 perfect ; orifice of cell sub-terminal, of less diameter than the cell, and 

 usually closed with a moveable lip or shutter; sometimes by a con- 

 tractile sphincter; cells not tubular; consistence calcareous, corneous, 

 or fleshy. 

 Marine. 



FAMILY CATENICELLID JE. 



Polyzoarium divided into distinct internocles by flexible joints, 

 internodes formed by a single series of cells. 



CATENICELLA. 



Cells arising from the upper and back part of the lower one by a 

 short corneous tube, all facing the same way, and forming dichotom- 

 ously divided branches of an erect phytoid polyzoarium ; cell at each 

 bifurcation geminate ; each cell with two lateral processes usually 

 supporting an avicularium ; ovicells either sub-globose and terminal, 

 or galeriform, and placed below the opening of a cell in front. 



Australia. New Guinea. Campbell's Island, South Africa. 

 Mediterranean (?) . 



(<7.) Fcnestraltf. 

 Cells fenestrate in front ; oricells terminal. 



1. C. VentrlCOSa, Busk, Cat. Pol., Brit. Mies., p. 7. Cells oval, 

 compressed; avicularia wide, sometimes supporting a cup-like cavity, 

 sometimes a closed broad conical spine; fencstra? seven, with fissures 

 radiating towards a rounded central pore; front of cell studded with 

 minute acuminate papilla? ; back smooth, sometimes spotted. Dirty 

 white ; 3 or 4 inches long. 



Lyall's Bay, Bass's Straits, 45 fathoms. 



2. C. liastata, Busfc, I.e., p. 7; C. licuspis, Gray, Dleff. N.Z., ii., 

 p. 293. Cells oval ; fenestrse seven to nine, disposed in a crescent, 

 with fissures radiating towards the median line ; avicularia supporting 

 large, pyramidal, pointed, hollow processes, compressed and perforated 

 before and behind by five or six small circular pores. Yellowish 

 white or reddish ; 3 or 4 inches long. 



Lyall's Bay. Bass's Straits, 45 fathoms. 



* 3. C. au.ri.ta, Busk, I.e., p. 8. Cells oval or sub-globose ; avicu- 

 laria large and strong, two blunt processes, the upper the longer, on 

 each side of the opening in front ; fenestra? five, around a central one. 



Cook Strait (Lyall). Campbell's Island. 



4. C. cribraria. Busk, I.e., p. 9. Cells sub-globular, com- 

 pressed, more or less alatc ; avieularia large, without any superior 

 appendage, and prolonged downwards into elevated lateral alse ; fenes- 

 trai numerous, Email, round, equidistant, the outside ones larger; a 

 minute central pore. 



Lyall's Bay. Bass's Straits, 45 fathoms. 



