118 BULLETIN OF THE 



small, branching, cylindrical, with pores of three kinds : small microscopi- 

 cal, somewhat larger and tubulated, and large round holes. The latter 

 are rather distant, in irregular longitudinal rows. No trace of septa or 

 columella. The internal structure shows a net-work of round canals com- 

 municating with the pores and with each other. The larger holes com- 

 municate with a cavity in the centre, not communicating with the next ex- 

 cept through the small canals ; the walls of these cavities are closely per- 

 forated. No floors or tabulae were to be seen in the only section I was able 

 to make. The largest specimen is one inch high. 

 Off Havana in 270 fathoms. 



Heliopora carinata Pocrt. 



This species differs from the preceding by its much slenderer branches, 

 on which every tubulated pore is at the extremity of a keel or ridge. The 

 larger round pores are proportionally scarcer and smaller. 



Off Havana in 270 fathoms. 



Antennularia triseriata Pourt. 



Tubular stems rising from a clustered root, straight, erect, not branch- 

 ing, corneous, translucent. Hair-like branchlets in three rows. Polyp 

 cells very small, scattered sparsely on the stem, more plentiful but not 

 dense on the branchlets, campanulate, very short on a longer, conical cali- 

 ciform stem. Aperture entire. Ovarian cells in the axilla; of the branch- 

 lets, compressed, semi-lunar or long kidney-shaped, with the aperture on 

 the inside of the upper horn, looking towards the peduncle. 



Eight inches high, dark amber color. Off Sand Key in 100 fathoms. 



Thoa pulchella Poubt. 



Erect, rooted; stem composed of irregularly twisted tubes, regularly 

 pinnate ; branchlets alternate. Cells regularly alternate on the stem and 

 brandies, moderately distant, more or less corrugated, slightly contracted 

 towards the four-sided aperture, the four angles of which form obtuse teeth. 

 Ovarian cells long campanulate, regularly scolloped on the border with 

 square teeth. Peduncles as long as the cells. 



Off Sand Key in 100 fathoms and oil" Havana in 270. 



Thoa capillaris Pouet. 



Erect, irregularly branching. Branches almost capillary. Cells alter- 

 nate, distant, small, tubular, bi- or tri-articnlate ; aperture terminal and en- 

 tile. Ovarian cells large, elongated campanulate, denticulate margin, 

 teeth rounded; peduncles as long or longer than the cell, connected with 

 the latter by a small knob-like joint. One inch high. Off Sand Key in 

 100 fathom-. 



