110 BULLETIN OP THE 



Vineularia margaritacea Pourt. 



Irregularly branching, generally at a large angle. White, pearly. Cells 

 set round the axis in six rows alternating by threes, oval, smooth. Aper- 

 ture rounded, with a small notch on inferior border for the attachment of 

 the horny operculum, which is thin and round. Some of the cells have an 

 accessory upper chamber (ovarian vesicle) inflated and cribriform. About 

 1 inch high ; rather abundant off Sand Key in 100 fathoms, and off Ha- 

 vana in 270. 



Fai'cimia cereus Pourt. 



Frustules long, cylindrical, branching laterally from the middle of the 

 older ones. Cells in six rows, alternating three and three, concave, oval 

 Aperture small, horseshoe-shaped, with a pore on each side. In old and 

 worn specimens the operculum giving the shape to the aperture is lost and 

 the latter becomes oval. The space between the cells is then also deprived 

 of a kind of epidermis, and shows rows of pores forming lozenges around 

 the cells. Articulating peduncles horny ; sometimes strengthened by rad- 

 icles. Rather abundant in 270 fathoms off Havana. 



Cellepoi'a reticulata Fourt. 



Flabellate, much anastomosing, pearly ; apertures alternate, directed ob- 

 liquely upward, all on the same side of flabellum, rounded, with small knob 

 on lower part, on which is a small pit for the articulation of the operculum. 

 (The latter all lost from specimen on hand.) About three quarters of an 

 inch high. Off Havana in 270 fathoms. 



Cellepora sigillata Pourt. 



Flabellate, anastomosing, all the cells opening on the same side of the 

 flabellum. Aperture oval, somewhat truncated towards the tup, above 

 which rise four short bristles. Cells irregularly alternate, crowded, con- 

 case. Operculum large, pearly, convex with a. somewhat turned-up lip. 

 Only a small fragment was obtained off Havana in 270 fathoms. 



Canda* retiformis Pourt. 



Flabellate, irregularly dichotomous. Membranous tubular radicles con- 

 necting the branches with each other at about every fourth cell, giving the 

 whole the appearance of network. Cells elongated, thin, half-membranons, 

 alternate, opening on the same side of flabellum, punctated, two short blunt 

 spines at the top. Aperture huge, occupying about two thirds of the cell, 

 protected by a broad T-shaped shield rising from the side of the aperture. 

 About one inch high. OH' Havana in 2 7 U fathoms. 



* Cellarina, Van Beueden. 



