ZOOPHYTOLOGY. 79 



closer comparison the two will be found quite distinct. In the 

 Egean form (of which a figure and description, under the 

 name of E. cervicornis, are given in " Zoophytology^^ [' Quart. 

 Journ. Micr. Soc./ vol. iii, p. 322, PI. IV, figs. 4, 6). The 

 cells, are in the first place, more or less ventricose below, 

 whilst the orifice is not quite circular, and presents a small 

 denticle on the lower border, and has no avicvdarium within it. 



Gen. 2. Psileschara, n. g. 



Tolyzoario erecto, e ramis linear itus subcompressis composito ; cellulas in una 

 faciei tantum gerente; cellulis quincuncialibus, in seriebus longitudinalibus 

 dispositis. 



Polyzoary erect, branched, branches linear, compressed ; cells opening on 

 one side only, quincuncial in longitudinal series. 



1. P. Maderensis, n. sp. Pi. XXXII, fig. 2. 



Cellulis superne liberis subtubulosis, ad basin immersis, margine elevato cir- 

 cumdatis; ad later a pundatis, superjicie granulosa, avicularium mandibulo acuta 

 ascendente, infra orijicium medio gerentibus. 



Cells free and subtubular above, immersed below, surrounded with a 

 raised border, and punctured on the sides ; surface granular. An avicula- 

 rium immediately below the orifice in the middle and front ; mandible acute, 

 ascending. 



Hab. — Madeira, /. T. J. 



In a list of some fossil Polyzoa, collected by the Rev. J. E. 

 Woods in South Australia, given by me in 'Quart Journ., Geol. 

 Soc.^ (vol. xviii, p. 261), I have enumerated two species of 

 Escharidae, which differ from the other members included in 

 that family in having a simple, branched, not reticulated, 

 polyzoary, constituted of a single layer of cells, that is to say, 

 in which the openings of the cells are all on one side of the 

 branches, the opposite surface presenting only the backs of 

 the cells. To these two fossil forms is now to be added a third 

 living one. The Family Escharidae will now include — 



Eschara, 



Melicerita, 



Biflustra, 



Retepora, 



Psileschara, and 



Caleschara, only known at present as a fossil form. 



II. Cyclostomata. 



Pam. I. Idmoneid^. 

 Gen. 1. Hornera, Lamx. 



1. K. pectinata, n. sp. PI. XXXIII, figs. 4, 5, 6. 



Polyzoarium parvum, bast diffusa affirum, irregulariter ramosum ramus- 

 culis teretibus ; cellularum orificio exserto, denticulate; superficie anteriori 

 sparse punctata, polito, irregulariter sulcata ; posteriori sparse punctata. 



