62 



ME. S. 0. EIDLEY OF THE 



fuDdameutal character, of which his union of the genus Alcy- 

 onella with Flumatella, and even the species of the former with 

 species of the latter genus in a long list of synonyms, is not the 

 most radical of the changes. 



It is, however, my object on this occasion to draw attention to 

 but one part of the existing systems which seems to require 

 remodelling. 



The diagnosis of Lophopus, as given by Allman (Z. c. p. 83), 

 runs : — " Coenoecium sacciform, hyaline, with a disc which serves 

 for attachment but not for locomotion ; ectocyst gelatinoid ; 

 orifices scattered. Statoblasts elliptical, with an annul us, but 

 without marginal spines." 



Jullien (1. c. p. 139), besides characters derived from the 

 general relations of the colony as a whole, inserts in his defini- 

 tion of the genus : — " Statohlastes elliptiques pourvus d'un anneau 

 sur le pourtour ; anneau termine en pointe aux extrernites du 

 grand diametre." 



The discovery, as detailed below, of a new species of the genus 

 in Australia, involves the giving up of the last-named character 

 as of generic importance, and Lophopus remains distinguished 

 from Cristatella by the absence of spines from the statoblast 

 and of a locomotor disk from the colony, and from Fectinatella 

 chiefly by the former character. 



LoPHOPiJS Lendeistfeldi, n. sp. 



Zoarium forming chain-like or contort linear growths, the 

 zocecia being aggregated into small linear groups, which are con- 

 nected with each other by stolon-like lobes. Zooids deeply 

 divided from each other within the ectocyst, tubular, ending 

 below in rounded, slightly constricted knobs termiuated by a 

 special thickening of the outermost layer of the endocj'st. 

 Ectocyst perfectly hyaline, about 1 millim. deep, forming low mam- 

 millse, about "02 millim. high, which contain the zooecial orifices. 



Tentacles about 50 in number, the longest longer than the 

 endocyst-body. Epistome not observed. Ectocyst (in spirit) 

 hyaline, colourless; endocyst-bodies pale yellow. Statoblast 

 strictly elliptical in outline, annulus almost flat ; body very 

 convex. 



Measurements. — Length of extended polypide (the portion 

 within ectocyst-sheath) about 1 millim. Diameter of neck of 

 zooBcium (endocyst) about '02 millim. Length of lophophore,from 



