82 HECORDS OK THE Al'STIJALlAN" MTSKUM. 



liydrothecfe may be quite normal in appearance, or the proximal one may 

 have the ordinary mesial sarcotheca wanting, and a sarcotlieca similar to 

 the cauline sarcotlieca of the hydrocladiate tube present on the interuode 

 beloAv the liydrotlieca. The arrangement of the sarcothecse on the 

 protective appendage is very uniform, each internode being armed with a 

 single sarcotheca, except for one or two instances when two sarcotlieca? 

 were obserA^ed on a single internode. 



Alfinitief. — The present specimen has been i-eferred to the genus 

 Aghioplienopsis, on account of the phylactogonium, which is a jointed, 

 unbranched appendage springing from the pi-oximal internode of the 

 hydrocladium, and bearing a single row of sarcotheca'", and one or two 

 terminal hydrothecae. Plumularians of this type have hitherto been 

 recorded only from North American waters, where they are i-epresented 

 by four species. The discovery^ of a fifth species on the coast of New 

 South Wales is, therefore, of great interest. The species is a well- 

 marked one, ami difters considerably from the pi'eviously-described 

 members of the genus. It is readily distinguished from ^1. liirfiHtu by its 

 single mesial sarcotheca ; from A. d{t;taii>< and .1. cern'lli by its large 

 mesial sarcotheca, which is adnate to the front of the hydrotheca ; and 

 from A. corniita by the front of the hydrotheca, which is without a ridge 

 or keel. 



Loc. — Off Botany Bay, New South AVales, 50 fathoms. 



Holotype. — In the Australian Museum, Sydney. 



Key to the species of the genus Aijluophenopxis : — 

 o. Mesial sarcotheca single. 



h. Mesial sarcotheca small, sejjanite from hydrotheca. 



c. Mary;iii of hydrotheca with a pruminent .anterior touth ; lateral teeth siiallow 



or sinuous A. ilislans. 



cc. Margin of hydrotheca witliout a promiucut anterior tooth ; lateral teeth 



subequal .1. rt-i-rilli. 



hb. Mesial sarcotheca large, adnate to hydrotheca. 



d. Front uf hydrotheca with a prominent ridge or keel .4. cornida. 



dd. Front of hydrotheca without a ridge or keel A. vaga. 



aa. Mesial sarcotheca double .4. hifsuta. 



II. KkVISKIN (IK TllK Hv|i|;(i1I>-FaINA ok lidl.M' HiiWK Isi.AM'. 



Hydroid Zdophvlt's were ])reseut in the cnllections made at \nnd 

 Howe Island in August-September, 18t^7, by a collecting party des[)atelietl 

 by the Trustees of the Australian Museum to this isolateil Island, lioid 

 Howe Island is situated in S. Lat. '.W '.V.\\ and K. Long. Ib^f 5'. Jt is 

 the most southern of the outlying islands on the east coast of .Vustnilia. 



The determination and description of these collections was effected 

 by the Museum staff, and Mr. T. Whitelegge*' prepared a short account of 

 the Coelentei-ata, which included a list of Hydroids collected chiefly From 

 seaAveeds tlu-own up on the sandy beach ol' the lagnon. The Hydroids 

 mentioned in tins list, with their identiticatiou as now uinh-rstodd, are as 

 follows : — 

 Ceratella fiisc((, Gviiy ? ... ... iSolunileria ftiKca {Liviiy). 



Sertnlarella soli(h(U(, Bale .. Sertidarella indii'isa, Bale. 



Eucopella catupanula, Leudfel. ... iSilicidaria campanularia (Leudeufeld). 



« Whitclegge in Etheridge— Mem. Anstr. Mus., ii., 1889, p. 41. 



