Mr. H. J. Carter on a neio Species o/'Tethya. 99 



duous ; but the oblique band on the metasternum seems to be 

 very persistent. 



Isacantha himaculata, 



I. sat angusta, fusco-ferruginea, supra disperse albo-pilosa ; rostro 

 prothorace haud longiore, basi latiore et supra paulo excavato, 

 ci-ebre punctato ; auteanis art. basali breviusculo ; prothorace 

 confertim granidato, versus basin canaliculato ; elytris pai'allelis, 

 apice rotundatis, confertim granulatis, singulis macula alba e pilis 

 condensatis pone medium sitis ; corjjore infra longe albo-piloso ; 

 pedibus ferrugineis, femoribus anticis infra dentibns minutis, 

 duobus apicalibus majoribus, instructis ; tibiis intus denticulatis. 

 Long. 2>h lin. 



Hob, Tasmania. 



A small, rather narrow form, noticeable for the two spots 

 on the elytra and the denticulation of the inner margin of 

 the tibige. 



Pachyura papulosa. 



P. oblouga, postice ampliata, picea, supra confertim grannlata, pube 

 silacea maculatim varia, elytris nigro-maculatis ; rostro longitu- 

 dine prothorace cum capite aequali, crebre oblongo-puiictato ; 

 antennis ferrugineis, art. basali paulo elougato, tertio sequali ; 

 prothorace sparse silaceo-maculato ; elytris singulis maculis nigria 

 in seriebus quatuor notatis ; corpora infra pedibusque rufo-piceis, 

 griseo pilosis ; tarsis nigris. Long. 6 lin. 



Hob. New South Wales (Kope's Creek). 



This species, having the femora unarmed and foveiform 

 scrobes, must be placed with Pachyura \ in habit, however, it 

 closely resembles Isacantha. 



XII. — Description and Illustrations of a new Species of 

 Tethya, ivith Observations on the Nomenclature of the Te- 

 thyadse. By H. J. Carter, F.R.S. &c. 



[Plate IV.] 

 Tethya casula, n. sp. PI. IV. figs. 1-9. 



Massive, erect, sessile, consisting of a hemispherical head 

 or body (PI. IV. fig. 1, a) supported on a conical or umbrella- 

 like expansion (fig. 1,5 5), whfch, in situ, is sunk into the 

 sand, and serves the purpose of a root. Colour light greyish 

 yellow. Surface of the head rough, hispid, from the projection 

 of fine spicules in lines corresponding with polygonal inter- 

 spaces in which the pores (fig. 2, a) and vents (fig. 2, b) are 

 respectively situated. Ends of the spicules radiating from 

 the surface generally, short and erect on the summit, becoming 



