2:u 



Miss Jane Stepliens on 



Subfamilv Ecnoxi.wn. 



IJvmedesniia zetlandica, Boxcer- 



buuk. 



tiiincata, Lundhcck. 



Ivoehleri ( Topstnt). 



cnrvicliela, Linidbeck. 



paiipertas (liorverbaiih). 



paiisa, Jiowitbank. 



occulta, Boxcerbank. 



baculifera ( Topsent). 



uiutabilis (Topsent). 



crux {Scfuniflt). 



digitata, lAunlbeck. 



nuicroiiata [Topsent). 



tenui.'ipruia, Luivlbeck. 



dujardini [Bowerbank). 



lielga?, sp. n. 



spinosa, sp. n. 



hiberiiica, sp. n. 



Ectyodoryx atlanticus, pp. n. 

 AncbiDoe fictitius (Bowerbank). 

 Stylo.«ticbon plumosum (Mon- 



tayii). 



deudyi, Topsent. 



Pocillon byndiaani (Bouerhank). 



l*]urypou clavatutn (Bowerbank). 



bispiduUnn (Topsent). 



aibue ('Topsent). 



acantbotoxa, sp. n. 



ditoxa, sp. n. 



tenuissiinum, sp. n. 



niicrocbela, sp. n. 



Licazei (Topsent). 



viride {Topsent). 



!Microciona arniata, Bowerhank. 

 Clatbria dicbotoma (Esper). 



(?) ancborata (Carter). 



Ecbinoclathria foliata (Botver- 



ba?ik). 

 Oplilitasponpia seriata (Grant). 

 Plocaniia microcioiiides (Carter). 

 Suberotelites denionstrans, Topsent, 

 Easpailia piiniila (Bowerbank). 



bowsfu (Boxcerbank). 



Cyanion spinispinosum ( Topsent). 

 Iibabdereniia puernei, Topsent. 

 Spauioplon arinaturum (Botcer- 



bank). 

 Leptosastra constellata, Topsent. 



Family Axinellidae. 



Axinella pyraniidata, sp. ii. 

 Pbakellia ventilabruui (Johnston). 



robusta, Boiverbunk. 



rugbsa (Borocrhank). 



Bubaris vemiiculata (Boicerbank). 

 Ti-flgosia infundibuliformis {John- 

 ston). 



Tiagosia arclica ( l^osinaei). 

 Iligginsia tbielei, Topsent. 

 Hymeniacidon caruncula, Boicer- 



hank. 

 Halicnemia verticillata {Boiver- 



bank). 



Preliminary Description of the New Species. 



I'ylodesma informis, sp. \\. 



Tlie sponge is growing in a tliick encrustation on coral. 



Tlie main skeleton is an irregular reticulation of tylostyli. 

 In places the spicules are collected into burulles or short 

 fibres. The dermal skeleton consists of broad strands of" 

 tylostyli closely packed together and lying tangentially to 

 the surface. 



Spicules. — (1) Tylostyli. The shaft is slightly curved and 

 fusiform ; the head is well-defined, oval or rounded. The 

 size varies from about 37 mm. by 0*008 mm. to 1*3 mm. 

 by 0*027 mm. (2) Sig-mata. These are contort and their 

 lonjjer axis is 0'035-0'045 mm. in length. 



