234 



Miss Jane Stephens on 



Subfamily Ectyoninm. 



J-Jymedesmia zetlandica, Bower- 

 ha7ik. 



trimcata, Lvndheck. 



koehleri (Topsent). 



curvichela, Lundbeck. 



paupertas {Bowerhanh). 



paiisa, Botverhank. 



occulta, Boxverbank. 



baculifera [Topsent). 



nnitabilis [Topsent). 



crux [Schmidt), 



digitata, Limdheck. 



roucronata [Topsent). 



teuuipiguja, Luinlbeck. 



duJKrdini [Bowerbank). 



helgse, sp. n. 



spinosa, sp. n. 



hibeinica, sp. n. 



Ectvodoryx atlanticus, sp. n. 



Anchinoe fictitius [Boiverhank). 



Stylosticbon pluniosum [Mon- 

 tagu). 



dendyi, Topsent. 



rocillon hyndmani [Botrerhanh). 



Eurypon clavatum [Bowerbank). 



hispiduluni [Topsent). 



affine ( Topsent). 



acantliotoxa, sp. n. 



ditoxa, sp. n. 



tenuissimum, sp. n. 



niicrochela, sp. n. 



lacazei [Topsent). 



viride [Topsent). 



Microciona armata, Bowerbank. 



Clatbria dicliotoma [Esper). 



(?) auchorata [Carter). 



Echinof-lathria foliata [Bowe}-- 

 ba7ik). 



Ophlitaspongia seriata [Grant). 



Plocamia microcionides [Carter). 



Suberotelites demonstrans, Topsent, 



Easpailia puniila [Boiuerbank). 



howsei [Boiverbank). 



Cyanion spinispinosum ( Topsent). 



Rhabdereniia gueruei, Topsent. 



Spauioplon armaturum [Bower- 

 bank). 



Leptosastra constellata, Topsent. 



Family Axinellidae. 



Axinella pyrauiidata, sp. n. 

 Phakellia ventilabrum [Johnston). 



robusta, Botverbank. 



rugosa [Bowerbank). 



Bubaris vermiculata (Botverbank). 

 Tragosia infuudibulitbrmis [John- 



Tragosia arclica ( Vustnaer). 



Higginsia thielei, Topsent. 



Hymeniacidon caruncula, Botver- 

 bank. 



Halicnemia verticillata [Botver- 

 bank). 



Preliminary Description of the New Species. 



Tylodesma informis, sp. ti. 



The sponge is growing in a thick encrustation on corah 

 The main skeleton is an irregular reticulation of tjlostyli. 

 In places the spicules are collected into bundles or short 

 fibres. The dermal skeleton consists of broad strands of 

 tjMostyli closely packed together and lying tangentially to 

 the surface. 



Spicule.<i. — (1) Tylostyli. The shaft is slightly curved and 

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

 size varies from about 037 mm. by 0*008 mm. to 1*3 mm. 

 by 0*027 mm. (2) Sigmata. These are contort and their 

 longer axis is 0"035-0'045 mm. in len"tli. 



