BY K. VON LENDENFELD, PH.D. 521 



ramification of the connecting fibres of sufiicient value to base 

 genera thereon. For those reasons and also because the chagrin 

 like surface is found in other species I do not consider the genus 

 Coscinoderma Carter (1) as necessary and I place his and also 

 some species which Polejaefi" (2) assigned to this genus in the 

 genus Euspongia. 



I have examined a dry sponge kindly forwarded to me by 3Ir. 

 Mathew, R.N., which I named after him as above. Only afterwards 

 I ascertained that this species is probable identical with Carter's 

 species above mentioned. 



The description of the soft parts is taken from Carter I.e., that 

 of the skeleton is original. The notes given me by Mr. Mathew 

 corroborate Carter's description. 



This sponge is excellently adapted for bathing purposes and used 

 for that purpose in the Caroline Islands. 



Shape and Size. 



Stipitate, expanding from a round stem in the form of a battle 

 dore-shaped or triangular lamella, with conical processes on the 

 upper margin. It measures 210 mm., in width and height and 

 40 mm., in thickness (Carter's largest specimen). Larger specimens 

 were seen by Mr. Mathew. 



Surface. 



Surface for the most part even throughout, interrupted only by 

 a small proliferous projection or out-growth on one side and a line 

 of vents situated pandean pipe like along the upper border, between 

 which the structure is denticulated. Pore sieves in the interstices 

 of the cribriform incrustation which forms a reticulate chagrin like 

 structure in consequence of the abundance of sand grains etc., in 

 this net-work. The meshes of this net-work are 0*52 mm., wide. 

 The lines a little wider. 



(1) H. J. Carter. Contributions to our Knowledge of the Spongida. 

 Annales and Magazine of Natiiral History. 5th Series, Vol. XII., No. 17, 

 p. 309. 



(2) N. PoUjaeff. The Voyage of H.M.S. Challenger. Part XXXI. 

 Report on the Keratosa, p. 50 fF. 



