Catalogue of No7i-Calcarco7is Sponges. 43 



The British Museum specimens show conclusively that Pluino- 

 halichondria inainmillata is a mere synonym of Echiiumona 

 incrustans. 



R.N. 496 (s. 10, 8 £; "scarlet vermilion"). 



^.J/. sp. 46 {^' Echiiioiieina i/ia-usfajis, type" Reg. 86-12-15- 

 123); d. 98 iy^'- Pluinohalichondria 7nai)unillata, unregistered"); 

 d. 107 {'' Plumohalichoudria mammillaia^' Reg. 86-12-15-249). 



PliiiiioJialicJiondria arenacea. Carter. 



Plumohalichondria arenacea, Carter, A.IM.N.H., November, 

 1885, p. 367. 



This is probably merely a variety of P. incriistni:s, of very 

 robust habit, with sandy fibre and dermal crust of spined styli. 

 There is no tangible difference in the spiculation of the two. The 

 external form varies from massive to flabellate. 



R.N. 323 (18 f ; "pale grey buff with a red tint on the pro- 

 jecting pax'ts"); 528 (s. 1, 14 f; "between vermilion and 

 ochraceous-rufous "); 675 (s. 5); 682 (s. 5); 708 (s. 5; "flesh to 

 brick red"); 924 (s. 1); 974 (s. 5); 1084 (x A). 



B.M. sp. 67 ( Pliinudialichondria arenacea^ C. type," Reg. 86-12- 

 15-80). 



PlimwJialicliondria purpurea, Carter, 



PluinohalicJiondria pluiiwsa, var. purpurea, Carter, A. IM.N.H., 

 November, 1886, p. 376. 



This is a remarkable species intermediate in characters between 

 Plumohalichondi-ia and Echinodictyum : it ditt'ers from the typical 

 Plujiujhalichondria in that the microscleres are entirely wanting. 

 The name was unfortunately chosen because the purple colour is 

 not characteristic and was probably adventitious in the type. 

 There is only one specimen in the collection and that is extremely 

 irregular, massive, proliferous ; with conulose and rugose l)ut 

 subglabrous surface, and firm, compact texture. The colour in 

 spirit is pale yellowish-grey ; in life it was hw.'S. 



R.N. 759 (s. 1 ; " buftV) 



B.M. sp. 47 {'■^ PluniokaJichoudria plunuisa, var. purpurea. 

 Carter. Type of var.," Reg. 86-12-15-127). 



