136 BRITISH SPONGIAD.E. 



Schmidt has identified with those found by himself in 

 the Mediterranean and Adriatic Seas. He synony- 

 mises it with his Axinella polypoides (' Spongien- 

 Fauna des Atlantischen Gebietes,' 1870, p. 77). 



40. ISODICTYA GRACILIS, Bov., ii, 331 ; in, PI. LVIIT, 

 figs. 2326. 



to' 



41. ISODICTYA INVALIDA, Bow., in, 289, PI. LXXXV, 



figs. 810. 



Habitat. I procured a massive specimen an inch 

 and a half long, rather more than an inch broad, and 

 three quarters of an inch high, having five or six 

 conspicuous oscular openings, between tidemarks at 

 Westport Bay, Co. Mayo, this being a second locality 

 for the species (N.). 



42. ISODICTYA NOEMANI, Bow., n, 320; in, PI. LVI, 



figs. 15 ; i, PI. XXXVI, fig. 376. 



43. ISODICTYA COEIACEA, Bow., in, 228, PI. LXXVI, 



figs. 712. 



1881 Dirrhopalum coriaceum, Ridley. Lin. Soc. Jour. Zoology, 

 xv, p. 481, PI. xxix, figs. 37. 



* 



44. ISODICTYA HISPIDA, Bow., n. sp., iv, PI. XII, 



figs. 1 5. 



" Sponge massive, sessile; surface even, minutely his- 

 pid. Oscula simple, dispersed. Pores inconspicuous. 

 Dermal membrane abundantly spiculous ; tension 

 spicula acuate, nearly equal in length, but variable in 



