ISODIOTXA. 119 



10. IsoDioTTA iNDisTiNOTA, Bow., u, 290 ; III, 131 and 

 356, PI. LI, figs 1—4. 



Habitat. — Dredged in about five fathoms near the 

 mouth of "Westport Bay. Among Dr. Bowerbank's 

 notes are the following on two of the examples pro- 

 cured by me from this locality (N.). 



" A fine mass of this sponge, about the size of half 

 a large-sized orange, based on a rolled stone. In form 

 and general surface characters it differs very consider- 

 ably from either of the types figured in Plate LI, vol. 

 iii, ' Mon. Brit. Spongiadse.' The mass was soft and 

 flesh-like and the oscula were large simple orifices. In 

 the peculiarities of its dermal structures, and in all of 

 its anatomical details, it is quite in accordance with 

 those of the type-specimens, and, like them, it strongly 

 illustrates the inutility of external characters as specific 

 distinctions. Numerous specimens of Porcellana longi- 

 cornis were nestling within its large internal cavities. 

 Another specimen in Mr. Norman's collection from the 

 same locality is an irregular mass of a very dark dull 

 purple or brown colour, it was two and a half inches in 

 length, one and three quarters inch in breadth and 

 thickness. It is noteworthy as being the largest 

 specimen of the species that I have yet seen." 



11. IsoDiCTYA SIMPLEX, £ow,, II, 294; III, 107, 128, 

 PI. XLIV, fig 6, and PL L, fig. 18. 



12. ISODICTTA POCILLUM, BoW., II, 306; III, PI. LIII, 



figs. 4 — 6. 



