THE PORIFERA. 75 



Mar, and since that time several other species have been 

 described. The different varieties of Carnosa now known, 

 including both aspiculous and spiculous species, have lately 

 been grouped by Mr. H. J. Carter, F.R.S., in two families — 

 Halisarcida and Gumminida {Annals and Mag, Nat. Hist., 

 October, 1881), embracing in all twenty-five species." 



The specimens of H. diijardinii found at Holyhead in 

 March, 1873, contained ova in the first stage of development 

 only, that is before any duplicate subdivision had taken 

 place, but those obtained by Mr. Carter in July and August 

 the following year contained ova as well as embryos in 

 every stage of development. The Port Erin examples also, 

 gathered in July and August last year, contained embryos in 

 the later stages of development. 



Dr. Bowerbank would not believe in the existence of 

 sponges without any spicules, and assumed that Dr. 

 Johnston was mistaken in not finding spicules in the sponge 

 he described. He has figured a thin coating sponge 

 amongst his Hymeniacidons as Hymeniacidon dujardinii, 

 under the impression that this must have been the species 

 Dr. Johnston had described (Mon. Brit. Spon., vol. iii, 

 pi. 38, fig. 1 to4).f 



L. M. B. C, No. 85. 1., near low-water mark, Bay-ny- 

 Carrickey, between Port St. Mary and Poyllvaaish, Isle of 

 Man, Aug. 8., 1885 ; from Laminar ia roots on shore between 

 Port St. Mary and Spanish Head, Isle of Man, Aug. 13, 

 1885; in rock-pools, near Port Erin, Isle of Man, Aug., 

 1885. 



L. F. M., No. 22. 4. 74, 3. Collected at Holyhead. 



* See also Carter's papers in 1874 in Annals and Mag. Nat. Hist., 

 "On the Spongozoa of Halisarca dujardinii,*' and "On the Ilalisarca 

 lohularis,*' also '' Development of Marine Sponges," &c.. &c., 1874. 



i For excellent work on Halisarca, with beautiful and faithful plates, see 

 the papers by F. E. Schultze in Zeitschrift f. iciss. Zoologie, 1877, Bd. 

 xxviii, and 1879, Bd. xxix. 



