6 Porifera. 



Auchenthaler gives some histological details on the cortex of Stelletta grubii 

 0.8. = S. dorsigera 0. S. The swabenartige Bildung of the latter is of uo specific 

 value, as it is by 110 means constant. The anatomy resembles strikingly that of 

 S. normani described by Sollas. Some specimens are strongly pigmeuted, others 

 scarcely at all. In the latter trichodragmata were present. The author believes 

 that the presence of pigment and the absence of trichodragmata are individual, 

 pathological facts, but certainly of no moment for the distinction of species. 



Marenzeller studied original specimens of Schmidt's Stellettae and identifies 

 S. boglicii , dorsigera. anceps and grubii as one and the same species (S. grubii . 

 The spicules vary greatly in shape and size ; trichodragmata may occur, but do 

 not always, thus they are not spicula indicautia (Vosrnaeij . In S. pwnex 0. S. the 

 small ac 1 belong probably to a Reniera, the tr. ac. sp. to a Myxilla; besides 

 these were found spicules of a Suberites. Although Schmidt's specimen is in 

 a very bad state of preservation, M. considers it a true Stelletta with cortex. - 

 Ancorina hispida Buccich belongs to the genus Stelletta and is to be called S. 

 hispida (Buccich) Marenz. The anatomy recalls strongly that of S. grubii O.S. 

 The genus Ancorina of Schmidt would be superfluous, if there were no other cha- 

 racters ; these, however, M. describes in Schmidt's original specimen. Vosmaer's 

 suggestion that si. occur is proved to be right ; on the other hand certain histo- 

 logical details and the occurrence of sanidasters separate the genus from Stelletta. 

 A system of inhalant lacunae, instead of regular canals, conduct the water into 

 the chones. These characters are possessed, not only by Ancorina cerebrum and 

 ci-rnica, but also by Stelletta wageneri O.S. M. identifies these three species and 

 unites them under the name A. cerebrum 0. S. - - Stelletta mucronata 0. S. = S. 

 carbonaria O.S. = Stryphnus mucronatus (O.S.) Soil. - - Stelletta discophora O.S. 

 = S. mamillaris O.S. = Erylus discophorus (O.S.) Soil. 



For the ovum of Plakina see infra, Coeleuterata p 3, Korschelt. 



C. Oligosiliciua. 

 See, supra p 3, Keller. 



(D. Psendotetraxouina.) 



E. Clavulina. 

 See, supra p 3, Hanitsch. 



Leidy gives some notes on the genus Cliona and mentions C. p/iallica n. from 

 Florida. See also Topsent ( 2 ). 



III. Coruacuspongiae. 



A. Halichoudrina. 



See, supra p 3. Hanitsch, p 3, Keller, and, p 5, Vosmaer ( 2 ). 



Topsent ( 3 ) describes a new species of Dendoryx and gives some notes on this 

 genus. - - For Spongilla see also Maas. supra, p 5, Girod, Potts, Richard, and 

 Schneider, for the ovum of Spongilla infra. Coelenterates p 3, Korschelt. 



B. Ceratina. 



See, supra p 3, Keller, p 4, Lendenfeld (V 2 ), P 4 > Haeckel, and, p 5, 

 Carter (). 



Topsent ( 3 ) gives notes on the development of Spongeliafragilis. Ova and 

 embryos are found in July and August (Luc, Channel). The larvae leave the 

 mother towards the end of August. 



Lendenfeld ( 6 , 3 ) describes a quantity of old and new Horny sponges. <f The 



