2 6 PORIFERA. III. 



1905. Hislodrrma vesciculatum Dendy (Rep. of the 

 Pearl Oyster Fisheries of the Gulf of Manaar, 



Part III, 166, PI. XI, figs. 89) Oxea -- strongyla -- chelae palmatae. 



1908. Joycuxia Belli Kirkpatrick, (Nat. Antarct. Exp. 



Nat. Hist IV, 41, PL XVI, figs. 15 a) Strongyla. 



Histodermella Ingolfi mihi Tylota acanthoxea chelae arcuatae sigmata. 



Histodermella coriacea mihi Strongyla with spinulous ends acanthostrongyla. 



Of these species Cornulum ascidioides Frstdt. is shown above to be identical with Histoderma 

 physa O. Schmidt. I have also examined a piece of the type-specimen of Cornulum cnteromorphozdes 

 Frstdt, and this species proved to be identical with - - Myxilla fimbriata Bow., which for the rest 

 may already very well be seen from the description. The specimen, which Fristedt had to examine, 

 was of an elongated shape, and this in connection with the rather strong dermal membrane of this 

 species has led him to refer this typical Myxilla species to Cornulum. Hereafter these two species 

 of Cornulum must be dropped. Sideroderma Zitteli Lendenfeld scarcely belongs to the group of 

 sponges here in question. 



The remaining species will have to be distributed in the four genera treated above, Histoderma, 

 Histodermella, Inftatella and Cornulum. After Carter had established the genus Cornulum with 

 the typical and sole species textile, this genus has hitherto only contained the same species, the two 

 erroneous species of Fristedt excepted. With a generic diagnosis as given above, in which the 

 distinguishing characters are first the palmate chelae, and next the dendritical or reticulate skeleton, 

 formed of strong fibres, two of the above enumerated species, viz. singaporense 1 ) and vesciculatum must 

 belong to this genus, and the genus seems very natural. Histodermella, which I have founded mainly 

 on characters in the spiculation and for which the typical species is Ingolfi, also includes, besides the 

 two species described here, the Histoderma natalense established by Kirkpatrick in 1903. 



The above enumerated species will, according to the facts mentioned, have to be distributed 

 in the following way: 



Histoderma: Histodermella: Inflatella : Cornulum: 



appendiculatum Cart. natalensis Kirkpatr. pellicula O. Schmidt textile Cart. 



physa O. Schmidt Ingolfi mihi mridis Tops. singaporcnse Cart. 



phlyctenodes Cart (vide coriacea mihi tubulosa Tops. -vescic-ulatuin Dendy. 



remark on page 27) Belli Kirkpatr. 



navicelligerum Dendy 

 verrucosum Cart. 

 polymasteides Cart. 

 clamlobatum Cart (belongs 



perhaps not here but 



may be an Esperiopsis] 



Top sent has (I.e. 1904, 198) established a new genus Phlyctacnopora with one species, bistorquis, 

 ') Dendy (19135, 1. c.) has shown, by examination of Carter's type specimen, that the species has chelte. 



