PORIFERA. III. 



mainly to the cold area, as the localities, as soon as they are deeper than 300 fathoms, show a negative 

 temperature, but it may also go higher up and here occur in water with a positive temperature. 



Remarks about the species of the genera Histoderma, Histodermella, Inflatella 



and Cornulum: 



Of species which belong here, or have been supposed to belong here, there are at present 

 described the following: 



1874. Histoderma appendiculatnm Cart, (cited above) . . Tylota to strongyla chelae arcuatae sigmata. 



1875. Desmacidon physa O. Schmidt (cited above). . . . Strongyla -- chelae arcuatae - - trichodragmata. 



1875. Inflatella pellicula O. Schmidt (cited above). . . . Strongyla. 



1876. Halichondria phlyctenodes Cart (Ann. Mag. Nat. 



Hist-4, XVIII,3i4, Pl.XIII, fig. 17, PI. XV, fig. 35) Tornota -- chelae arcuatae -- sigmata. 

 1876. Cornulum textile Cart, (cited above) Strongyla with spinulous ends chelae pal- 



matae -- toxa. 

 1883. Phloeodictyon singaporense Cart. (Ann. Mag. Nat. 



Hist 5, XII, 326, PI. XIII, fig. 17 a b) Oxea -- short strongyla -- chelae palmatae. 



1885. Siderodcrma navicelligeruni Ridley and Dendy, 



(Challeng. Rep. XX, Monaxonida, 115, PI. VIII, 



fig. 9, PI. IX, figs. 5, 89) . . Tylota - - small peculiar chelae - - sigmata of 



two sizes trichodragmata. 



1886. Histioderma verrucosum Cart. (Ann. Mag. Nat. 



Hist. 5, XVIII, 452) Tylostrongyla -- chelae arcuatae -- sigmata. 



1886. Histioderma polymasteides Cart. (Ann. Mag. Nat. 



Hist. 5, XVIII, 453) Tylota to tylotornota - - chelae arcuatae? 



1886. Pseudohalichondria clavilobata Cart (Ann. Mag. 



Nat. Hist. 5, XVIII, 454). . . . Tylotornota -- chelae arcuatae, curious, spined. 



1887. Cornulum ascidioides Frstdt. (cited above) = Histoderma physa. 



1887. Cornulum cnteromorphoides Frstdt (Vega Exp. 



vetensk. Jakttag. 447, PI. 25, figs. 3-6, PI. 29, 



fig. 22) se below. 



1888. Sideroderma Zitteli Lendenf. (The Austral. Mus. 



Descrip. Catal. of Sponges, 211) Styli -- oxea -- chelae -- rhaphides. 



1892. Joyeuxia viridis Tops, (cited above) Strongyla. 



1903. Histoderma natalense Kirkpatrick, (Marine 



Invertebr. in South Africa, III, 250, PI. V, 



fig. 17, PI. VI, figs. 18 a e) Tylota -- acanthoxea -- chelse arcuatas - - sig- 

 mata - - trichodragmata - - curious spined 



bodies (transformed chelae? or forcipes?). 



1904. Joyeuxia tubtilosa Tops. (Resultats des camp. sc. 



du Prince de Monaco, Fasc. XXV, 206, PL V, 



fig. 5, PL XIV, fig. 16) Strongyla. 



The Ingotf-Expcdition. VI. \ A 



