and AcapuJco Sjjonges. 355 



in several species, combined with the flesh-spicule that I have 

 termed " sccptrella " {' Annals/ 1879, vol. ili. p. 358, 

 pi. xxix. figs. 13-21), which so often passes into the " spini- 

 spirula," that both forms may sometimes be found together 

 in the same sponge, ex. gr. Latrunculia corticata (' Annals,' 

 1879, vol. iii. pi. xxvii. fig. 1, «, h,c). 



Terpios fugax^ de Fonbr. et Midi. (p. 102, pi. xxiv. fig. 6). 



Laminiform, almost immeasurably thin, spreading over hard 

 objects {Porites) in the manner of paint. Colour copper- 

 green. Surface in form that of the object ovei- which it may 

 be growing. Consistence sarcodic (no fibre), charged with 

 the spicule of the species, together with innumerable globular 

 bodies (? cells), extremely minute and of a copper-green colour. 

 Spicule of one kind only, viz. pin-like, smooth, very thin, 

 slightly curved ; head globular, acuminated terminally, fol- 

 lowed by a thin shaft, which, after a short distance, gradually 

 diminislies to a sharp point, about 70 by g-GOOOth inch in its 

 greatest dimensions (PI. XII. fig. 29), scattered plentifully and 

 irregularly throughout the sarcodic film of which the sponge 

 is composed. Size of the largest specimen about that of the 

 branched one oi Porites furcatns over which it has grown, about 

 3i inches in diameter. 



Hah. Marine. Growing over hard objects. 



Loc. Falmouth Harbour, Antigua. 



Ohs. This appears, from description and illustration, to be 

 Terpiosfugax, De F. et M. ; but, from the form of the spicule 

 not having been given, it is impossible to go beyond the de- 

 scription and representation for identification. 



There is a species which grows on the rocks of this shore 

 (Budleigh Salterton) in small patches, to which I have alluded 

 in my paper on the " Parasites of the Spongida" (' Annals,' 

 1878, vol. ii. p. 164), chiefly to notice the presence of the 

 parasitic oscillatorian [Hypheoth'ix cceruleay Carter) to which 

 it owes its beautiful colour ; but as I have never published 

 any description of the sponge itself, I will now do it under the 

 name of 



Terpios coirulea. 



Laminiform, almost immeasurably thin, spreading in little 

 patches over the surface of the New Ked Sandstone rocks 

 here. Colour cobalt-blue when fresh, fading much on 

 drying, but not disappearing altogether. Consistence sarcodic 

 (no fibre), charged with the spicule of the species, and in- 

 numerable short parasitic oscillatorian filaments [Ilypheothrix 



