454 Mr. EL J. Carter on the 



their way to become enclosed in its vitreous fibre (fig. 7, b). 

 Hence may we not infer that the unique specimen of the latter 

 (which is only half an inch in lengh) is a very young specimen 

 also? 



Farrea facunda, Schmidt (fecundaT). 



For a more detailed description of this species, with illustra- 

 tions, I must refer the reader to Schmidt's 'Atlantisch. 

 Spongienfauna ' (1870), merely observing here, for the sake of 

 comparison, that his figure 10, pi. ii., which represents the 

 skeleton of Farrea facunda of its natural size, is almost iden- 

 tical in size and form with that figured by Mr. Kent as Farrea 

 occa (l. c), with that in my possession from the dredgings of 

 the ' Porcupine ' (No. 3 a, antea), and with that which was ob- 

 tained by Mr. Gassiot from the Caribbean Sea, which I 

 examined microscopically and of which 1 made an accurate 

 drawing. The detail of the skeleton in F. facunda, represented 

 in Schmidt's pi. i. figs. 13-17, also corresponds with that of the 

 specimens mentioned ; while the scopuline form (fig. 18) is 

 often found modified in Aphrocallistes Bocagei (see our PI. XV . 

 fig. 3) ; and his rosette (fig. 19), with the exception of its arms 

 and rays being microspined, together with the spino-capitate 

 spicule (fig. 20), have their analogues in the rosette and um- 

 brella-like spicules respectively of Aulodictyon Woodwardii. 



Farrea occa, Bowerbank. PI. XVI. fig. 4. 



We now come to Farrea occa, which, as before stated, was 

 so called from a fragment of lattice-like vitreous fibre that 

 Prof. Owen found among the detrital mass on which Dr. A. 

 Farre's specimen of Euplectella cucumer (obtained from the 

 Seychelles) had grown. The structure of this fragment Prof. 

 Owen figured (Trans. Linn. Soc. 1857, p. 121), and likened 

 to a " harrow." Subsequently Dr. Bowerbank took a portion 

 from the same detrital mass, and, having subjected it to a higher 

 magnifying-power, thought that he had discovered in it a new 

 kind of vitreous fibre, which was designated " fistulose sili- 

 ceous," applying the name of "Farrea" to the sponge from 

 which it was supposed to have come (Phil. Trans. 1862, 

 p. 758, pi. xxviii. fig. 11). This was repeated in his ' British 

 Spongiadse,' where it was called " simple fistulose siliceous 

 fibre spinulated, from Farrea occa" (vol. i. p. 274, 1864) : 

 occa, a harrow. Finally, in 1869 (P. Z. S. pi. xxiv. fig. 1) a 

 different representation was given, in addition to the foregoing 

 spinulated form, which was also now accompanied by certain 

 minute spicules termed " attenuate stellate retentive spicula " 

 of Farrea occa (op. cit. p. 341) . These two representations, 



