454 Mr. H. J. Carter on the 



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

 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 {fecunda ?) . 



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 [I. 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 AphrocaUistes 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), Jiave their analogues in the rosette and um- 

 brella-like spicules respectively oi Aalodictyon Woodwardn. 



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 structui-e 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 

 Spongiada^,' 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 " 

 oi Farrea occa {op. cit. p. 341). These two representations, 



