Classification of the Spongida. 191 



Key to the foregoing Classification of the Spongida*. 

 Class SPONGIDA, Huxley. 



Order I. CAI£NOSA. 



Family 1. Halisarcida. 



Halisarca Dujardinii, Johnston, British Sponges, 1842, p. 192 ; Ann. & 



Mag. Nat. Hist. 1873, vol. xii. p. 25. 

 H. lobuhiris, Schmidt, Spong. adriat. Meeres, 1862, p. 80 ; Ann. & Mag. 



Nat. Hist. 1874, vol. xiii. p. 433. 



Family 2. Gumminida. 



Chonclrilla nucula, Sdt. Spong. adriat. Meeres, p. 39. 



Corticium candelabrum, Sdt. ib. p. 42. 



C. australiensis, Carter, Ann. & Mag. Nat. Hist. 1873, vol. xii. p. 23, 



pi. i. fig. 12. 

 C. abyssi, Carter, ib. p. 18, pi. i. fig. 1. 



Order II. CERATINA. 



Family 1. Luffarida. 



One Group only. 



Luffaria, Duchassaing de Fouhressin et G. Michelotti, ' Spong. de la 

 Mer Caraibe,' Harlem, 1864, 4to, p. 59 ; Natuurk. Verh. Holland. 

 Maat. Wet. te Harlem, vol. xxi. 1864. 



L. JistulariSy D. et M. op. tit. p. (£),= Spon</ia Jidularis, Esper, 1794, 

 pis. xx. & xxi.,= Verongia, Bowerbank, 1866, Monograph of British 

 Spongiadse (Bay Soc. pub.), vol. ii. p. 15, vol. i. pi. xii. fig. 266 ; also 

 'Annals,' 1845, vol. xvi. p. 403, pi. xiii. fig. 7. See remarks on, 

 'Annals,' 1872, vol. x. p. 102. 



L. ramosa, C. MS. See Part III. (A large species with solid branches.) 



L. sessilis, C. MS. Ib. (A sessile species.) 



Family 2. Aplysinida. 



One Group only. 



Aplysina a'eroplioba, Nardo ap. Sdt. op. tit. p. 25, Taf. iii. fig. 2. 

 A. camosa, Sdt. ib. p. 26, Taf. iii. fig. 3. 



A. corneostellata, C. Annals, 1872, vol. x. p. 105, pi. vii., ?=DarurineUa 

 atirea, Archiv f. mikroskop. Anat. 1865, p. 344, Taf. xxi. 



Family 3. Pseudocebatida. 



One Group only. 



Ianthella, Gray, Proc. Zool. Soc. Lond. July 1869, p. 49, = Spongia Jlabel- 

 liformis, Esper, Taf. xiii. &c. 



* One or two species of each family and group respectively will be 

 here inserted for illustration, where any have been described ; but where 

 none have been described, reference will be made to species which will 

 be described in the Third Part of this communication. 



14* 



