SPONGES. 



A, Thenea wallicliii a Choristid Tetractinellid (After Thomson) ; B, Chondrocladia virgata a Desmacidine Mouaxonid (After 

 Thomson) ; C, Askonema setabalense a Lyssakine Hexactinellid (After Thomson) ; r>, Kossella velata a Lyssakine 

 Hexactinellid (After Thomson) ; E, Luffaria archeri a Ceratine Cerospongia (After Higgin) ; F, Ascandra sertularia an 

 Ascon Calcisponge (After Haeckel) ; G, Sycetta primitiva a Sycon Calcisponge (After Haeckel) ; H, Sycortis levigata 

 a Sycon Calcisponge (After Haeckel); i, Sycometra ciliata a Sycon Calcisponge (After Haeckel); K, Trichostemma 

 hemisphericum a ^Taerite Monaxonid (After G. 0. Sars) ; L, Ditto, from the side ; M, Cladorhiza abyssicola a Desmacidine 

 Monaxonid (After G. 0. Sars). Figs. F, G, I, are magnified ; all the rest reduced in size. 



71 



