190 Prodromus of a System of the Calcareous Sponges. 



132. */S'. compressa^ H. Norway. (The stock, in its most 



highly developed form, bears united forms of eight 



genera, namely : — 1, Sycarium ; 2, Artynas ; 3, 8y- 



cidium ; 4, Astynium ; 5, Sycocystis ; 6, Atiynella ; 



- : 7, Sycophyllum ; 8, Artynophyllum.) 



Synoptical Tahle of the Families of Calcispongise, with especial 

 reference to the conditions of individuality. 



I. Monosyca. 



Calcareous sponge one 

 person with one 

 mouth-opening. 



II. Polysyca. 



Calcareous sponge a 

 stock with many 

 mouth-openings. 



( Stomach-wall 



solid, without cutaneous pores 



and without parietal canals... 1. Prosi/ckla. 



with simple cutaneous pores ... 2. Ohjnthida. 



with regular, radial parietal 



canals 3. St/carida. 



with irregular, branched parie- 

 tal canals 4. Di/ssycida. 



with simple cutaneous pores 

 (stock with developed per- 

 sons) 5. Soleniscida. 



with simple cutaneous pores 

 (stock with rudimentary per- 

 sons) 6. Tarromlda. 



with regular, radial parietal 

 canals 7 



with irregular, branched parietal 

 canals 8 



III. Ccenosyca. 



Calcareous sponge a 

 stock with one 

 mouth-opening. 



IV. Clistosyca. 



Calcai-eous sponge one 

 person without a 

 mouth-opening. 



V. Cophosyca. 



Calcareous sponge a J 

 stock without mouth- | 

 opening. ^^ 



VI. Metrosyca. 



Calcareous sponge a 

 stock composed of 

 persons and stocks 

 of various species 

 and genera. J 



with simple, cutaneous pores . . . 

 witli irregular, branched parie- 

 tal canals 10. 



with simple cutaneous pores ... 11. 

 with regular, radial parietal 



canals 12. 



with irregular, branched parietal 



canals 13. 



Si/codendrida. 



8. Si/cothamnida. 



9. Nardopsida. 

 Canostoinida. 

 Clistolynfhida. 

 Sycocys^ida. 



Lii^ostomida. 

 with simple cutaneous pores ... 14. Sycorrhizida. 

 with regular, radial parietal 



canals 15. Sycophyllida. 



with irregular, branched parietal 



canals 16. Sycolepida. 



with simple cutaneous pores ... 17. Thecometrida. 

 witli regular, radial parietal 



canals 18. Sycometrida. 



Synoptical Table of the Families of Calcispongise, toith especial 



reference to the conditions of canalization. 



1. Aporeuta. "i 



Stomach-wall solid, I Qnc person with one mouth-open- 

 without cutaneou,s Y j ^ Prosynda. 



pores or parietal 

 canals. / 



