182 M. E. Hackel's Prodromus of 



Subgenus 3. Leucaria. Spicules partly simple (linear), partly 

 triradiate. (The outer parts of the simple spicules pro- 

 ject beyond the outer surface.) 



70. *iy. thamnoideSy H. Norway. 



71. *Z. robusta, H. Naples (H.). 



72. L. Lieberkuhnn, 0. S. Triest (0. S.). 



73. L.FabriciiyO.S. Greenland (0. S.). 



Subgenus 4. Leuceria. Spicules partly triradiate, partly 

 quadriradiate. (The free ray of the quadriradiate spi- 

 cules projects into the stomachal cavity.) 



74. L. botryoxdeSy Bb. [Sp.botryoides^ Ellis). Britain (Bb.). 



75. *Z. Orantiiy H. British coasts. 



76. *iy. Darivinii^ H. British coasts. 



77. *Z. Goethei, H. Naples (H.). 



78. *iy. LamarcJcn, H. Gibraltar (H.). 



79. ^L. Gegenbauriy H. Messina (H.). 



Subgenus 5. Leuciria. Spicules partly simple (linear), partly 

 triradiate, and partly quadriradiate. (The free ray of tlie 

 quadriradiate projects into tlie stomachal cavity, and the 

 outer part of the simple spicules beyond the outer 

 surface.) 



80. L. amoeboides, H. [Grantia botryoides^ Lieberkiihn). 



Heligoland. 



81. *i/. variabilis, H. Norway. 



82. L. contorta, Bb. British coasts (Bb.). 



Subgenus 6. Leucoria. Spicules partly simple (linear), partly 

 biradiate (hook-shaped), partly triradiate, and partly 

 quadriradiate. (The free ray of the quadriradiate spicules 

 projects into the stomachal cavity ; the outer part of the 

 simple and the outer limb of the hook-shaped spicules 

 project beyond the outer surface.) 



83. *L. echitioides, H. Gibraltar (H.). 



Genus 17. *Soleniscus, nov. gen. 



Gen. char. Stomachal cavities and their communicating- 

 tubes chambered, traversed by irregular partitions and divided 

 by them into numerous communicating chambers, in which 

 the embryos are developed (as in Clatlirina). One species. 



84. ^S. locuIo3U3, H. Australia. 



Family VI. Tarromida, II. 



Character. The mature calcareous sponge forms a stock 



