182 M. E. Hilckel's Prodromus of 



Subgenus 3. Leucnria. Spicules ])artly Hiiiiplc (liuear), ])avtly 

 triraJiate. (The outer ])art,s of the simple spicules pro- 

 ject beyond the outer surface.) 



70. *Z. thamnoideSy II. Norway. 



71. *Z. rohusta, II. Naples (II.). 



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



73. L. Fabricu, O. S. Greenland (O. S.). 



Subgenus 4. Leuceria. Spicules partly triradiate, partly 

 quadriradiate. (The free ray of tlie quadriradiate spi- 

 cules projects into the stomachal cavity.) 



74. L. botri/oi'des, Bb. [Sp.hotryoides^ Ellis). Britain (Bb.). 



75. *i/. Orantii, II. British coasts. 



76. ^L. Daincinii, II. British coasts. 



77. *X. Goethei, II. Naples (II.). 



78. *i/. Lamarckn, H. Gibraltar (II.). 



79. *iy. Gegenhauriy H. Messina (H.). 



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

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

 quadriradiate projects into the stomachal cavity, and the 

 outer part of the simjjle spicules beyond the outer 

 surface.) 



80. L. amosboides, H. [Grantia hotryoides^ LieberkUhn). 



Heligoland. 



81. *Z. vanabilin, 11. Norway. 



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



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

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

 quadriradiate. (The free ray of the quadriradiate spicules 

 projects into the stomachal cavity ; tlic outer part of the 

 simple and the outer limb of the hook-shaped spicules 

 project beyond the outer surface.) 



83. *iy. echinoidesy II. Gibraltar (II.). 



Genus 17. *Soleniscus, nov. gen. 



Gen. char. Stomachal cavities and their communicating 

 tubes chambered, traversed by irregular partitions and divided 

 by them into numerous connnunicating chaml^crs, in which 

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



84. *;S'. loculvsus, U. Australia. 



Family VI. Tarromida, II. 

 Character. The mature calcareous sj)onge forms a stock 



