184 M. E. Hackel's Prodromus of 



Genus 21. *Sycidium, nov. gen. 

 Gen. char. Mouth-openings simple, without proboscis and 

 without peristomial crown. Stomachal cavities of the persons 

 simple, not chambered. Skeleton as in Sycarmm. Two 

 species. 



95. S. gelatinosum,ll. (Alcy o ncellum gelati720su7n, ^lainr.) . 



Habitat ? (Quoy & Gaimard) . 

 96.* 8. compressum, H. [Grantia comjjressa, J., var. c). 

 British coasts ; Norway. 



Genus 22. *Sycodendrum, nov. gen. 

 Gen. char. Mouth-openings without proboscis, with a peri- 

 stomial crown (surrounded by a circlet of freely projecting 

 spicules). Stomachal cavities of the persons simple, not 

 chambered. Two species. 



97. *6^. ramosumj H. Heligoland (H.). 



98. *>S'. procumhens^ H. Australia. 



Genus 23. *Artynium, nov. gen. 

 Gen. char. Mouth-openings simple, without proboscis or 

 peristomial crown. Stomachal cavities of the persons cham- 

 bered, traversed by irregular partitions. Skeleton as in 8yca- 

 rium. One species. 



99. A. compressum, Gray [Grantia compressa, J., var. d). 



Norway. 



Genus 24. Aphroceeas, Gray. 

 Geii. char. Mouth-openings simple, without proboscis and 

 without peristomial crown. Stomachal cavities of the persons 

 chambered, traversed by irregular partitions. Skeleton con- 

 sisting of simple fusiform spicules, which run parallel to the 

 longitudinal axes of the persons and of the branched stem, 

 and, being closely packed together, form a firm external 

 armour round the internal system of radial canals (?). One 

 species. 



100. A. alcicornis, Gray. Hong Kong (Harland). 



Family VIII. Sycothamnida. 



Genus 25. *Sycothamnus, nov. gen. 

 Gen. char. Persons of the stock separated, only connected 

 by their peduncles. Mouth-openings simple, without pro- 

 boscis or peristomial crown. One species. 



lOl.'^'S.fruticosus^ H. Red Sea (Siemens). 



