184 M. E. riiickers Prodromtts of 



Genus 21. *1Sycidium, iiov. gen. 

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

 ■without peristomial crown. Stomachal cavities of the persons 

 simple, not chambered. Skeleton as in Sycarium. Two 

 species. 



95. S. geJatinosum^W. [AlcyonceUum gelatinosum ^VAimw .) . 



Habitat? (Quoy & Gaimard). 



96. */S^. comj>ressutii, IL {Grantia compressa^ J., var. c). 



British coasts ; Norway. 



Genus 22. *Sycodi:xdrum, 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. */S'. ramosum, H. Heligoland (H,). 

 dS.'^S. 2)i'ocunihens, H. Australia. 



Genus 23. *ARTYNiUAr, nov. gen. 

 Got. char. j\Iouth-opcnings simple, without proboscis or 

 peristomial crown. Stomachal cavities of the persons cham- 

 bered, traversed by irregular partitions. Skeleton as in Syca- 

 rium. One species. 



99. A. comjjressum, Gray {Grantia coinpressa, J., var. d). 



Norway. 



Genus 24. Aphroceras, Gray. 

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

 without peristomial crown. Stomachal cavities of the persons 

 chambered, traversed by iiTCgular partitions. Skeleton con- 

 sisting of simple fusiform spicules, Avhich 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 YIIT. Sycothamnida. 



Genus 25. *Sycotiiamnu8, nov. gen. 

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

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

 boscis or peristomial crown. One species. 



101. '''S.fruticosus, H. Red Sea (Siemens). 



I 



