688 Th. Studer: Jahresbericht über die Leistungen in der 



S. tuberculata n. sp. B. 35° ll' N. L. 139° 28' 0. 345 fd. 



S. ahyssicola (Actinia abyssicola Moseley) B. 40° 

 17' N. L. 66° 48' W. 1350 fd. 



Amphianthiis n. g. With a firm wall, which is covered 

 with fine papillae but not divided into t\vo sections by a circular 

 swelling. 



A. hathyhiu7n. B. 35° 41' N. L. 157° 42' 0. 2300 fd. 

 Familie Ilyanthidae Gosse pro parte. 



Hexactiniae having the aboral end of the body rounded; 

 without pedal disk. 



Halcampa Gosse. With elongated, vermiform body; 

 without sharply defined circular muscle; the posterior end may 

 be distended into a vesicle; oesophageal grooves indistinct or 

 wanting. 



H. clavus Quoy. Gain. Kerguelen, Betsy Cove, Christ- 

 mas harbour. 



Tribe IL Paractiniae. 



Actiniaria with septa united in pairs. Septa of each pair 

 fumished with transverse muscular fibres on the sides tumed 

 from one another and with longitudinal muscular fibres on the 

 sides tumed towards one another, excepting the two pairs of 

 directive septa, which are opposite one another and have longi- 

 tudinal muscles on the sides turned from one another, and 

 transverse septa on the sides turned towards one another. 

 Number of the septa not determined by the number six. 

 Mouth fissure shaped, Oesophagus with two oesophageal groo- 

 ves and two oesophageal lappets. 

 Familie Sicyonidae. 



Sessile Paractiniae with tetramerous arrangement of the 

 septa; circular muscle mesodermal; tentacles transformed by 

 retrograde metamorphosis into small knob like stumps. 



Sicyonis n. g. With discoid, flattened bodv, smooth wall 

 and altemating reproductive septa and muscular septa. 



S. crassa. B. 46° 16' S. L. 48° 27' 0. 1600 fd. 

 Familie Polyopidae Heriw. 



Paractiniae without pedal disk, posterior end of the body 

 round and saccular, with aboral opening (?); tentacles trans- 

 formed into stomidia by retrograde metamorphosis. 



Polyopie n. g. With smooth wall, the surface having 

 longitudinal furrows indicating the position of the septa, cir- 

 cular muscle wanting. 



P. striata, B. 33° 31' S. L. 74° 43' W. 2160 fd. 



