686 Th. Studer: Jahresbericht über die Leistungen in der 



Familie Paractidae Hertw. 



Hexactiniae, with numerous perfect septa, and with very 

 contractile, moderately long tentacles, which can be completely, 

 covered; circular muscle very strong, mesodermal. 



Par actis Milne Edw. Smooth body surface, without 

 papillae and without marginal spherules; tentacles nearly equal 

 in length and in strength; numerous longitudinal furrows in 

 the wall. 



P. ezcavata n. sp. B. 33° 42' S. Lg. 78° 18' W. 1375 fd. 



Dysactis Milne Edw. Smooth body surface, without, 

 papillae, and without marginal spherules; tentacles very unequal 

 in size, the inner essentially larger than the outer, completely 

 retractile. 



D. crassieornis n. sp. B. 53° 38' S. L. 70° 56' W. 

 10—15 fd. und B. 52° 20' S. L. 68° W. 55 fd. 



D. rhodora Couth. B. 52° 20' S. L. 68° W. 55 fd. 



Tealidium Hertw. Tentacles placed in several rows and of 

 uniform size in the same row, and having the wall covered 

 with fine papillae. 



T. cingulatum n. sp. B, 50° l' S. L. 123° 4' 0. 1800 fd. 



Antholoba Hertw. (Metridium M. Edw. ex parte.) Innume- 

 rable small tentacles, which lie on a swollen thickening of the 

 margin of the disk; margin of the disk lobed as in Metri- 

 dium. 



A. reticulata Couthouy. B. 52° 20' S. L. 68° W. 55 fd. 



Ophiodiscus n. g. Paractidae with a Single Corona of 

 long tentacles which project at the margin of the wall and 

 oral disk und are only furnished with muscles on the upper 

 side; wall smooth, with longitudinal furrows, indicating the 

 insertions of the septa, septa differentiated into muscular septa 

 and reproductive septa. The animals do not appear to draw 

 the oral disk over the mouth though a mesodermal muscle is 

 present. 



0. annulatus n. sp. B. 33° 31' S. L. 74° 43' W. 2160 fd. 



0. sulcatus n. sp. B. 33° 42' S. L. 78° 18' W. 1375 fd. 

 Familie Lipomenidae Hertw, 



Hexactiniae with numerous perfect Septa and with mar- 

 ginal tentacles transformed by retrograde formation into short 

 tubes or into stomidia. 



Polysyphonia n. g. Tentacles transformed by retrograde 

 formation into short tubes with wide terminal mouths ; circular 

 muscle mesodermal, slightly developed. 



F. tuherosa n. sp. B. 34° 7' N. L. 138° 0. 565 fd. 



Polystomidium n. g. Longitudinal furrows and marginal 



