Rev. T. Ilincks on the Ilydroida, 149 



described by Menef^liini. The calycle is not apprcssed to the 

 shoot, but stands out from it at an angle. 



The female ca])sules are of very large size, either much 

 elongated and rather slender, or of a broader and shorter type 

 (PI. XII. tig. (j) ; but in all cases they present a striking 

 contrast to the males. They are developed in the usual posi- 

 tion at the base of the calycles. 



The sarcothecoi exhibit several varieties of form. The hy- 

 drothecal pair are pedunculate ; the one below the calycle is 

 ineurvate and projects from the stem like a bracket ; the two 

 above the calycle consist of an elongate, stem-like j)ortion, ta- 

 pering otf to a jwint below, which su])ports a minute cup ; they 

 are directed upwards parallel to the shoot. These organs 

 supply good diagnostic characters. 



Suborder ATHECATA, Ilincks. 



Family Atractylidse. 



? Genus Perigonimus, Sars. 



^ Perigonimxis nutans, n. sp. (PI. XII. fig. 1.) 



Stems erect, simple, smooth, slightly tapering downwards, 

 not dilated above ; ^>o/j//)**/e large, clavate, terminating above 

 in a short proboscis, and borne on a neck-like extension of the 

 coenosarc, which rises considerably above the polypary, white, 

 with a slight tinge of light yellowish colour ; tentacles 8, four 

 erect and four depressed ; body of the polypite frequently bent 

 downwards, so as to droop on one side : gonophores unknown. 



In the absence of the reproductive bodies, this very graceful 

 species can only be referred provisionally to the genus Perigo- 

 nimus. So far as the trophosome is concerned, it is a well- 

 marked form. The very delicate transparent polypaiy only 

 extends to the base of a neck-like prolongation of the coenosarc, 

 which enlarges gradually into the club-shaped body of the 

 polypite. This neck-like portion is very flexible ; and the po- 

 lypite commonly droops to one side, assuming a graceful pen- 

 Jent posture. It has no power of retracting itself in any degree 

 within the polypary, which exhibits no trace of a cup-like di- 

 latation above. The cndodcrm is opaque white, with a slight 

 yellowish tinge, and the ectoderm transparent. The arms are 

 roughened as usual, and arranged in two sets of four, one 

 carried erect and the other everted. There is no wrinkling or an- 

 nulation of the polypary, which forms a very delicate and filmy 



