HYDROZOA, SCYPHOZOA, ACTINOZOA, VERMES WHITELEGQE. 391 



neinatocysts also occur in the thickened entoderm, and zooxan- 

 thellse are here more numerous than in the ectoderm of the filament. 

 The filaments are convoluted below and terminate some distance 

 from the base of the column. 



Gonads. In one of the specimens examined by us ovaries were 

 found as small whitish swellings disposed in irregular longitudinal 

 rows along especially the lower portions of the mesenteries, in the 

 region of the mesenteric filaments. 



In G. mutuki, Haddon and Shackleton record finding ripe sperm 

 cells in the ccelenteron of one individual. 



We have much pleasure in associating this well marked species 

 with the name of our friend Dr. A. Willey, in appreciation of his 

 untiring labours in the South Seas. 



PALYTHOA HOWESII, Haddon and Shackleton. 



Palythoa hoicesii, Haddon and Shackleton, Sci. Trans. R. Dublin 



Soc. (2), iv., 1891, p. 693, pi. lxi.,fig. 13; pi. Ixiii., fig. 8. 



A single example is here referred to this species. Several 

 specimens from Thursday Island are in the Museum collection, 

 with which the Funafuti example has been compared and found 

 to agree in all the external characters. 



The specimen consists of an oblong colony 9 cm. long, 3 cm. 

 wide and 1-4 cm. high, the basal ccenenchyme forms a projecting 

 margin all round the colony, from 2 to 5 mm. wide, and from I 

 to 3 mm. in thickness. The polyps are about 7 mm. in diameter. 

 The capitular ridges number about 28 or 30. 



PALYTHOA KOCHII, Haddon and Shackleton. 



Palythoa kochii, Haddon and Shackleton, Sci. Trans. R. Dublin 

 Soc. (2), iv., 1891, p. 694, pi. Ixi., fig. 12; pi. Ixiii., fig. 9. 



A small specimen agreeing in its general characters wilh 

 examples of this form from Thursday Island. It is a thin incrust- 

 ing colony 6 cm. long, 3'5 cm. wide and having a pretty uniform 

 thickness of 7 mm. The capitular ridges are very variable in 

 number from 15 to 20. The polyps are however much contracted 

 and the ridges more or less indistinct. 



PALYTHOA COESIA, Dana. 



Palythoa cccsia, Dana, U.S. Explor. Exped., Zooph., p. 40, pi. xxx., 

 fig. 3, 3a to 3A; Haddon and Shackleton, Sci. Trans. R. 

 Dublin Soc. (11), iv.. 1891, p. 695, pi. Ixi., fig. 14. 

 Two specimens both more or less biconvex in shape. The 

 larger example is 3 '6 cm. in diameter and 3 cm. in height. Polyps 

 about 15 mm. high and 9 mm. in diameter. The upper surface 

 and tentacles are of a bright reddish maroon colour. The 

 specimens are in formol. 



