45fi HYDEOID ZOOPHYTES COLLECTED BY DR WILLEY IN THE SOUTHERN SEAS. 



opposite in all cases, and there are none in the axils of the branches. They are in 

 contact with each other in front, separated behind, and have a horizontal fold crossing 

 the cell as in S. loculosa, Busk. 

 There are no gonothecae. 



Locality. Lifu, Loyalty Islands; littoral. 



Gexus. Pasythea, Lamouroux. 



Pasythea quadridentata, Ellis and Solander. Nat. Hist, of Zoophytes, London, 1786. 

 There are a few fragments of this species. 



Locality. Lifu, Loyalty Islands. 



Family. Plujil'lariidae, Hincks. 

 Genus. Aglaophenia, Lamouroux (in part). 



Aglaophenia hellis, n. sp. 



This -species has almost the exact appearance of Professor AUman's' figure of 

 Aglaophenia Macgillivrayi, Busk (sp.), and most of its details correspond with his 

 description of them, but there are a few marked differences which I think make a 

 separation necessary. 



There is the fascicled stem with opposite pinnae as in A. Macgillivrayi, gi\'ing 

 off secondary alternate pinnae which carry the hydrothecae, and there are branches 

 taking the places of pinnae at irregular intervals and resembling the stem in structure. 

 It is remarkable in this species the thickness of even the pinnae, the hydrothecae 

 bearing pinnae, fomiing merely a feathered line up the middle of a thick " woody " 

 stem, which is .spotted by the lateral communications between its tubes spoken of by 

 Professor Allman" as a characteristic of this gi-oup. 



The hydi'othecae have the same intrathecal ridge as m A. Macgillivrayi, the 

 mesial sarcothecae are adnate for their whole length, the same height as the hydro- 

 thecae, bithalaraic and canaliculate, and the lateral sarcothecae correspond, but I 

 cannot see the intracauline ridges, and the margins of the hydrothecae have a little 

 projecting point on either side. 



The corbula is closed, with about eight series of costae, but there is no spur-like 

 sarcotheca at the base, nor cup at the summit of each costa which give so striking 

 an appearance to Professor Allman's figure of the corbula in A. Macgillivrayi. 



Viewed from the front my corbulae show that the ribs are disjointed in the 

 middle, the two halves rise from different points at their bases and do not therefore 

 meet above. This form would agree with Professor Allman's^ idea that these corbulae 



1 Voyage of the 'Rattlesnake,' Vol. i. 1852, p. 400. 

 - Voyage of H.M.S. Challenger, Pt 1, 1883, p. 5. 

 3 Ibid., Pt. I. p. 11. 



