48 AGLAOPHENIA PERPUSILLA. 



tophores two on the axil of each pinna, and one immediately below 

 the pinna in front. 

 Gonosome not known. 



Off Conch Reef, from a depth of 30 fathoms. 



This is a well-marked species. The expanded summit of the hydro- 

 theca and the deep constriction between this and the proximal poi- 

 tion are striking features. No gonosome was present in the specimen) 

 arid it is quite possible that if this were known we should find it 

 necessary to remove the species from Aglaophenia. 



Aglaophenia perpusilla. 



PI XXIX. Figs. 5-7. 



Trophosome. — Hydrocaulus attaining a height of about one fourth of an 

 inch ; stem simple, non-fascicled ; pinnae alternate, each springing from 

 the anterior aspect of an internode in the axil of a strong tooth-like pro- 

 cess, which carries on its proximal side a fixed nematophore, and just below 

 which another strong fixed nematophore also springs from the internode. 

 Hydrothecae deep, slightly Avidening upwards ; margin with about nine 

 strong and deeply cut teeth, the anterior tooth continued into a narrow 

 keel, which runs down the front of the hydrotheca ; intrathecal ridge dis- 

 tinct, horizontal, situated at the junction of the lower and middle third 

 of the hydrotheca. Supracalycine nematophores strong, overtopping the 

 hydrotheca ; mesial nematophore scarcely reaching the intrathecal ridge, 

 adnate as far as its oblique terminal orifice. 



Gonosome not known. 



Dredged off the Quicksands from a depth of 34 fathoms. 



Ar/laophenia perpusilla is the most minute of all the hitherto described 

 species of Aglaophenia, and is further rendered very distinct by certain 

 special characters. The tooth-like processes given off from the anterior 

 side of each internode of the stem have not been found in any other 

 Aglaophenia. These processes appear bifid from the fact of their carrying 

 in front a strong nematophore, while just below this another similar nemato- 

 phore is also borne by the internode. A peculiar feature in the mesial 

 nematophore of the hydrotheca consists in the constriction of its cavity 

 by a process which projects transversely into it from its anterior wall. 



The species occurred sparingly, growing over a seaweed. No gonosome 



