IIYDROIDA. 121 



There are a few gonothecae, which is important, as these have not heen ohserved 

 before in the genus Antennella, They are identical in position and shape with those 

 of Mo)iost<Bchas quadridens, Allman (3), and have the two nematophores at their 

 base. These colonies resemble the branches of M. quadridens exactly, but are on a 

 smaller scale. 



This species was known previously only from the West Indies, between Cuba and 

 Florida. Our Ceylon specimens were found growing on the experimental oyster 

 cages on the Cheval Paar, Gulf of Manaar. 



Antennella allmani, Armstrong (7). 



There is very little of this form. The lateral nematophores are very long, and the 

 hydrothecse have everted rims, as figured by Armstrong (7). 



This is au Indian Ocean species which was dredged oft* Galle and onwards up the 

 west coast of Ceylon. 



Aglaophenia perforata, Allman (2). 



In the absence of corbulee, I cannot be quite sure of the identity of this species, of 

 which a quantity was found growing over Amphipod tubes. It differs from Allman's 

 description in being rather larger, colonies reaching the height of half instead of only 

 quarter of an inch, and in the number of marginal teeth on the hydrothecse not 

 exceeding ten. There is a nematophore at the base of each pinna and one below, on 

 the same internode of the stem as the pinna, which is not described by Allman. 

 Allman's specimens were from the St. Vincent Islands. The Ceylon specimens were 

 found growing on masses of Amphipod tubes and on small pearl oysters in the 

 experimental oyster cages in the Gulf of Manaar. 



Aglaophenia phcenicea, Blsk (10). 



There are a few colonies of this form growing over worm tubes from the north end 

 of the Cheval Paar, 7 to 10 fathoms. It was previously known only from Torres 

 Strait. 



Halicornaria insignis, Allman (1) (Text-fig. 4). 



The species described under this name by Allman was 9 inches in height, 

 unbranched, with a stout, monosiphonic stem, of a dark brown colour ; the hydrocladia 

 paler in colour ; two, opposite, hydrocladia to an internode ; hydrothecse winged and 

 toothed, with a long, curved, mesial nematophore, and two lateral nematophores 

 taller than the hydrothecse. 



The present specimens correspond exactly with this description, but that the 

 colonies are of far greater height, one reaching a size of 15^ inches, spreading from 

 the base in a beautiful fern-like way (see text-fig. 4), and that they are covered with 

 gonothecae. 



There is also one colony of about 9 inches in height, exactly corresponding with 



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