148 OKHAMANDAL MARINE ZOOLOGY REPORT— PART II 



Special attention could not be given to the collection of Hydroids during the 

 short period of my stay in Okhamandal, and many small and inconspicuous 

 species undoubtedly were missed. To obtain such forms I know no better way 

 than to suspend, from channel buoys or from a ship's side, wire net cages con- 

 taining oyster shells at a depth of a few feet below the surface. — J. Hornell.] 



HYDEOIDA— SYSTEMATIC LIST. 



1. Hebella scandens (Bale). 



Bale. — " On Some New and Bare Hydroida in the Australian Museum 

 Collection," Proc. Linn. Soc. N.S.W., Ser. 2, Vol. III., 1888, p. 758; Proc. Roy. 

 Soc. Vict., 26 (N.S.), Pt. I., 1913, p. 117. 



Locality : — ^Dwarka, 15-17 fathoms. 



2. Clytia geniculata Thornely. 



Thornely. — " Report on the Hydroida," in " Ceylon Pearl Oyster Fisheries," 

 Pt. II., Suppl. Kept. No. VIII., 1904, p. 112. 

 A very small part of a colony. 

 Locality : — Off Poshetra. 



3. Synthecium orthogonia (Busk). 



Bale.— Op. cit., Proc. Linn. Soc. N.S.W., Ser. 2, Vol. III., 1888, p. 767. 

 The tip of a colony most probably belongs to this species. The hydrothecse 

 on the lower portion of the stem are semi-alternate. 

 Locality : — ^Dwarka. 



4. Synthecium maldivense Borradaile. 



Borradaile. — " Fauna and Geography of the Maldive and Laccadive Archi- 

 pelagoes," Vol. II., Pt. IV., p. 841. 



The fragments belonging to the top portions of colonies of this species do 

 not exceed 1| inch in length. The branches do not show so acute an angle with 

 the stem as in Borradaile's figure, Plate LXIX. Fig. 5a. The description of the 

 hydrothecse corresponds with this specimen ; the membranous hood I at first 

 overlooked, thinking the orifice had two lateral teeth. There are several gonothecse 

 present on stems and branches, mostly protruding from hydrothecee, but some are 

 situated on the stem just below these. The grouping of hydrothecse is remarkable, 

 the upper four being united as in Pasythea. There are usually a semi-alternate 

 pair and one in the axil of a branch to each internode. There are some nodulous 

 internodes as described for Thuiaria fabricii (Levinsen).i There is a general 



1 Nutting, "American Hydroids," 1904, p. 71. 



