REPORT . 



ON THE 



HYDROIDA 



COLLECTED BY 



MR. JAMES HORNELL 



AT 



OKHAMANDAL IN KATTIAWAR IN 1905-6. 



MISS LAURA ROSCOE THORNELY 



[Prefatory Note. — Of the 17 species described below, it is remarkable that 

 whereas six only of these are found among the 43 species in the Ceylon collec- 

 tion described in Herdman's "Ceylon Pearl Oyster Fisheries Report," Pt. II., p. 108, 

 as many as 10 are among the species recorded by Bale from Australian waters. 

 When we add to these the two " Siboga " forms {Plumularia concava and Mono- 

 staechas fischeri var. simplex), the preponderance of Australian and Malayan species 

 is extremely significant, constituting indeed 12 out of the 17 species represented. 



Four of the six species common to Kattiawar and Ceylon are also common 

 to Australia, and it is reasonable to expect that when the Gulf of Mannar hydroid 

 fauna is completely investigated the remaining six species common to Kattiawar 

 and Australia will also be found there. The present hst as it stands comprises 

 the following 10 species recorded for the first time from Indian and Ceylon 

 coasts, viz. : — 



Hebella scandens (Bale). 

 Synthecium maldivense Borradaile. 

 Pasythea quadridentata Ell. & Sol. 

 Thuiaria fenestrata Bale. 

 Monostaechas fischeri var. simplex 



Billard. 



Plumularia badia Kirch. 



,, caliculata Bale. 



„ concava Billard. 



Lytocarpus philippinus Kirch. 

 Halicornaria gracilicaulis (Jaderholm), 



147 



