108 



CEYLON PEARL OYSTER REPORT. 



Most of the specimens in this collection were dredged by Professor Herdman 

 during the cruise of the " Lady Havelock " round Ceylon in February and March, 

 1902, but some were also obtained by the native divers from the pearl banks, or were 

 picked off the experimental cages in which pearl oysters were kept suspended from 

 the ship. 



It is probable that the Ceylon fauna contains many more species of Hydroid 

 Zoophytes, some of which are unknown to science, since there are many small 

 specimens and fragments in the collection which are not large enough or complete 

 enough to be described, but which evidently do not agree with the characters of any 

 known species. 



The following is a list of the species described in this Report. Those marked with 

 a star are, I believe, additions to the recorded fauna of the Indian seas : 



ATHEGATA. 



*Corydendrium chevalense, n. sp. 



Bougainvillia, sp. 

 *Evdendriwm pusillum, von Lendenfeld. 



* Podocoryne dcnhami, n. sp. 

 *Clavactinia gallensis, n. gen. & sp. 

 *Tubularia gracilis, von Lendenfeld. 



THECAPHO-RA. 



Halecium, sp. 

 *H. flexile, Allman. 

 *Clytia geniculates, n. sp. 

 *0belia hyalina, Clarke. 

 *0. australis, von Lendenfeld. 



0. andersoni, Hincks. 



Cam/in a iila rin j a iieeii, Allman. 

 *C. carrugata, n. sp. 

 *3ebella calcarata (A. Agassiz). 

 *Lafoea serrala, Clarke. 

 *Cuspidella costata, Hincks. 

 *Sertularia gracilis, Hassall. 

 *S. ligulata, n. sp. 

 *S. fissa, n. sp. 

 *S. tenuis, Bale. 

 *S. loculosa, Busk. 

 *S. rugo&issima, n. sp. 

 *Diphada mutulata (Busk). 



Scrtularella, sp. 



Thuia,ria, sp. 

 *T. palms, n. sp. 

 * Desinonjplrus pallcensis, n. sp. 

 *Synthecium orthogonia (Busk). 



Pasythea hexodon, Busk. 



Idia pristis, Lamouroux. 

 *Plumularia setaeea, Ellis. 

 *P. buskii, Bale. 



*Monostcechas guadridens (McCrady). 

 *Antennella gracilis, Allman. 



A. allmani, Armstrong. 

 *Aglariphenia perforata, Allman. 

 *A. pluenicea, Busk. 



Halicornaria insignis, Allman. 



H. setosa, Armstrong. 

 *Lytocarpus hornclli, n. sp. 

 *L. fasciculalus, n. sp. 

 *L. phtmosus, n. sp. 



This list shows in all thirty-two species added to the list for the Indian seas in 

 addition to seven previously known and four left specifically undetermined. 



