244 CEYLON PEARL OYSTER REPORT. 



Clausocalanus arcuicornis (Dana). 

 Rarer than the preceding species, hut similarly distributed. It occurred at 

 20 stations. 



Pseudocalanus elongatus (Boeck). 



One of the commonest British species ; occurred at 6 stations, extending as far 

 south as the Gulf of Suez. 



.iEtideus armatus, Brady. 



A species widely distributed throughout the Atlantic, Pacific and Indian Oceans, 

 but only taken at 3 stations in this collection, from the Mediterranean to the Gulf 

 of Suez. 



Undeuchseta minor, Giesbr, 



Occurred off Gibraltar, and at 2 stations in the Indian Ocean ; the latter are 

 additions to its hitherto known range. 



Euchirella rostrata (Claus). 

 Occurred twice in the Indian Ocean. 



Euchirella messinensis (Claus). 



Only once taken, off Minikoi, west of Ceylon, thus considerably extending its 

 southern range ; the Mediterranean and the Gulf of Gascony being the only 

 previous records. 



Euchrota marina (Prestand.). 



A common ocean species; occurred at 86 stations, extending throughoiit the 

 entire traverse. 



Euchasta spinosa, Giesbr, 



Found very sparingly off Gibraltar and in the Mediterranean, and again off 

 Ceylon ; not previously reported from the Indian Ocean. 



Euchaeta acuta, Giesbr. 

 Taken at 2 Mediterranean stations, between Messina and Port Said. 



Euchseta concinna, Dana. 

 Occurred at 3 stations in the Bed Sea and at 4 stations round Ceylon. 



Euchseta barbata, Brady. 



Occurred at 2 stations in the Indian Ocean near Ceylon. Known previously only 

 from the Atlantic. 



