264 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
XXXII. 
NOTES ON RHINCALANUS GIGAS, BRADY, 
AND -ECTINOSOMA ATLANTICUM, BRADY 
AND ROBERTSON. 
BY THOMAS SCOTT, F.L.S., NATURALIST TO THE FISHERY 
BOARD FOR SCOTLAND. 
[Read 25th November, 1890.] 
Rhincalanus gigas was first observed by my son 
(Andrew Scott) when looking over ‘some tow-net 
material collected at Orkney in 1889. He drew my 
attention to two specimens, but I laid them aside 
with the intention of examining them at my leisure, 
and they were forgotten for a considerable time. 
During the early part of the present year, I was 
examining some tow-nettings collected about 22 
miles south-east of Montrose in the beginning of 
February, when another example was obtained. I 
thereafter submitted specimens to Professor G. S. 
Brady, F.R.S., who identified them as Rhincalanus — 
gigas, Brady. He stated at the same time that he- 
had some doubt as to Rh. gigas being really distinct 
from Rh. cornutus, Dana. Rhincalanus has been 
recorded from various places, but has not, so far as 
I know, been previously observed in British waters. 
It is fully described in the Report on the Challenger 
Copepoda. 
Ectinosoma atlanticum was first described, andes 
the generic name of Microstella, from specimens 
collected by Mr. E. C. Davidson in the open sea to 
the West of Ireland (see Mon. Brit. Copep.). It is - 
an exceedingly small species. I have not yet had 
time to measure the dimensions of any of the 
specimens, but Dr. Brady gives jo of an inch as 
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