284 DR THOMAS SCOTT ON THE 



Eucalanus subtenuis, Giesbrecht. 



1888, Eucalanus subtenuis, Giesb., op. cit., p. 33. 



1892, ,, idem, F. Fl. Neapel, vol. xix. p. 132, pis. xi. and xxxv. 



A few specimens were obtained in samples from Stations 26, 27, and 59, 14 33' N., 

 25 09' W., to 2 30' S., 32 42' W. 



Genus Rhincalanus, Dana, 1852. 

 Rhincalanus gigas, G. S. Brady. 



1883, Rhincalanus gigas, Brady, Report Voy. ''Challenger," vol. viii. p. 42, pi. viii. figs. 1-11. 



1888, nasutus, Giesb., of>. cit., p. 334. 



1902, grandis, Giesb., Exped. Antarct. Beige, "Copepoden," p. 18, pi. i. 



1909, gigas, A. Scott, " Siboga" Expeditie, Monogr. XXJXA, "Copepoda," p. 24. 



This species was obtained in two gatherings one from 200 fathoms, collected 

 28th February 1903 in 69 22' S., 26 36' W., Station 273; the other from 500 

 fathoms, collected 2nd March, also 1903, in 68 40' S., 30 18' W., Station 280. 

 Several specimens were obtained, large and small ; the larger measured fully 8 mm. in 

 length, while the smaller were similar to R. nasutus. 



A careful examination of these Scotia specimens leaves scarcely any doubt in my 

 mind that they all belong to the one species Rhincalanus gigas of BRADY, the only 

 apparent difference between the largest and the smallest specimens being the difference 

 in their size. BRADY'S specimens ranged from 8'5 to 10 mm., while the largest of the 

 Scotia specimens measured fully 8 mm., and ranged from that to specimens no bigger 

 than those found in the North Sea. I am therefore unable to regard Rhincalanus 

 nasutus as anything more than a small variety of R. gigas, while R. grandis is a finer 

 and somewhat larger form of the same species. 



Rhincalanus cornutus, Dana. 



1849, Calanus cornutus, Dana, Proc. Amer. Acad., vol. ii. p. 19. 



1852, Rhincalanus cornutus, Dana, U.S. Explor. Exped., vol. xiii., II., p. 1083, pi. Ixxvi. 



Tolerably frequent in two surface gatherings collected 5th May 1904, Station 477, 

 off Cape Peninsula (34 21' S., 18 29' E.), South Africa. 



Genus Mecynocera, I. C. Thompson, 1888. 



Mecynocera clausi, I. C. Thompson. 

 1888, Mecynocera clausi, I. C. Thompson, Journ. Linn. Soc., "Zool.," vol. xx. p. 150, pi. xi. 



Mecynocera was observed in gatherings from Stations 7, 10, 12, 13, 15, and 28, 

 all in the North Atlantic, between 26 23' N., 20 20' W., and 13 7' N., 25 9' W. 

 I. C. THOMPSON collected his specimens at the Canary Islands, nearly in the same 

 latitude as Station 7, 26 23' N., 20 20' W. 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 530.) 



