COPEPODA 



57 



Pacific between 61 N. and 52 N., between 10 S. and 55 S. west of South-America, and 108 L. W. 

 Equator (Giesbrecht 1892) and off California (Esterly 1905). In the North Atlantic it has been 

 recorded on the west side off Woods Hole (Wheeler 1900) and on the east from the Faeroes to Gibraltar. 

 According to Scott (1894) it is fairly common in the Gulf of Guinea as far south as the Congo; 

 Wolf en den shares, probably rightly, the opinion that the species which the mentioned author 

 describes as P. parvus really is Paracalamis aculeatus Giesbr., which represents this species in the 

 South Atlantic (1911, p. 203). In addition to all these localities this species is found in the southern 

 part of the Baltic, the Kattegat and the North Sea. 



1845 47. Calanus minutus n. sp. Kroyer, T. 41 fig. 4. 



1849. Calanus minutus Kr. Kroyer, pp. 543 44, 552. 



1864. Clausia elongata n. sp. Boeck, p. 234. 



1872. Pseudocalanus elongatus Boeck. Boeck, p. 37. 



1892. Boeck. Giesbrecht, pp. 197 200, 



taf. 10. 

 1892. Clausia elongata Boeck. Canu, pp. 170 171; pi. II, figs. 



II3- 



1897. Pseudocalanus elongatus Boeck. Vanhoffen, p. 278, pi. I, 



fig. 6. 



1898. Giesbrecht & Schmeil, 



p. 28. 



1898. Aurivillius, pp. 69 70. 



1900. G. O. Sars, p. 69. 



1900. major n. sp. G. O. Sars, pp. 69 72, pi. XX. 



1901. elongatus Boeck. Th. & A. Scott, p. 339. 



Pseudocalanidae. 



to. Pseudocalanus minutus Kroyer. 

 (Plate I fig. 8; text-figs. 13 a f and 143 c). 



1903 



1902. 



1902. 

 1902. 

 1903. 



1903. 



1903. 



Mrazek, pp. 507508, 



figs. 5-6. 

 Th. Scott, p. 450. 

 Wolfenden, p. 361. 

 Norman, p. 135. 



I. C. Thompson, p. 16. 

 G. O. Sars, pp. 20 21, 



pis X XL 



gracilis n. sp. G. O. Sars, pp. 154155, 

 pi. I (Suppl.). 



Pseudocalanus elongatus Boeck. Jensen, Johansen, Le- 



vinsen, p. 304, tabel II. 



1903. J.C. Thompson &A. Scott, 



p. 244. 



1904. Wolfenden, p. in. 



1905. G. O. Sars, p. 3. 



1905. Farran, p. 30. 



1906. Pearson, p. 10. 



1906. Williams, p. 640. 



1907. major G. O. Sars. Koefoed & Damas, p. 407. 



1907. gracilis G. O. Sars. Koefoed&Damas, p. 406. 



1908. major G. O. Sars. v. Bremen, p. 25, fig. 22. 

 1908. elongatus Boeck. v. Bremen, p. 25, fig. 23. 



Farran, p. 28. 

 1910. Oberg, pp. 48-49, 56-57 



taf. I and VI fig. 3. 

 Kraeeft, pp. 67, 77. 79, 

 taf. I figs. 13 21. 



1910. Steuer, p. 22. 



1911. Farran pp.63 65. 

 1913. Stephensen, pp. 71 72, 



pis 45- 

 1913. Stephensen pp. 312 13. 



Synonymy. As Kroyer has described and figured a young male of his species, it is perhaps 

 not so curious that the different authors have not realized that it is identical with Pseudocalanus elon- 

 gatus Boeck. Kroyer's description and figure are however so good, that scarcely any other species from 

 the Arctic Sea has a pernultimate stage to be confounded with it. As I have had the opportunity of 

 examining Kroyer's original specimens, it is quite evident to me, that the two species are identical; 

 the three examined specimens belonged all to the penultimate stage (ic? -f- 2?); they were in the shape 

 of the head most alike Ps. gracilis, and were of middle size. According to the general rules of nomen- 

 clature the name Ps. elongatus ought to be changed to Ps. minutus Kr., if the three forms are referred 

 to a single species. 



The Ingolf-Expedition. III. 4. 



