COPEPODA 



X89 



and the East Atlantic, especially with moderate frequency off the mouth of the English Channel, and 

 as it has not been recorded by Farran from the west coast of Ireland, Farran is probably right in 

 regarding it as a member of the Mediterranean fauna in its wider sense (cf. p. 95). 



Scolecithricidae. 



59. Scaphocalanus magnus Th. Scott. 

 (PI. VII figs 8 a— d; PI. VIII figs 6a-g; text-figs 58 a— k.) 



1893. Amallophora magna n. sp. Th. Scott, p. 55, pl.VI figs 5-9. 



1894. Scolecithrix cristata n. sp. Giesbrecht, pp. 252, Taf. II— III. 

 1898. — — Giesbr., Giesbrecht & Schmeil, p. 48. 

 1900. Scaphocalanus acrocephalus n. sp., G. O. Sars, p. 36, pis 



VII -IX. 

 1903. Amallophora magna Scott. G. O. Sars, pp. 51 — 53, pis 



XXXIV— XXXV. 



1903. 9 n ec. d 1 Scolecithrix cristata Giesbr., J. C. Thompson, 



p. 21. 



1904. Amallophora magna Scott. Wolfenden, p. 111. 



1905. Amallophora magna Scott. G. O. Sars, p. 5. 



1905. Scolecithrix cristata Giesbr. Farran, p. 36. 



1906. — magna Scott. Esterly, p. 66, pis 9, 11 — 13. 



1906. Amallophora — — Pearson, p. 17. 



1907. — — Koefoed & Damas, p. 410. 



1908. Scolecithrix — — Farran, pp. 51 — 52. 



1908. — — — v. Bremen, p. 76 fig. 89. 



1909. Scaphocalanus magnus Th. Scott. A. Scott, p. 97. 

 191 1. Amallophora magna Scott. Wolfenden, p. 262. 



1913. — — Stephensen, pp. 313—314. 



Description. f£. Size of specimen from Thor St. 183 was 5-23 mm.; anterior division 4-08 mm. ; 

 urosome 1-15111111. Sars' specimens measured 5 mm., Giesbrect's and Scott's 4-5 and Wolfenden's 

 37 to 4-25 mm. 



The lateral corners of the thorax are triangularly produced and more or less rounded; but the 

 shape is, however, as seen in text-figs 58 a— i, rather variable, and in some specimens rather suddenly 

 produced. The third basipodite of the mandibulae is less elongate than figured by Sars, and has two, 

 not one, setae interiorly; the first inner segment has two terminal setae, and the second has nine. The 

 maxillulae are scarcely different from Sars' figure; the third basipodite has five setae as shown in 

 Giesbrecht's fig. 1 PI. Ill, not 4 as mentioned in the text. The Li 1 bears 10 setae anteriorly and 3 

 posteriorly. The maxillae and maxillipeds scarcely differ from Sars' figures. 



The second pair of legs shows a few features not mentioned in Sars' description. On the anterior 

 surface of the three outer as well as of the three inner segments groups of short teeth are observed; 

 the first inner segment has, as seen in fig. 8 b, a small outer tooth, which was, however, wanting in 

 another specimen. The first outer segment shows also a few spines on the posterior surface. The an- 

 terior surface of the third as well as the fourth foot is, as mentioned by Giesbrecht, covered all over 

 with small teeth. The marginal setae of the second basipodite in the fourth pair of legs are poorly 

 developed or wanting. Glandular pores were not observed, except one in the outer margin of the third 

 outer segment of the first pair of legs. The fifth pair of legs is in most specimens like that figured 

 by Sars, but it is often rather asymmetrical, and the outer seta extends sometimes beyond the end of 

 the segment, and is sometimes much shorter. 



The elevation in front of the labrum, corresponding to the antennal segment, is slightly raised 

 (PL VII fig. 8 a); the labrum proper, which is produced in front as a rounded protuberance; is by an 



