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Strassen, Zur O., 1902. Vber die Gattimg Arcturus und die Arcturiden der deutschen Tiefsee-Expedition. Zool. Anz. vol. xxv, 



pp. 682-9, figs- '~4- 

 Studer, Th., 1882. Ueber eine neue Art Arcturus, und eine neue Gattung der Idotheiden. Sitz. Ges. Naturf. Fr. Berlin, 



pp. 56-8. 



1884. Isopoden, gesammelt wdhrend der Reise S.M.S. 'Gazelle' urn die Erde 1874-1876. Abh. K. Akad. Wiss. 1883, 



pp. 12-17, pi. I (published in Berlin, 1884). 

 Tait, J., 1 917. Experiments and observations on Crustacea. Part IV. Some structural features pertaining to Glyptonotus. 



Proc. Roy. Soc. Edinb. vol. xxxvii, 1916-17. 

 Tattersall, W. M., 1904. The marine fauna of the coast of Ireland. Ft. V. Isopoda. Fisheries, Ireland, Sci. Invest. 1904, 



vol. II (1905). 



1911. Die nordischen Isopoden. Nordisches Plankton, Lief, ii, vol. vi, pp. 181-314. 



1921. Tanaidacea and Isopoda. British Antarctic 'Terra Nova' Expedition 1910, Natural History Report. Zool. vol. ill, 



no. 8, Crustacea, pt. VI. 

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1904. A new family of Crustacea, Isopoda. Ann. Mag. Nat. Hist. (7), vol. xiv, pp. 66-9, pi. i. 



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SUPPLEMENT TO ISOPOD CRUSTACEA, PART I: 

 THE FAMILY SEROLIDAE (Text-figs. 23-29) 

 Since the publication of the Discovery Report, The Family Serolidae, vol. vii, 1933, pp. 253-362, 

 three new species have been erected. One, Serolis johnstoni Hale, was collected by the B.A.N.Z. 

 Antarctic Research Expedition, 1929-31, and is described in volume vi of the reports (Hale, 1952, 

 pp. 32-5); the other two, S. acuminata sp.n. and S. ovata sp.n., occurred amongst the specimens 

 collected by R.R.S. 'Discovery H' between 1928 and 1937 and are described below. The type 

 specimens of S. acuminata and S. ovata are deposited in the British Museum (Nat. Hist.). 



According to Hale (1952, p. 35), S. johnstoni comes nearest to S. gerlachei Monod (1925, p. 299 

 and 1926, p. 36, figs. 35-7), but the latter differs in having '(i) no transverse lateral ridges on the 

 dorsum of second peraeon somite ; (2) no median dorsal spine at the hinder margin of the first two 

 free peraeon somites; (3) the coxal plates of the seventh peraeon somite shorter; (4) an additional 

 longitudinal carina on each side of the median carina of the telsonic somite; (5) a small jointlet at 

 the distal end of the third joint of the palp of the maxilliped; (6) the posterior spines on inner edge 

 of the propodus of the first peraeopod broader' (cf. Hale, 1952, p. 33, fig. 4 sp. and Monod, 1926, 

 fig. 36c). 



In S. johnstoni the coxal plates of the seventh thoracic somite are figured by Hale (fig. 4, pin. S) 

 as being incomplete (i.e. broken) in the adult male, but are shown complete on one side of a young 

 male (fig. 4, juv. c?) and extending back beyond the tips of the pleural plates of the second and third 

 abdominal segments. If Hale's figure of the adult male is correct, the broken part of the coxal plate 

 must have been very delicate. Presumably, when complete it extends backwards over the pleural 

 plates as far as in the young specimen, for I know of no example in which the young differ from the 

 adult in this respect. 



Hale states on p. 32 that the pleural plates of the second abdominal segment are produced beyond 

 those of the third; this is shown in his figure of the aduh male, whereas in his figure of the young male 

 the plates of the third segment are shown as extending beyond those of the second. Normally, the 

 comparative lengths of these plates do not change with age, so that the arrangement shown in the 

 figure of the young male is either abnormal or represented incorrectly. 



