OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 271 



considerably in its expansion and denticulation. Among the specimens' obtained by 

 the Scotia the largest, a male taken on the shore, Houtjes Bay, May 19, 1904, has 

 a carapace 20 mm. long by 15 mm. broad ; the next largest, a female, has the cara- 

 pace 19 mm. in length, including the rostrum as in the other instance, with a breadth 

 of 15 mm. at the widest part of the granulated rim ; but, in both examples, if the 

 bulging lateral parts are included, the apparent breadth becomes at least equal to the 

 length, in good accord with the specific name orbicularis. The short narrow pleon of 

 the male is in striking contrast to the greatly expanded pleon of the female. 



Localities. — Entrance to Saldanha Bay, depth 25 fathoms, May 21, 1914 ; Station 

 483. Within Saldanha Bay on May 19, on the shore, and in depths of 5 and 8 to 10 

 fathoms, and the largest female specimen on May 20 ; Station 482. 



Genus Halicarcinus, White. 



1846. Halicarcinus, White, Ann. Nat. Hist., ser. 1, vol. xviii. p. 178. 



1900. „ Stebbing, Pr. Zool. Soc. London, p. 521. 



1907. ,, Stimpson, Smithson. Misc. Coll., vol. xlix. p. 145. 



Further references to the genus will be deducible from the synonymy of the 

 following species : — 



Halicarcinus planatus (Fabricius). 



1775. Cancer planatus, Fabricius, Syst. Ent., p. 403. 



1846. Halicarcinus planatus, White, Ann. Nat. Hist., ser. 1, vol. xviii. p. 178., pi. ii. fig. 1. 



1891. „ „ Mocquard, A. Milne-Edwards, Miss. Cap Horn, "Crust.," p. 27. 



1893. ,, ,, Ortmann, Zool. Jahrb., vol. vii. p. 31. 



1900. ,, ,, Stebbing, Pr. Zool. Soc. London, p. 524, pi. xxxvi.B. 



1902. „ „ Hodgson, " Southern Cross " Exp., p. 231. 



1903. ,, ,, Ortmann, Princeton Exp. Patagonia, vol. iii. p. 660. 



1904. „ „ Doflein, Deutsch. Tiefsee-Exp., vol. vi. p. 87. 



1905. ,, ,, Lagerberg, Schwed. Sudpol. Exp., vol. v. part vii. p. 25. 



1909. ,, ,, Chilton, Subantarctic Is. N. Zealand, p. 609. 



1910. ,, „ Eathbun, Pr. U.S. Mus., vol. xxxviii. p. 570. 



Numerous specimens were obtained by the Scotia at the Falkland Islands, in 

 January 1903, in Port Stanley Harbour and in shore pools at Cape Pembroke, and 

 again on January 31, 1904, on the shore at Port William. In this last gathering, as in 

 the earlier one from shore pools, the male specimens were distinguished by the con- 

 siderable size of the chelipeds. A single specimen is labelled November 1903, 

 Macdougal Bay, South Orkneys. 



Tribe OXYSTOMATA. 



1841. Oxystomata, de Haan, Crust. Japonica, decas 5, p. 111. 



Family Calappid^e. 

 1851. Calappidx, Dana, U.S. Expl. Exp., vol. xiii. pp. 390, 393. 



