REPORT ON THE AMPHIPODA. 729 



1840. Lydanassa (?) ampulla, Milne-Edwards, Hist, des Crust., iii. p. 22. 

 1842. Stegocephaltis inflatus, Kr0yer, Naturh. Tidsskr., B. iv. H. 2, p. 150. 



1845. „ „ Kr0yer, Naturh. Tidsskr., R. 2, B. i. pp. 522-530, t. vii. fi^s. 3a-3(j. 



1846. (?) „ „ Kr0yer, Voy. en Scandinavie, pi. 20, fig. 2, a~t. 

 1852. ,, „ White, Appendix to Sutherland's Journal. 



1855. Stegocephalus ampulla, Bell and Westwood, The Last of the Arctic Voyages, p. 406, 



pi. XXXV. fig. 1. 

 1859. Sfcgocephalus injiatus, Bruzelius, Skand. Amiih. Gammaridea, p. 38. 

 1862. Stegocephalus ampulla, Sp. Bate, Brit. Mus. Catal. Amph. Crust., p. 63, pi. x. fig. 2. 

 1865. „ ,, Goes, Crust. Amph. maris Spetsb. (two forms), p. 5 (521), figs. 8, 9. 



1869. „ „ Norman, Last Report on Dredging among the Shetland Isles, p. 276. 



1870. „ „ Boeck, Crust. Amph. bor. et arct., p. 48. 

 1876. „ „ Boeck, De Skand. og Arkt. Amph., p. 421. 



1886. ,, ,, Koelbel, Crust., Pycn., Arach. von Jan Mayen, p. 5. 



1887. „ ,, Hansen, Dijmphna-Togtets zool.-botan. Udbytte, p. 218, Tab. xxi. 



figs. 10-1 Of. 



Locality. — Station 49, south of Halifax, Nova Scotia, May 20, 1873; lat. 43° 3' N., 

 long. 63° 39' W.; depth, 85 fathoms; bottom, gravel, stones; bottom temperature, 35°. 

 Two specimens, the larger a female, nearly three-quarters of an inch long. Dredged. 

 Colour as in Voy. en Scand., pi. 20, fig. 2. 



RemarTcs. — Commenting on specimens from the Kara Sea, many of which were dis- 

 tinguished for their size, one being 47 mm. long, Dr. Hansen (loc. cit.) observes, "the 

 species is easy to distinguish from the Steg. Kessleri figured by Stuxberg (Vega B. I., 

 p. 713), which last pretty certainly is the same as the 'forma altera' of Stcg. ampidla, 

 established by Goes {Op. cit, p. 521, Fig. 9). Specimens of Steg. amimlla have the 

 fourth pair of side-plates deeper than long, and the fifth perseopods' expanded second 

 joint (first joint, auctorum) ending in a right, or even slightly acute, angle. Young, 

 taken from the pouch of the female and sufliciently developed to leave it, are dis- 

 tinguished by the circumstance that the fifth pereeopods' second joint has its expanded 

 plate prolonged somewhat downwards and evenly rounded, and the side-plates of the 

 third pleon-segment rounded below ; they are, however, easily distinguishable from 

 Steg. christianensis, Boeck, in that the fourth peraeopods' second (Boeck's first) joint 

 is expanded, and from the species described by Sars by the fourth pair of side-plates, 

 which are quite like those of the adult (see above), and by several other points, which 

 are easily seen in Sars' figures." A footnote already quoted (p. 599) explains that Dr. 

 Hansen's specimens ought to have been described as Stegocephalus injiatus, Kr0yer, and 

 that " Stcgocep)halus Kessleri, Stuxberg," is the true synonym of Cancer ampulla, Phipps.' 



^ Since Phipps' specimens (uncialia et biuncialia) were as large as Dr. Hansen's, I do not know why Dr. Hansen refers 

 to the size as a distinction between the two species. Phipps may have had both forms, for his account of the last 

 perffiopods (femora postremi paris postice acuta) scarcely agrees with the figure. In the synonymy given above the 

 references to Kr0yer, Hansen, and Goes (fig. 8) clearly refer to Stegocepludus injiatus; in most of the others the name 

 ampulla has doubtless been used without knowledge of the distinctions which Dr. Hansen draws between the forms 

 ampulla and injiatus. 



(ZOOL. CHALL. EXP. PART LXVII. 1887.) XxX 92 



