1248 THE VOYAGE OF H.M.S. CHALLENGER. 



Station 188, Arafura Sea, September 10, 1874; depth, 28 fathoms; bottom, green 

 mud. One specimen (mounted). 



Remarks. — Dana's specimens were " from thirty-one fathoms water, in Balabac 



Passage, attached to a Plumularia and a Gorgonia." He gives the colour as "pale 



yellowish." In Mr. Haswell's figures and descriptions of Protella australis I can find 



little to distinguish it from Dana's species, except in " the presence of a pair of short, 



acute, forwardly directed spines on the head." 1 But in the earlier account 2 he says 



" Cephalon armed above with a single short, anteriorly directed spine," and again "the 



cephalic spine is sometimes rudimentary." In the statement that the flagellum of the 



lower antennae " is composed of six articuli," 3 which I have already noticed as contrary 



to the generic character of Protella, there must, I think, be some misapprehension. In 



the original account 4 Mr. Has well only says " flagellum very short." One point, 



however, remains: Mr. Haswell says, "the branchiae are long oval; the corresponding 



appendages are distinct, between a third and a half the length of the branchiae." 5 In 



Dana's figures and in the Challenger specimen the rudimentary peraeopods are much 



longer in proportion to the branchial vesicles than in Mr. Haswell's description of his 



species ; but in Dana's figures the legs are proportionately much larger than in the 



Challenger specimen, so that probably these- appendages are very variable in size within 



the species. The other details given by Mr. Haswell agree so well with Dana's figures 



and with the specimen here described, that they strongly tend to confirm the opinion 



expressed by Mayer 6 that Protella australis is a synonym of Protella gracilis. 



Genus JEginella, Boeck, 1860. 



1843. JEgina, Kr0yer, Naturh. Tidsskr., R. 1, Ed. iv. p. 496. 



1852. „ Dana, U.S. Explor. Exped., vol. xiii. pt. ii. pp. 807, 822. 



1854. ,, Stimpson, Marine Invertebrates of Grand Manan, p. 44. 



1855. Caprella, Bell and Westwood, The Last of the Arctic Voyages, p. 407. 

 1860. jEgina, Boeck, Forh. ved de Skand. Naturf. 8de M0de, p. 670. 

 1860. JEginella, Boeck, Forh. ved de Skand. Naturf. 8de M0de, p. 670. 



1862. Caprella (pars), Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 353. 



1863. JEginella, M. Sars, Nyt Mag. for Naturvidenskaberne, Bd. xii. Hfte 3, p. 290. 

 1870. JZgina, Boeck, Crust, amph. bor. et arct., p. 190. 



1870. JEginella, Boeck, Crust, amph. bor. et arct., p. 192. 

 1876. JSgina, Boeck, De Skand. og Arkt. Amph., p. 679. 

 1876. Mginella, Boeck, De Skand. ogArkt. Amph., p. 684. 



1 Revision of the Australian Laemodipoda, pp. 5, 6 (sep. copy), pi. xlix. figs. 2-4, Proc. Linn. Soc. N.S. W., vol. ix. 

 pt. iv., 1885. In the Plate the figure of the peraeopod is evidently fig. 5, which is not included in the " Explanation of 

 the Plates " ; fig. 4, which is there said to represent " Pereiopoda of Protella australis," must he a second gnathopod. 



2 Proc. Linn. Soc. N.S. W., vol. iv. p. 276, 1880. » Revision of the Australian Lfemodipoda, p. 6. 

 4 Proc. Linn. Soc. N.S.W., vcl. iv. p. 276. 5 Revision of the Australian Laemodipoda, p. 6. 

 Die Caprelliden, p. 31. 



