524 BET. T. B. B. STEBBTNG OK CBUSTACEANB [May 22, 



superior margin, and receives the eyes and the antennae without 

 intermediate division in front of the epistome, although that is 

 present. This (Halicarclnus ovatus, see p. 173) belongs in our 

 opinion to the genus Halicarcinus." 



The emphasis which Tozzetti lays on the presence of the epi- 

 stome is in criticism of Milne-Edwards, who had distinguished 

 Hymenosoma and Halicarcinus, with the epistome less prominent, 

 from Elamena and Trigonoplax, with the epistome more prominent. 



After prolonged attention to Tozzetti's discussion, I cannot help 

 feeling that he has made out but a feeble case for the generic 

 distinction of his second and third forms, nor can I feel quite 

 certain that his Halicarcinus ovatus is the same as that which I 

 suppose to be Stimpson's. On this and many other points of 

 Australian carcinology, precise and detailed investigations are 

 needed. 



Haltca.bcikus PLAKATTT8 (Fabricius). (Plate XXXVI b.) 



1775. Cancer planatus, Fabricius, Syst. Eut. p. 403, 18. 



1781. Cancer planatus, Fabricius, Spec. Ins. vol. i. p. 499, 19. 



1783. Cancer planatus, Herbst, Krabben undKrebse, Heft. 2-5, 

 p. 142. 



1793. Cancer planatus, Fabricius, Ent. Syst. vol. ii. p. 446. 



1798. Leucosia planata, Fabricius, Suppl. Ent. Syst. p. 350. 



1846. Halicarcinus planatus, White, Ann. Mag. Nat. Hist, 

 ser. 1, vol. xviii. p. 178, pi. 2. fig. 1. 



1852. Halicarcinus planatus, Dana, U.S. Expl. Exp. vol. xiii., 

 Crust, p. 385, pi. 24. figs. 7 a b. 



1853. Halicarcinus planatus, Milne-Edwards, Ann. Sci. Nat. 

 ser. 3, vol. xx. p. 222. 



1868. Halicarcinus planatus, Heller, Reise der Novara, Crust, 

 p. 66. 



1871. Halicarcinus planatus, Cunningham, Tr. Linn. Soc. Lond. 

 vol. xxvii. p. 492. 



1876. Halicarcinus planatus, Miers, Catal. New Zealand Crust, 

 p. 49. 



1876. Halicarcinus planatus, S. I. Smith, Bull. U.S. Mus., Nat. 

 Hist. Kerguelen, p. 57. 



1877. Halicarcinus planatus, Targioni-Tozzetti, Crost. della 

 Magenta, p. 176, pi. 10. figs. 4 a-f, pi. 11. x figs. 2, 2 a [?]. 



1879. Halicarcinus planatus, Miers, Phil. Trans, vol. 168. 

 p. 201. 



1882. Hymenosoma planatum, Haswell, Catal. Australian Malaco- 

 straca, p. 114. 



1 At p. 173 under Halicarcinus ovatus we read " Tav. x. Fig. 5, a-d ; Tar. xi. 

 Fig. 3, 3 a "; on p. 178, under Halicarcinus planatus, " Tav. x. Fig. 4. a-f." Ou 

 p. 255 the explanation of Tav. x. assigns H. planatus to fig. 4, and H. ovatus to 

 fig. 5 ; but Tav. xi. has " Fig. 1, 1 a, 2 a" for H. ovatus with a reference to fig. 4 

 of the preceding plate, •' Fig. 1,2" for H. planatus, with a reference to fig. 5 of 

 the preceding plate, and " Fig. 3, 3 a, 'Ah, 6c, 3d, 3e " for Hymenosoma lave. 



