524 BEY. T. B. R. STEBBTtfG Oy CRUSTACEANS [M av 22, 



superior margin, and receives the eyes and the antennae without 

 intermediate division in front or the epistome, although that is 

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

 opinion to the genus HaUcarcinus." 



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

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

 H;i,aenosoma and HaUcarcinus, with the epistome less prominent, 

 from Elamena and Triqonoplax, 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 HaUcarcinus 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. ^ 



Halica.eci:nt t s planatus (Fabricius). (Plate XXXVI b.) 



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



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



1783. Cancer planatus, Herbst, Krabben und Krebse, Heft. 2-5, 

 p. 142. 



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



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



1840. HaUcarcinus planatus, White, Ann. Mag. Nat. Hist. 

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



1852. HaUcarcinus p>lanatus, Dana, U.S. Expl. Exp. vol. xiii., 

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



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

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



1868. HaUcarcinus planatus, Heller, Seise der Novara, Crust. 

 p. 66. 



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

 vol. xxvii. p. 492. i 



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

 p. 49. 



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

 Hist. Kerguelen, p. 57. 



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

 Magenta, p. 176, pi. 10. figs. 4 a-f, pi. II. 1 figs. 2, 2 a [?]. 



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

 p. 201. 



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

 straca, p. 114. 



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

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

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

 fig. 5 ; but Tav. xi. has " Pig. 1. \ 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 «, 3 >>, 3 c, 3 d, '■> e " for Hymenosoma Imve. 



