364 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



7 GECARCOIDEA LALANDII Milne Edwards. 



Plate IGO, figs. 7 and 8. 



Oecarcoidea lalandii Milne Edwatids, Hist. Nat. Crust, vol. 2, 1S37, p. 25, 



(type-locality, Brazil; type destroyed). — Ortmann, Zool. Jahrb., Syst, 



vol. 7, 1S93. p. 73S.— Calman, Proc. Zool. Soc. London, 1909, p. 710. 

 Pelociircinus hilandci Milne Edwards, Ann. Sci. Nat., ser. 3, Zool., vol. 20, 



1S.")3, p. 203; Arch. Mus. Hist. Nat. Paris, vol. 7, 1S54, p. 183, pi. 15, 



figs. 2, 2a. 

 HyUrocarcinus Immei Wood-Mason, Journ. Asiat. Soc. Bengal, vol. 42. pt. 2, 



1873, p. 200, pis. 15 and 16 (type-locality, Nlcobar; type in Indian 



Mus.). 

 Limnocarcimis intermedius de Man, Notes Leyden Mus., vol. 1, 1879, 



p. Co (type-locality, near the bay of Gorontalo, Celebes; type in Leyden 



Mus.). 

 Hylaocarcimis natalis Pocock, Proc. Zool. Soc. London, 1888, p. 561 (type- 

 locality, Christmas Island; type in Brit. Mus.). 

 Pelocarcinus marchci A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat. 



Paris, ser. 3, vol. 2, 1S90, p. 173. pi. 12 (type-locality, Philippines: ile 



dcs Dcnx-Sceurs ; type in Paris Mus.). 

 Pelocarcinus cailloti A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat. Paris, 



ser. 3, vol. 2, 1890, p. 174, pi. 13 (type-locality, Loyalty Islands; type in 



Paris Mus.). 

 Pelocarcinus huinei Alcock, Journ. Asiat. Soc. Bengal, vol. (59, 1900, p. 449. 

 Gecarcinus Uiaostomus Andrews, Monogr. Christmas Island, 1900, p. 163; 



not G. lagostoma Milne Edwards. 



Diagnosis. — Fronto-orbital border less than half width of carapace. 

 Buccal cavern rhomboidal. Outer maxillipeds gaping; merus dis- 

 tally excavate, bearing at its summit the pnlpus exposed to view; 

 exognath partly concealed and without flagellum. 



Description. — Median furrow very pronounced. Branchial regions 

 xery large and very swollen. The cardiac lobe is prolonged strongly 

 backward between the bases of the posterior feet. 



Front small, strongly curved downward, and terminated by a 

 prominent and straight border. 



Antcnnular cavities almost circular, small and plainly visible; sep- 

 tum between them narrow. Antennae almost rudimentary and 

 wholly under the front. 



Orbits small, oval, deep, bordered by a small sharp rim; upper 

 margin a little sinuous and directed forward and outward, outer 

 angle not prominent; outer suborbital lobe forms a rounded tooth 

 which joins the angle of the front in such a way as to exclude the 

 antennae from the orbit. 



Chelipeds strong and almost equal; the arms surpass much the 

 lateral border of the carapace and their anterior border is roughened 

 with obtuse denticles; hands rounded; fingers elongate, cylindrical 

 and almost meeting. 



