2? 



MACRURA ANOMALA. 



By the most recent arrangement these are divided into 

 Fagnridea, Galatheidea, and Hippidea. As Alcock explains in 

 his Catalogue of Indian Deep-Sea Crustacea, p. 204, 1901, they 

 are the Anomala of de Haan and Boas, and differ " from the 

 Anomnra of Alilne-Edwards in the exclusion of the Droiuidae, 

 Homolidac, Raninidac, and Pactolus, and in the inclusion of the 

 Galatheidae: from the Anomowa of Dana in the exclusion of the 

 Anonioiira superiora: from the Anomnra of Henderson in the 

 exclusion of the Dromidea and Raninidea, and they correspond 

 with the Anomonra Schizosomi of Stimpson."* Of the five legions 

 adopted for their classification in my History of Crustacea, 1893, 

 the Pagurinea and Lithodinea belong to the Paguridea, tlie 

 Porcellaninea and Galatheinea to the Galatheidea- This last tribe 

 is now divided by Ortmann and by Alcoclc into four sections or 

 families — Aeglaeidae, Porcellanidae, Galatheidae, and Uropty- 

 chidae- A. Milne-Edwards and Bouvier (1899) prefer to use a 

 slightly different terminology, speaking of a famSly Galatheidse, 

 with three sub-families — Aegleinae, Galatheinse, Diptycinae, 

 the Galatheinae comprising two tribes, the " Galatheines and 

 Porcellaniens." 



FaM. : PORCELT.ANIDAE. 



Henderson, in his Report on the Challenger Anonnura, gives 

 the Porcellanidae without definition as the single family of the 

 Porcellanodea, which is his Section A of the Galatheidea. He 

 gives the following definition of the section, which will apply to 

 the single family: — 



" Carapace broadly oyate, smooth, with the regions but faintly 

 defined ; the front usually trilobed, and the processes never of 

 great length. Chelipedes broad and often flattened, the ambula- 

 tory limbs robust and of nit'oderate length- Antennules con- 

 cealed ; the antennal peduncle directed backwards. Eyes always 

 pigmented and partially concealed in orbits- External maxilli- 

 pedes with the ischium [third joint] broad, and the merus [fourth 

 joint] provided with a prominent internal lobe. Abdomen bent 

 under the thorax; females with two (or three) pairs of slender 

 uniramous appendages borne on the fourth, fifth, (and third) 

 segmients ; males with a single genital pair on the second 

 segment. 



* .\Iilne-Edwards, Hist. Nat. Crust., vol. 2, p. 163 uses the expression " Section 

 des Decapodes Anomoures ; " Dana, U.S. Expl. Exp., Crustacea, pp. 1429, 1430, 

 following upon Section r, Anomoura superiora, has Section 2, Anomoura media, 

 Section 3, Anomoura submedia, and Section 4, Anomoura infeiiora ; Stimpson, in 

 part 7 of his Prodromus, Proc. Acad. Sci. Philad., 1858, at p. 65 introduces the 

 Schizosomi as second division of the Crustacea Anomoura. 



