10 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



KEY TO THE SUBFAMILIES OF THE FAMILY MAJIDAE 



A'. Basal article of antennae extremely slender and usually long. Eyes without 

 orbits. Eyestalks generally long, either non-retractile, or retractile against 

 the sides of the carapace, or against an acute postocular spine that affords 



no concealment Subfamily INACHINAE, p. 1 1 . 



A^. Basal article of antennae not extremely slender. Eyes either with orbits, or if 

 without true orbits, the eyestalks are more or less concealed by a preocular 

 or postocular process, or are short and sunk in the sides of the rostrum. 

 B'. Basal article of antennae of moderate width, often broader at base than at 

 extremity. Orbits incomplete, never entirely concealing the cornea. 

 C^ Eyes without true orbits. Eyestalks little movable, short, and either 

 concealed by a supraocular spine, or sunk in the sides of the rostrum. 

 Basal article of antennae truncate-triangular. 



Subfamily ACANTHONYCHINAE, p. 140. 

 C^. Eyes with orbits, having a large, cupped postocular process into which 

 the eye is retractile. Basal article of antennae usually not truncate- 

 triangular Subfamily PISINAE, p. 193. 



B^. Basal article of antennae very broad. Orbits either complete or incom- 

 plete, but always complete enough to conceal the retracted cornea from 

 dorsal view. Eyestalks usually long Subfamily MAJINAE, p. 335 



KEY TO THE SUBFAMILIES OF THE FAMILY PARTHENOPIDAE 



A^ Carapace usually triangular, sometimes suboval or subpentagonal. Rostrum 

 simple. Chelipeds much larger than other legs. Branchial regions 

 deeply separated from cardiac Subfamily PAETHENOPINAE, p. 510. 



A^. Carapace usually sharply pentagonal. Rostrum cleft in two. Chelipeds 

 of moderate size. Branchial regions not deeply separated from cardiac. 



Subfamily Eumedoninae. 



Superfamily OXYRHYNCHA^^ 



Carapace more or less narrowed in front, and usually produced to 

 form a rostrum; branchial regions considerably developed, hepatic 

 regions small. Epistome usually large; buccal cavity quadrate, with 

 the anterior margin usually straight. Branchiae almost always nine 

 in number on either side; their efferent channels open at the sides of 

 the endostome or palate. Antennules longitudinally folded. 



Family MAJIDAE (^INACHIDAE^^^) 



Macropodiens and Maiens Milne Edwards, Hist. Nat. Crust., vol. 1, 



1834, p. 272. 

 Maiinea and Oncininea Dana, U. S. Expl. Exped., vol. 13, Crust., 1852, 



pp. 76 and 77. 

 Maiinea Miers, Journ. Linn. Soc, London, Zool., vol. 14, 1879, p. 640. 

 Maiidae Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 160. — Bor- 



RADAiLE, Ann. Mag. Nat. Hist., ser. 7, vol. 19, 1907, p. 480. 

 Inachidae Rathbun, Occas. Papers Boston Soc. Nat. Hist., vol. 7, 1905, p. 11. 



Chelipeds especially mobile, rarely much greater than the other 

 legs, or with fingers bent at an angle on the hand. Second article 



' " See Rathbun, Bull. No. 97, U. S. Nat. Mus., 1918, p. 14. 



12 Maja having been restored to validity in accordance with Opinion 10, International Commission on 

 Zoological Nomenclature, Publ. 1938, Smithsonian Institution, July, 1910, p. 15, it seems best to use also the: 

 family name Majidae in place of Inachidae. 



