REPORT ON THE AMPHIPODA. 



1731 



Deutognathes (Sevrepos, second, yvdBos, jaw), Milne-Edwards 

 gives this name to the. first maxilla;, as following the 

 mandibles which he calls protogaathes. 



Development, Milne-Edwards, 154, 160 ; Rathke, 171, 182 ; 

 Leydig, 225, 482 ; Meissner, 287 ; Spence Bate, 290, 327 ; 

 Valette, 320 ; Fritz Miiller, 350 ; Bessels, 387 ; Beneden, 

 391; Beneden and Bessels, 392; Dohrn, 403; Packard, 

 448 ; Huxley, 463; W. Thomson, 472; Uljanin,525, 531 ; 

 Faxon, 533 ; Clans, 339, 553, 598 ; this Report, 1214, 1602. 



Diastole (SiavroXri, a drawing asundei', dilatation), 505, 507. 



Didactyle, vaguely used by the older authors for hands that 

 were either chelate or subchelate, but from its contrast to 

 monodactyle, the correct use was probably for the former; 

 86, 97. 



Dimorphism of males, 349, 408, 554, 562, 1024. 



Dimorphism, sexual, 596, 1649. 



Distribution, Kr0yer, 180, 197 ; Eichwald, 193 ; Dana, 264 

 Lindstrom, 287 ; Heller, 359 ; Lilljeborg, 360 ; Bate 

 363 ; Brady, 375 ; Edward, 381 ; v. Martens, 384, 566 

 Norman, 386, 458, 584 ; Boeck, 410 ; Mobius, 421 

 Smith, 434, 557 ; Metzger, 445, 446 ; Miers, 467, 555 

 Forel, 476; Fries, 494; Joseph, 496; Wrzesniowski, 501 

 1655 ; Haswell, 514 ; Markham, 517 ; Stuxberg, 523 

 Mayer, 535 ; Blanc, 548 ; Chilton, 551 ; Schmarda. 

 Forsstrand, 577 ; Gerstaecker, 57S ; Koelbel, 584 

 Perrier, 585 ; Bovallius, 592 ; Chevreux, 596 ; Ross, 

 1620 ; Orsted, 1621 ; Whymper, 1648 ; Barrois, 1649. 



Dolabriform (dolabra, a mattock or pick-axe), 103. 



Domicola (domus, a house, colo, I inhabit), a term applied by 

 Bate and Westwood to a group formed by the two 

 families Corophiidas and Cheluridfe, but in fact of more 

 extensive application ; 290, 328, 375, 483, 522, 527, 529, 

 542, 564, 578. 



Drehgelenk (trochlea, turning-joint), 4S5. See Ischiopodite. 



Diinndarm, 489. 



Ecdysis (exSucris, a getting out ; eicSvu, I strip off). See 

 Exuviation. 



Edrioftalmi, 205. 



Edriophtalmes, 174, 417, 1647. 



Edriophthalma (eSpcuoj, sitting, sessile, 6<pea\n6s, an eye), Leach, 

 1815 ; a term evidently based on the word " sessiliocles " 

 introduced by Lamarck in 1S01 ; 89, 122, 157, 166, 

 169, 242, 246, 281, 282, 289, 295, 304, 601. 



Edriophthalmaria. Gerstfeldt, 1858, adopts this form, giving 

 the reference "Legio Edriophthalmaria M. Edw. (Ann. 

 d. sc. nat. 3eme ser., 1852, xvm. 120, 121)." He also 

 observes that Dana's Edriophlhalmia embrace not only 

 the Choristopoda, that is the Edriophthalma of most 

 other authors, but also the Trilobita, Entomostraca, and 

 Rotifera, giving a reference to "Unit. Stat. expl. exped. 

 Crust. I, 10." 



Edriophthalmata, 222, 375, 521. 



Edriophthalmes, 136, 155, 184, 316. 



Edriophthalmia, 215, 259, 264, 463, 468, 528, 547, 554. 



Edriottalmi, 389, 390, 468. 



Eleutherognatha (<=\eu0epos, free, yv&Qos, a jaw), 449. 



Endophraymal arch (evSov, within, (ppaypa, a fence), 299, 463, 

 485. 



Endopodite {cvSov, within, ttovs, a foot), 1655 ; in the Crustacea 

 the typical appendage attached to each side of a segment 



is considered to be composed of a basal piece, the proto- 

 podite, bearing a podobranchia, an endopodite and an 

 exopodite, the endopodite, attached to the inner side of the 

 extremity of the protopodite, the exopodite to the outer 

 side. In the seven-jointed limbs of the Amphipoda, the 

 first joint coalescent with the side-plate and the first free 

 joint constitute the protopodite, the remaining five joints 

 being the endopodite. To some of these appendages in the 

 female a marsupial plate is attached, which possibly 

 represents the exopodite. Some of them also in both 

 sexes carry a branchial vesicle. In the upper antenna 

 the protopodite by way of exception exhibits three joints, 

 the so-called primary fiagellum being in all probability 

 the endopodite, while the secondary fiagellum when pre- 

 sent would seem to be the exopodite, although it is found 

 on the inner side of the appendage. The bifurcation of 

 the limbs is readily observable in the appendages of the 

 pleon. See Huxley, The Crayfish, pp. 145, 173. See 

 Tige, 153. 



Enoplopodes, Hesse, 1873 ("De ev<nr\os, arme ; wovs, tto56s, 

 pied"), 417. 



Enteron (ivrepov, a paunch), 477. 



Entomeiliue, 134. 



Entomozoaires (ivTopa, insects, (da, living creatures), 94. 



Enzyme (£vpi), leaven), 489, 525. 



Epimera (eVf, over, wpos, thigh), 185, 202, 289, 452, 485, 597, 

 598. See Coxopodite. 



Epipharynx (iirl, over, (papvy£, throat), the palate or upper part 

 of the throat that succeeds the mouth-opening, 450. 



Epistome (en-i, over, arifxa, the mouth). In the Amphipoda it 

 is generally placed vertically, sometimes forming a ridge 

 or produced to a sharp point. It sends up a narrow 

 prolongation between the lower and upper antennae to the 

 rostrum. Below it widens, and' forms the clypeus, in 

 which the labrum is attached. Its inner surface gives 

 attachment to the flexor muscles of the mandibles (Boeck). 

 289. 



Epithelium (eVi, over, 6r\\r], a nipple); "Under the general 

 name of epithelium, may be included a form of tissue, 

 which everywhere underlies the exoskeleton (where it 

 corresponds with the epidermis of the higher animals), 

 and the cuticular lining of the alimentary canal, extending 

 thence into the hepatic caeca. It is further met with iu 

 the generative organs, and in the green gland. Where 

 it forms the subcuticular layer of the integument and 

 of the alimentary canal, it is found to consist of a proto- 

 plasmic substance, in which close-set nuclei are imbedded. 

 If a number of blood-corpuscles could be supposed to be 

 closely aggregated together into a continuous sheet, they 

 would give rise to such a structure as this ; and there 

 can be no doubt that it really is an aggregate of nucleated 

 cells, though the limits between the individual cells are 

 rarely visible in the fresh state. In the liver, however, 

 the cells grow, and become detached from one another iu 

 the wider and lower parts of the c?eca, and their essential 

 nature is thus obvious" (Huxley, The Crayfish, pp. 

 177, 178). Bruzelius in describing the inner structure of 

 an Amphipod gives a similar account. In Amphithoe 

 podoceroides he notes as a peculiarity that the epithelial 

 liver-cells, which are hexagonal, contain two nuclei 



