738 TAOE SKOGSBKHG 



tho bDundarv bt'twi-cii tlu' oriijinal third iiiul Inurlli joints can he traced (in the species described 

 bv mo bolciw. E. Cliierckiav, tlie original fmirtli joint is moved liy special muscles); in oxccjit ioiial 

 cases even the proximal boundary of the original tilth joint is, though only partly, percei)tibl<'. 

 The proportions between the lengths of the (original) joints are about the same as in the male, 

 but tho original fifth joint is exceedingly small and weak. The bristles on the original fourth 

 joint are of about the same type and number as in the male. The original lillli joint has a some- 

 what fewer number of bristles than in the male (from two to four were observed); these bristles 

 are about as thick as or somewhat thinner than the sensory bristles on the original fourth 

 joint; some of them are, however. i)erhaps somewhat stronger than these; the h)ngcst of them 

 is about as long as or rather slightly longer or shorter than the bristles on the original fourth joint. 



Second ante n n a : — 



Male: — The p r o t o p o d i t e has no verrucae (contrary to the genus Conchoecia). 

 The first joint of the e x o p o d i t e is almost equally thick throughout its length. E n d o- 

 p o d i t e: The first joint is extensive, more or less conical and has no processus mammillaris. 

 The second joint has only two bristles, the f- and g-bristles, one of which is very long, sometimes 

 even as long as or somewhat longer than the shell. On the right endopodite the end joint is 

 developed as an elongated powerful clasping organ, with long proximal and distal shanks. Its 

 three bristles are attached at the angle between the proximal and distal shanks and are strikingly 

 different in length. On the left endopodite this joint has no distal shank; its proximal shank 

 is of the same type as that on the right side. The three bristles are situated distally on the joint. 



F e m ale: — The protopodite is similar to that of the male. Endopodite: 

 This has two joints. The first joint is like that of the male, but is somewhat weaker. The second 

 joint has, as in the male, only the f- and g-bristles, the longer of which is somewhat shorter than 

 in the male. The original third joint is almost completely reduced and has a varying number 

 (one to three) of bristles; it is joined to the original second joint. 



The mandible, maxilla, fifth, s i x t h and seventh limbs, penis, 

 f u r c a and lips are so incompletely known in the species described by preceding writers 

 that it did not seem to be convenient to include them in the genus diagnosis. With regard to 

 these organs I shall only refer to the description of E. Chierchiae given below. 



Rod-shaped organ: — This shows no — or at any rate very slight — dimorphism. 

 It is narrow, uniformly thick, and unjointed, in most cases slightly arched ventrally or almost 

 straight. For this organ in Zi\ /acMnosa G. W. Muller, see p. 575 above of the sub-family diagnosis. 



Number of species. Remarks: — This genus comprises only four species described so far, namely: 



E. Chierchiae, G. W. Ml'ller, 1890 a, p. 277; pi. XXVIII, figs. 1—10. 



E. aculeata (Th. Scott, 1894), G. W. MUller, 1906a, p. 129; pi. XXXII, figs. 18—23, 25, 26. 



E. lacunosa, G. W. MULLER, 1908, p. 80; pi. X, figs. 1—8. 



E. d^Arcy-Thomfsoni, Th. Scott, 1909, p. 128; pi. Ill, fig. 19; pi. IV, figs. 1—12. 



As is shown, however, by the remark under E. Chierchiae, p. 753 below, it is not quite 

 impossible that the first of these four species, in the scope that it is taken by G. W. Mtll.LKR, 

 1906 a, comprises two very closely-related forms. 



