84 Dr. R. Kossman on the Entoniscide. 
In Entoniscus the pereiopods are “ reduced to nearly sessile 
inarticulate roundish lumps.” 
In Entione they are jointed and furnished with terminal 
claws. | 
In Entoniscus the pleon is destitute of all appendages ; the 
last segment bears only some minute spinules. 
In Entione there are, on the anterior segments of the pleon, 
unpaired, ventral, horn-like processes bent backward (see 
fig. 4), of which the foremost is the most considerably de- 
veloped ; but the apical segment bears two spiniform appen- 
dages exceeding it in length, and curved ventrally, which, by 
curvature of the pleon, can be moved towards the above- 
mentioned unpaired processes, and with these, like the arms 
of a forceps, assist in the fixation of the animal. 
In Entoniscus, lastly, the head is narrow, and the antennal 
lobes, which are quadrangular, project laterally far beyond 
the margin of the head. In Hntione, on the contrary, the 
head is broad, and the rounded antennal lobes scarcely pro- 
ject laterally beyond its margin. 
No distinctions appear to exist between the males of the 
different species of Hntione, at any rate not between the 
European species. 
I come now to refer to the females, and first of all to their 
external form. Here also 1 commence with those peculi- 
arities which are proper to the Hntoniscide in general, but 
wanting in the Bopyride. 
In the first place the trunk is entirely or almost entirely 
unsegmented (see fig. 2), and it is destitute of the dorso- 
ventral depression. The head is considerably broader than 
- the trunk, and distinctly notched by a longitudinal furrow 
(fig. 3). Jointed antenne are deficient, as also, apparently, 
piercing mandibles, and also pereiopods. 
On the other hand, all the Entoniscide share with the Bo- 
pyride the possession of separated paired brood-leaves on the 
ventral surface of the pereion. As regards EZ. porcellane this is 
distinctly shown by F. Miiller’s figure (1, Taf. 11. fig. 15 see 
‘Annals,’ ser. 3, vol. ix. pl. u. fig. 8); but he also says 
expressly, ‘‘The brood-plates, on the other hand, are deve- 
loped into enormous, much-folded, lobate, and slit membra- 
nous lobes. When I could count them distinctly . . . I found 
six pairs.” With regard to H. cancrorum (Entione), on the 
contrary, the same author says (2, p. 55), ‘In Hntoniscus 
cancrorum there is present a closed brood-chamber, formed by 
a single pair of brood-leaves originating close behind the 
head. . The brood-chamber forms a sac, of very variable form 
and size, directed obliquely forward, applied by its upper 
