198 
Synonymy and remarks on the species. Some remarks 
must be made as to the synonymy. The genus Talitroides differs 
from Talitms in the reduced pleopoda; but Calman (1. c. above, 
pp. 135 —36) has clearly realised that the stage of development of 
the pleopoda may vary in a certain degree, so that Talitroides must 
be dropped as a genus, and Talitroides bonnieri is thus probably 
identic with Talitrus Ålluaudi. 
Furthermore there cannot be much doubt that also Orchestia 
senni is merely a synonym. Calman (1. c. 1912, p. 136) has called 
attention to the faet that only the $ (not the (^) of Orchestia 
senni is known; it is therefore probable that the species does not 
belong to the genus Orchestia, but to Talitrus, and at my compar- 
ison of the present specimens with the descriptions, given by Che- 
vreux 1896 and 1901 and by Menzel 1911, it was not possible 
to find any important disagreement between the two “species" (but 
it must be remembered that Menzel does not say anything as to 
the pleopoda). 
I have not been able to trace the . 
One of the $ (6 mm) has 3 very large ova, each of them 
even as long as the first pereional segments. 
My specimens dilfer from Talitrus Ålluaudi Chevreux 1901, p. 
389 seq., figs., in the following points. Epimeral plate of 1. meta- 
some segment has the hind corner shaped almost as that of 2. and 
3. segments, but it is not shortly rounded as shown by Chevreux 
(fig. 1). Pleopod 1 not so reduced as mentioned by Chevreux 
(fig. 4 and p. 391): inner ramus is half as long as outer ramus 
and consists of 4 joints. Pleopod 2 is at the stage of development 
described by Ch. for pip. (Chevreux fig. 4)-: inner ramus has only 
1 joint (not 3). Pleopod 3 is as drawn by Chevreux (fig. 5). Uro¬ 
pod 1 has rami a trifle shorter (nol longer) than peduncle. 
From Menzel 1911 the specimens disagree in the following 
characters. I have not been able to find the fine setæ on the pro¬ 
cesses of 4.—6. joints of pereiopod 2. Epimeral plates of the 3 
metasome segments are said to have on the hind corners “ein- 
zelne schwache Einkerbungen mit kleinen Dornen"; I have not 
been able to find these exeavations and spines. (Menzel does not 
quote the pleopoda). Telson has 4—5 (not 6—7) pairs of spines, 
and there is no notch in the hind edge. — 
