Ih'srriptiiin of Genera and Species. 69 



longitudinally, and set with a row oi' bristles along its posterior margin. Portions of 

 several legs, all directed forwards, are visible, showing both endopodites and exopodites, 

 but their lunnber cannot be computed, as those of both sides of the body seem to be 

 huddled up together. In the type specimens, the figures of which (figs. 1, 2) are 

 reproduced from the original ones, the dorsal portions of several endopodites are shown 

 which are constructed, not as in the true carideans, as was at first erroneously supposed, 

 but as in Euphausia, and flex backwards at the articulations corresponding with those 

 in the legs of that geims. A whole row of what are most probably the exopodites is 

 shown in fig. 2, and one of the fragments lying Ijehind the undoubted legs is evidently a 

 portion of the swimming plate or lash of such an exopodite. No breeding lamella; have 

 been observed, I)ut f(jrtunatel}' a portion of the gill has been detected, which is shown 

 magnified in fig. 5, a reproduction of the figure in the original description, and which 

 agrees in structure with the simple branching gills in the Euphausiidtu. Its position, 

 in the specimen, just behind tlie rounded posterolateral angle of the carapace, indicates 

 that it is a Ijranch of the gill of the last pair of trunk limbs, which in Euphausia is 

 identical in structure with that figured by me in 1882, when the description was first 

 given by me before the Eoyal Society of Edinburgh. Beside that figure I have placed 

 for comparison a tracing of one of the figures, after G. 0. Sars, of the magnified 'nil- 

 branches from the corresponding last pair of trunk limbs of the recent Euphausia 

 pellucida Dana (fig. 6). 



Locality. — River Esk, Glencartholm, near Langholm, DinntViesshire. 



Horizon. — Scorpion-bed, Calciferous Sandstone Series. 



Collector. — A . Macconochie. 



(ienus CRANGurSIS J. W. Salter, 18))8. 



1861. Uronectes J. W. Salter, Trans. Roy. Soc. Edin., vol. .xxii., p. 394. 



1861. Pala'ocrangon J. W. Salter, Quart. Jouz'n. Geol. Soc, vol. xvii, p. 531, fig. 8. 



1863. Cramjopsis J. W. Salter, Quart. Journ. Geol. Soc, vol. xix., p. SO. 



Crangopsis .soctALis J. W. Salter. PI. X., figs. 7-11. 



1861. Uronectes socialis J. W. Salter, Trans. Roy. Soc. Edin., vol. x.xii.. p. 3'J4. 

 1861. PalcBOcrangon socialis J. W. Salter, Quart. Journ. Geol. Soc, }>. ool, fig. 8. 

 1863. Crangopsis socialis J. W. Salter, Quart. Journ. Geol. Soc, vol. xix., p. 80. 

 Fresh light has been thrown on this species from the study of new material 

 obtained from the original locality at Ardross, on the Fife shore, by Mr. Wm. Anderson. 



