Description of Genera and Species. 81 



the original description. These, however, looked at in the light obtained from the study 

 of the well-preserved specimens of C socialis from Ardross, show that such organs as are 

 preserved are more similar to those of the Euphausiidas than to the corresponding organs in 

 the macrurous Decapods to which I originally assigned the form. By permission of the 

 Council of the Eoyal Society of Edinburgh, some of the original figures of the species are 

 here reproduced. In figs 2, 8, .'> the massive nature of the peduncles of the antennules 

 is more in keeping with those of the Euphausiidas than those of any Decmpod. The 

 antennary system is of the ordinary caridean type, and thus is of no avail as evidence. 

 In fig. 2 the portion of the limb there shown flexes as in the Euphausiids, and is either 

 the palp of the maxillipede or one of the limbs of the last seven trunk segments. But 

 it is in the pleopods of the first two tail segments in the male form represented in figs. 2 

 and 3 that the Euphausiid character is most observable. Fig. (i is evidently one of the first 

 pair peculiarly modified for coupling spermatophores on to the females, and it was a 

 mistake to compare it with its homologue in Astacus. The telson is also quite 

 Euphausiid in construction. The most pronounced specific character is shown by very 

 much eidarged epimera of the second tail segment, which overlap those both in front 

 and behind, and further on to the former. LoeaJity. — LauG'holm, Dumfriesshire. 



Cu.-VN-(;i.i'si.s KLEGAXs (15. X. Peach). PI. XL, figs. 9, lU. 



1883. PaUvocrani/on ele^ians (H. X. Peach). Trans. Eoy. Soc. Hdiii., vol. xxx, p. 

 515, pi. xxviii., figs. 8, 8a. 



Remarks. — There ai'e several specimens belonging to this gracefid little form in the 

 collection. The best preserved are from the Whiteadder Water at Pathhead Mill, near 

 Duns, in Herwictkshire, where they lie eiUombed in shoals. They also occur sparingly 

 along with C. eskda/ensis in the Scorpion-bed of Langholm, in l)umfries.shire, at a some- 

 what higher horizon. Among the material from Duns are several specimens showing 

 the massive iieduncle of the anlemiules so characteristic of the Euphausiida' [ivj^. lO). 

 Li the nature of the e[)imei-a (fig. !)) this tbrm stands inlei-niediate between the two 

 groups into which this geiuis naturally divides itself. 



Locality.- — Whiteadder Water, Pathhead Mill, near Duns. 



Uorizon. — Near base of (Tuedian) Cemeiustone Group, Scottish Calciferous Sand- 

 stone Series. 



Collector. — A. Macconochie. 



' Pe.icli, Trans. Roj/. Soc. h'diii., 188'2, vol. xs.x., p. 85. 



