Descrijjtion of Genera and Species. '-9 



one side. The extremely shortened tail is also well displayed, and the component parts 

 of the tail fan. The telson is so wide compared with its length that there is no 

 appearance of a constriction, but nevertheless it ends with a fimbriated band wliich 

 doubtless represents the terminal fimbriated lobe in the more elonp^ated forms. 



Locality. — Chattlehope, Eede Water, Northumberland. 



Horizon. — Calciferous Sandstone Series. 



Collector. — J. Rhodes. 



Pseudo-Galathea orxatissima B. N. Peach. PI. Ill, figs. 25-29. 



1882. Anthrapalcemon ornatissimus B. N. Peach, Trans. Eoy. Soc. Edin., vol. xxx., 

 pt. i., p. 83, pi. viii., fig. 7. 



1883. Pseudo-Galathea ornatissima, B. N. Peach, Ibid., pt. ii., p. 515, pi. 

 xxviii., figs. 7-7b. 



Remarks. — Additional information has been obtained with regard to this species. 

 Figs. 25, 26, natural size, show the relation of the carapace to the tail. They also show 

 the great contrast between the llagella of the antenme and those of the antennules, the 

 wide sternites showing up through the crushed carapace, the tail segments, and the tail 

 fan. The tip of the telson in the present form appears to be bordered by a fimbriated 

 band which is not divided off from the rest of the telson by a constriction, as in Ps. 

 macconochiei. Figs. 25-27 show some of the details of the tail segments, and that the 

 central ridge keel is continued through these as a ridge. In addition to showing the 

 tail with its central ridsje keel, fig. 25 exhibits the bases of several of the limbs on 

 the left side and fragments of several others on the right side. In fig. 28 the tail fan 

 of another specimen is shown enlarged two diameters. A restoration of this .species 

 drawn by me twenty years ago is shown in fig. 29. 



Localities. — Glencartholm, Langholm, Dumfriesshire, and Coomsdon Burn, Rede 

 Water, Northumberland. 



Horizon. — Scorpion-bed and Cementstone Group (Tuedian), Scottish Calciferous 

 Sandstone Series, and English Carboniferous Limestone. 



Collectors. — A. Macconochie and J. Rhodes. 



Genus ANTHRAPAL^ExMON J. W. Sailer, 1861. 



ISGl. Aiithrapala'mon J. W. ^Salter, Quart. Journ. Geol. Soc, vol. xvii., p. 529. 



Remarks. — It is proposed here to restrict this generic name to such applanated 

 forms as the type species Anthrapakemon grossarti J. W. Salter, having expanded 



