520 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



above the " Rosslyn Sandstone or Moor Rock," and lies some 20 

 or 24 fathoms above the Ell Coal. Anthrapalcemon Grossarti, de- 

 scribed by me in the above- quoted memoir, was from a bed 960 feet 

 below that coal. 



Pal^ocaeabus Russelliant/s, spec. nov. 



P. biuncialis. Cephalothorax oblongus, quadratus, ad latera scaberrimus, hand 

 divisus, nisi a sulco cervicali punctato vix conspicuo transverse sectus. Rostrum 

 latum, profunde serratum. Antenna parvulce. Antennula ad basin late ex- 

 panse, spinuloses. Abdomen ? Cauda 1 



Figs. 1 & 2.- 



■Carapace and portions of the Appendages o/Palseo- 

 carabus Russellianus. 



Kg. 1. 



Fig. 2. 





Fig. 1. Natural size. 



Fig. 2. Outline slightly enlarged : a. Antennule ; b. Antenna ; c. Scale of 

 the Antenna. 



Description, — The carapace is convex, for it is partly pressed on one 

 side. The serratures are as in the other Glasgow species, Anthra- 

 palaimon Grossarti, but the central keel reaches the posterior margin, 

 and joins as strong a cervical furrow as in A. dubius. This cervical 

 furrow is marked out by a line of deep punctations, not furnished 

 with spines ; and a rather deep depression occurs near the anterior 

 angle of the gastric (?) space (where a spine is present in A. dubius). 

 The rostrum appears to be a very prominent and triangular mass, 

 with a broad, strongly serrate, plate-like crest running down its 

 lower part as far as the cervical furrow. The front part (if I do 

 not deceive myself) is destitute of this crest, and is moreover sepa- 

 rated by a rather deep furrow from the hinder portion, so as easily 

 to break off and present the appearance given by A. dubius*. I do 

 not, however, speak with certainty concerning this rostral portion — 

 it is much obscured. The general surface is punctate, the puncta- 

 tions small and scattered; but towards the margin and front the 

 carapace is roughly and closely granular. 



* Quart. Journ. Geol. Soc. vol. xvii. p. 531, fig. 6. 



