G74 Dr. F. A. Batlier on raljcomachus aiifflicus 



The second segment — tlie luiniernSj — wliicli is very clearly 

 exposed, has a len<]fth of 9"4 mm. and a greatest wi Jtli of 

 3"2 mm. On the side of the segment next the observer is a 

 serrate or granular longitudinal crest, nearer to the anterior 

 than to the posterior margin, and dying away distally. 



The chela of Palaomachua anglkus, drawn, with camera lucida, from the 

 two halves of the holotype (Brit. Mus. 1.994 «) bv Miss G. M. 

 Woodward. Where the outline is expressed by a dotted line, the 

 precise limits are not clear in the fossil, x I5 diam. 



The tliird .segment — the brachinm — is not so clear in the 

 relief, but is better sliown on the counterpart. Its length is 

 about 10 mm., its width about 3*3 mm. There is a slight, 

 non-granular, longitudinal ridge, perhaps two, on the side 

 next the observer. 



Tiie hand has a length of 8" 2 mm., measured from the 

 proximal joint to the groove between the t\vo fingers; it has 

 a greatest width of 6 6 mm. The outline is subquadrate, 

 tending to rhomboidal, with the lobe scarcely defined. The 

 outer portion, leading up to the movable finger, is separated 

 by a longitudinal depression from the main oval portion. 



Tlie fingers are long and slender. The outer one appears 

 to have been the movable finger, and the articulation to the 

 hand can be distinguished in the rtlief ; the distal ])ortion is 

 jireserved only in the counterpart. Tlie length of this finger 

 is 10*5 mm.; its widtii in tlie distal two-thirds does not 

 exceed 1"7 mm.; but at the proximal end is a projection (the 

 finger-lobe) on the inner side. The outer margin has a 

 slight convex curvature. The inner or anterior finger, which 

 does not appear to have been movable, has a length of 

 8"7 mm. ; its width in the distal two-thirds does not exceed 

 2 mm. ; but at the proximal end is a projection on tlic inner 

 side, as well as a knob, so that between the knob and the 

 projection lies a longitudinal groove, which may have received 

 flie finger-lobe. The knob may, however, be merely a piece 

 of the matrix filling the exoskcleton of the finger, the rest of 



