Vol. 60.] EOSCORPIUS SPARTHENSIS FROM LANCASHIRE. 



:*97 



A dark stain is observed next to the abdominal portion of the 

 animal, and probably represents the soit portions which have 

 been squeezed ont by pressure. 



Fig. 3. — Abdominal segments of Eoscorpius sparthensis, sp. nov. 



(Enlarged 2 diameters.) 



2. 



3. 



1 = First segment of post-abdomen. 



2 = Third segment of post-abdomen. 



3 = Sixth and seventh segments of pre-abdomen. 



The post-abdomen lies sideways, with the right side upper- 

 most. The dorsal and lateral keels are well marked on the first 

 four segments. Nearly all the segments seen are flattened. The 

 first is 5 millimetres long, 5 mm. broad, and shows a row of 

 granules on the left lateral keel. The second is 5 mm. long and 

 4 mm. broad. The third and fourth segments are 6*5 mm. long 

 by 4 mm. in breadth respectively. The fifth segment is only partly 

 preserved, but may reasonably be inferred to have resembled the 

 fourth. The tail-spine or sting is absent. 



The following are some of the measurements of the specimen : — 



Millimetres. 



Greatest length of cepbalothorax 10 



Greatest breadth of cephalothorax 10 



Total length of pre-abdomen 26 



Greatest breadth of pre-abdomen 12 



Total length of post-abdomen preserved 27 



Length of chela of second appendage 18 



Greatest width of chela of same 4 



III. Comparison with other Species. 



It is unfortunate that the carapace is not better preserved, so as 

 to show the median and lateral eyes, for these are the organs on 

 which generic classification proceeds. Although deprived of the 

 chief aids to generic distinction, the general form of the animal 

 leaves no doubt that it belongs either to Eoscorpius or to Eobuthus. 



In appearance, it is almost identical with Eolmtlms rahovni- 

 censis, Er., 1 though in measurement it differs slightly from that 

 species. The whole animal is shorter, being about 74 millimetres 

 when extended, whereas Eobuthus rakovnicensis measures 75 mm. 



Fritsch, ' Pabeozoische Arachniden' 1904, pp. 73, 74. & pi. xii. 



