246 CARCINOLOGICAL STUDIES. 



is not quite half as long as the greatest width of the 

 cephalothorax. The anterior margin of the front, measu- 

 ring scarcely a fifth of the greatest breadth of the cepha- 

 lothorax, forms very oblique, obtuse and rounded angles 

 with the upper margin of the orbits; the anterior margin 

 is , as in Geot. picta , deflexed downwards and backwards 

 in the middle, uniting itself with the epistome. 



Highly characteristic of this species are the orbits. In 

 Geot. picta , like in most other species of Telphusa , the 

 imao"inary line uniting the external orbital angles with 

 one another coincides with the anterior margin of the 

 front , so that the orbits show a transverse direction , their 

 external angle being placed at the same level as the an- 

 terior margin of the front. In Geot. loxophthalma , how- 

 ever, the orbits appear to be directed (fig. 3^^) very 

 obliquely and their external angles to be si- 

 tuated below the anterior frontal margin, when 

 the carapace is looked at from the front , so that the ima- 

 ginary line which unites the external orbital angles, does 

 not coincide with, but lies below the anterior margin 

 of the front. The orbits are small and longer 

 than high, the proportion of their length to their height 

 being as 5:3. The upper orbital margin is a little sinu- 

 ous , the lower arcuate, and both pass directly into one ano- 

 ther, without any interruption or hiatus, at the 

 external angle, that is little prominent and not tooth- 

 like. When the carapace is looked at from above, the 

 external angles of the orbits appear however to project a 

 little more forwards than the anterior margin of the front , 

 which is not the case in Geot. picta. The anterior margin 

 of the front and the margins of the orbits are quite 

 smooth, not crenulate. At some distance from the exter- 

 nal orbital angle, the antero-lateral margin of the cepha- 

 lothorax presents a very small emargination , but an epi- 

 branchial tooth may not be said to exist. The 

 strongly arcuate, antero-lateral margins of the cephalotho- 

 rax are distinctly indicated, though they are not cristate; 



Notes from the Leyclen IMuseurn , Vol. XI"V. 



