SESARMA BÜTTIKOl-EHI. 163 



what affinities to the subgenus Metagrapsiis , while it 

 agrees with the subgenus Holometopus by the straight, 

 nearly undivided upper margin of the front. 



Distance ot the external orbital angles of a male speci- 

 men 36 m.m., length of the carapace being 30 m.m. — 



Length of the inferior margin of the hands of this same 

 specimen 32 m.m., Height of the hand 19 m.m. 



20. Sesarma BUttikoferi n. sp. 



A species at first sight distinguished by the characteris- 

 tical shape of the hands. 



Male. The carapace is quadrilateral in outline, a little 

 broader than long. The dorsal surface is flat in the middle 

 and posteriorly , but somewhat convex in front and along 

 the sides. The protogastric lobes are divided, for a very 

 short distance anteriorly, into four nearly equal little pro- 

 minent lobules and are limited next the orbits by rather 

 shallow depressions , which extend to the antero-lateral 

 angle of the carapace. The anterior half of the upper sur- 

 face of the protogastric lobes is marked with small rugose 

 granules , a rugose transverse line occurring between these 

 granules at some distance behind the two lateral lobes ; the 

 mesogastric lobe extends forward , in the median sulcus 

 between the protogastric lobes, nearly to the front. The 

 hepatic and branchial regions are traversed by sharp oblique 

 plications. Some parts of the posterior half of the surface 

 of the carapace is very minutely punctate. The front is 

 a little broader than half the distance of the external or- 

 bital angles , perpendicular and low and the inferior margin 

 is broken by a broad excavation in the middle; its con- 

 cave surface is minutely granulated , some larger granules 

 occurring near the upper margin. The lateral margins of 

 the carapace are entire and the antero-lateral tooth (the 

 external orbital angle) projects well forward. 



The cephalothorax is not thick and its under surface 

 (the abdomen included) is smooth. 



The smooth concave internal surface of the trilateral 



Notes from the Leyden Musexiiii, "Vol. V. 



