EUPLAX BOSCH. 71 



The Museum contains a fine male Macrophthalmus , 

 found by Messrs. Pollen and van Dam in the bay of Pa- 

 sandava in Madagascar, which has not been described by 

 Mr. Hoffmann in his work on the crustaceans, collected 

 by these travellers. This species has been described and 

 very well figured by Mr. Hilgendorf as belonging to Ma- 

 crophth. brevis Herbst ; he had found this by a comparison 

 with the authentic specimen in the Berlin Museum. This 

 species however is quite different from Macrophth. carini- 

 manus Latr. , which was regarded by Mr. Hilgendorf erro- 

 neously as identical with Herbst's Cancer brevis. I find 

 the following differences: The carapace of Macrophth. 

 brevis is comparatively a little less enlarged and longer; 

 the transverse furrows on the antero-lateral regions are 

 less deep and the two verrucose tubercles on the branchial 

 regions are wanting; the second lateral tooth of the cara- 

 pace is larger and projects more outicard than the exte7'7ial 

 orbital angle, which is almost in contact with it. For the 

 rest the carapace 'is very minutely granulated. The arms 

 and the hands of the chelipedes are less elongated, less 

 slender; the hands are comparatively much higher and the 

 lower margin of the immobile finger is in a line with 

 the lower margin of the palm of the hand ; the tooth of 

 the index is placed transversely , in Macrophth. carinimanus 

 it is angular and sloping backward. The upper margin 

 of the hands is provided with some spiniform tubercles 

 in this species, but slightly granular in carinimanus; the 

 minutely granulated crest near the lower margin of the 

 hand is found in both species. 



Breadth of carapace (between the second lateral teeth) 

 22'/2 mm., length 9^/^ mm., length of the hand IS'/g mm. 



Euplax boscii And. 



Milne Edwards, 1. c. pag. 160. Krauss , Süd- African. 

 Crust, p. 40, PI. 11, fig. 5. Alph. Milne Edwards, Nouv. 

 Arch. t. IX, p. 281. 



Notes irom the Leyden ]M[useiim , Vol. II. 



