166 



ZOOLOGISCHE METJEDEELTNGEN — DEEL I. 



The Leiden Museum does not possess this apparently rare species, 

 the range of which seems to embrace the shores of the Indian Ocean 

 and not to extend into the Pacific. 



M. grandidieri A. Milne-Edwards (PL VI, Fig. 3). 



1867. M. grandidierii A. Milne-Edwards. Ann. Soc. entom. France, sér. 4, 



t. 7 p. 285 (Zanzibar). 



1868. „ grandidierii A. Milne-Edwards. Nouv. Arch. Mus. d'Hist. nat. 



Paris, t. 4 p. 84, pi. 20 f. 8—11 (Zanzibar). 



1881. „ grandidieri Lenz et Richters. Beitr. Crust. Fauna Madagascar, 

 p. 3 (Madagascar, Nossi-Bé). 



1894. „ gnmdidieri Ortmann. Jenaïsche Denkschr. Bnd. 8, p. 58 (Dar- 

 es-Salaam, Kilwa). 



1897. „ grandidieri Ortmann. Zool. Jahrb. Abt. Syst., Bnd. 10, p. 345 

 (no new record). 



1905. „ grandidieri Lenz. Abhandl. Senckenb. Gesellsch., Bnd. 27 p. 365 

 (Zanzibar). 



The following are the principal differences between this and the 

 preceding species, as summed up by Lenz. 



M. sulcatus 

 directed slightly back- 

 ward 



external orbital angle 



antero-lateral tooth of 

 carapace . . . . 



inferior orbital border. 



superior orbital border 

 ocular peduncles. . 



second transverse groove 



of the carapace . 

 branchial regions . 



directed outward 



regularly crenulated, 

 without intervals 



faintly curved 

 reaching beyond the 

 sides of the carapace 



distinct 



with three or four dent- 

 iculated tubercles in 

 a longitudinal row 



M. grandidieri 

 directed outward 



„ obliquely for- 



ward 



denticles of unequal 

 size, leaving a space 

 between them which 

 is as large as the base 

 of the denticle itself 



strongly curved 



reaching to the tip of the 

 first lateral tooth (ap- 

 parent orbital angle) 



less pronounced 



with faintly pronounced 

 tubercles, which are 

 often entirely absent 



