202 



ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



The specimens were in all stages of age and I can fully confirm 

 Ortmann's observation (1894) that the chelipeds of the young males are 

 of a female character, with only faint development of teeth on the fingers ; 

 it is only in full-grown specimens that the chelipeds attain a large size. 



M. japonicus seems to have been found only in Japan, where it 

 replaces M. clepressus. Evidently it is not uncommon there, for Ortmann 

 (1894) mentions a series of no less than 47 cT and 24 9 collected in the 

 Bay of Tokio by Doderlein. 



The dimensions of some of my specimens are the following : 



1 



Distance between outer orbital angles . . 31. — 



Distance between antero-lateral teeth . . 33. — 



Length of carapace 21. — 



Least breadth of front 2.5 



2 



3 



4 



d 12 ) 



cT 



9 



30.5 



22.5 



24.— 



31.75 



24.— 



25.5 



20.75 



15.5 



17.5 



2.5 



2.— 



2.25 



Of the 25 species of Macrophthalmus here accepted, the following (16) 

 are represented in the collection of the Leiden Museum: 



M. pectinipes Guérin. 



„ transversus (Latreille). 



., telescopicus (Owen). 



„ grandidieri A. Milne-Edwards. 



„ dilatatus de Haan. 



„ b revis (Herbst). 



„ hilgendorfi n. n. 



„ crassipes H. Milne-Edwards. 



Nine species therefore are absent: 



M. latipes Borradaile. 

 „ sulcatiis H. Milne-Edwards. 

 „ consobrinus Nobili. 

 „ dentatus Stimpson. 

 „ punctulatus Miers. 



Leiden Museum, October 1915. 



M. convexus Stimpson. 



„ erato de Man. 



„ latreillei (Desmarest). 



„ quadratus A. Milne-Edwards. 



„ p'acificus Dana. 



„ tomentosus Souleyet. 



„ depressus Riippell. 



„ japonic us de Haan. 



M. latifrons Haswell. 

 „ setosus H. Milne-Edwards. 

 „ crinitus Rath bun. 

 „ definitus Adams & White. 



1) Type male specimen of de Haan (dried). 



2) Specimen here figured (preserved in alcohol). 



