CARCINOLOGICAL STUDIES. 



4? 



respectively 7^/4 mm. and 2^/5 mm. The meropodites of 

 the penultimate pair have a length of 8^/3 mm. , and a 

 breadth of 8^4 mm. in Gelas. inversus, whereas these 

 numbers are IOV3 ^^" ^^^ ^^'4 ™'^- ^^ ^^^ Japanese species. 



As V7ill be seen when comparing my description with 

 that of Gelas. cMorophthalmus , this species is quite dis- 

 tinct from Gelas. inversus. 



Gelas. inversus Hoffmann has been collected on the 

 shores of Mozambique and of the Island of Nossy-Faly. 



21, G ela simu s triangularis A. M. E. 

 var, variabilis de Man. 



(PI, 4, fig, 13). 



Gelasimus triangularis, A. Milne Edwards, in: Nouv. Archives 

 du Muséum , T. IX , p. 275. 



Gelasimus triangularis, de Man, in: Journal of the Liimean Soc, 

 of London, Vol. XXII, 1888, p. 119, PI. VIII, figs. 8—11. 



The Leyden Museum contains about forty specimens ((ƒ , 

 Q) which were collected at Amboina. These individuals 

 present some slight differences from specimens of Gelas. 

 triangularis from the Mergui Archipelago , which I have 

 before me and which are to be considered as to represent 

 the typical form of this species , having been compared 

 with type-specimens of the Paris Museum by myself when 

 writing my j» Report on the Mergui Crustacea". 



As to the cephalothorax , I observe that the inferior 

 margin of the orbits is a little less finely crenulate, espe- 

 cially externally, than in the Mergui specimens, and that 

 an accessory row of fifteen or sixteen small 

 granules exists on the lower wall of the orbits 

 near the inferior margin , both in the male and in the 

 female, which are not found in the Mergui form. In the 

 second place the teeth with which the inner margins of 

 the fingers of the larger hand of the male are armed , are 

 placed otherwise than those which are found on the hands 

 of the Mergui specimens. These teeth, indeed, are placed 



JNotes from the Leyden IMuseixm, Vol. XIII. 



