o-i 9 CRUSTACEA. 



Family II. MACROPHTHALMID^E. 



The Macrophthalmidae are remarkable for the length of their eye- 

 peduncles; for their trapezia! or quadrate form, the anterior angles 

 being prominent, and the breadth of the carapax generally greatest 

 between them; and for having the male abdomen much narrower 

 behind than the contiguous part of the sternum. The species of 

 Grapsidse which approach most to the Macrophthalmida> have a ridge 

 (usually piliferous), crossing obliquely the third joint of the outer 

 maxillipeds, and may thus be distinguished, as this character belongs 

 to no true Macrophthalmicla?. 



In the genera of this family, the outer maxillipeds are wholly ex- 

 posed, excepting in a small group, in which the extremity is concealed 

 beneath the broader basal portion. And among those having these 

 maxillipeds of the normal character, part have the inner antennae 

 transverse, and part longitudinal. There are thus three distinct sub- 

 families in this family. Their characters and the distinctions of the 

 genera they contain, are as follows : 



Subfam. 1. MACROPHTHALMIN.E.— Antenna- interna' transversa-, 

 sub fronte insitoo. Antenna^ externa 4 basi i'rontem appressa\ Ar- 

 ticulus maxillipedis externi 4tus apertus. 



G-. 1. Cleistostoma, Be II.* — Carapax subquadratus, paulo transversus. Frons 

 quarta parte latitudinis carapaeis vix brevior. Oculi lougiu^culi. lilies autici 

 maris fern inseve breves. Articulus maxillipedis externi 3tius 2do vix minor, 

 quadratus. 



Gr. 2. Macrophtiialmus, Latr. — Carapax latus, tranpveram reetangulatus. 

 Frons angustissimus. Oculi longissimi. Articulus maxillipedis externi 3tius 

 2do niulto minor. 



Subfam. 2. OCYPODINiE.— Antennrc interna? longitudinales, juxta 

 frontem utrinque insitae. Antenna? externa) fronte paulum remotse. 



Articulus maxillipedis externi 4tus apertus, Stius -do minor. 



1. Articulus maxillipedis cxlerni 2<Jus 3tio Vdltfe Jiinjor. 



G-. 1. G-elasijMus, Latr. — Oculi gracilcs, cornea parvula, pare oblonga. Pedes 



* Crust., Faun. Japon., p. 20.— From xXsuft-of, shut, and ffropa, mouth — not Cfci* 

 totoma. 



