MAIOIDEA. 121 



of post-rostral part of carapax, four lines. A much narrower species 

 than the subserratus, though resembling it. The first moveable joint 

 of the outer antennae is hardly one-sixth the length of the beak, 

 while it is between a third and a fourth part in the subserratus. In 

 the same transverse line with the post-medial tubercle there are either 

 side two small tubercles. 



Mek^thius depressus. 



Carapax breviter tuberculatum, latus (latitudine vix minore quam longitudo 

 posLrostralis); dentibus lateralibus tribus obtusis, null is bilobatis; rostro 

 longo apice emarginato ; regione mediand tumidd, post ice tumiduld; 

 regione postmediand fere obsoletd vel parce uni-tubercidatd, regione 

 intestinali uni-tuberculatd. Abdomen latum, oblongo-subellipticum . 

 Manus tenuis, digitis omnino contiguis, brachio parce tuberculato. 



Carapax low tubercular, broad (breadth hardly less than post-rostral 

 length) ; three lateral teeth obtuse, none bilobate ; beak long, emar- 

 ginate at apex ; median region tumid, posterior part prominent, but 

 not divided into two or more tubercles ; post-medial region nearly 

 obsolete, or with a trace of a tubercle ; intestinal region with one 

 tubercle. Abdomen broad, oblong subelliptical. Hand slender, 

 fingers in contact throughout by their inner margins ; arm with a 

 few small tubercles. 



Plate 4, fig. 6 a, specimen from the Sooloo Sea, enlarged four 

 diameters ; b, right hand ; c, outline of abdomen (segments not deter- 

 mined) ; d, beak of specimen from Upolu ; e, abdomen of Sooloo spe- 

 cimen. 



Dredged up in the harbour of the large island of Sooloo ; also found 

 at the Samoan Islands, about the coral reefs of Upolu. 



Length, three lines; greatest breadth, two lines. 



The abdomen resembles much that of females, but is only about hall' 

 the usual width, not being probably fully developed. The articula- 

 tions are all distinct in the Samoan specimen, but they may be in 

 part only sutures. The Sooloo specimen has the posterior margin of 

 the carapax slightly pointed at centre, and either^side near base of 



31 



