THE DECAPOD AND STOMATOPOD CRUSTACEA I47 



PISOSOMA GREELEYI sp. nov. 

 PI. VIII, fig. 4- 

 Male. Carapace slightly broader than long, subcircular. Front 

 with a double margin, the upper margin arcuate, continuous with the 

 line of the orbit ; the lower margin produced downwards in an acute 

 median tooth and forming a rectangular preorbital tooth. Postorbi- 

 tal tooth small and blunt ; behind this on the antero-lateral margin 

 there is a shallow lobe followed by a notch at the cervical suture. 

 Lateral margin marked by a narrow raised line which turns inward 

 on the carapace at the posterior third of the branchial region. Proto- 

 o-astric lobes large, separated by a shallow median sinus. Cervical 

 sutures deep, Branchio-cardiac furrows also well marked. A slight 

 transverse depression across the middle of the branchial region. Sur- 

 face ornamented with scattered scabrous granules, posterior and pos- 

 tero-lateral portions crossed by fine rugose lines. 



The upper surface of the merus of the chelipeds is crossed by fine 

 transverse rugte ; inner margin with a blunt and granular prominence 

 near the distal angle ; distal margin of lower surface with two or 

 three spinules. Upper surface of carpus, propodus and dactylus 

 covered with coarse granules, some of which are large and tuber- 

 cular. The carpus at its widest portion is about as wide as long ; 

 its inner margin is convex, and furnished with several small irregular 

 granulated teeth. The outer margin of the propodus is convex, with 

 a slight sinuosity toward the distal end of the palm. The palm is as 

 wide as its length on the inner side. The fingers gape when closed ; 

 the tip of the dactylus fits into a sinus on the inner edge of the pollex 

 near the tip. Ambulatory legs smooth. Last three segments sparsely 

 hairy. 



Dimensions.— M.ix\Q, length 5 mm.; width 5.2; length of propo- 

 dus of cheliped 5.8; width of same 3. Female with eggs, length 

 5.2; width 6; length of propodus of cheliped 7.5; width of same 

 4.3 mm. Females are more swollen laterally than males. 



Color.— In formalin, a light brick red. Terminal half of fingers 

 white. 



Type locality. — Coral Reef, Maceio, Alagoas ; three males, three 

 females. Cat. No. 23754. 



Additional localities. — Mamanguape stone reef, one female with 

 eggs; Pernambuco stone reef at Ilha de Nogueira, one male. 



