310 bulletin: museum of comparative zoology. 



Plagusia immaculata Lamarck. 

 Plagusia immaculata de Man, Arch. f. Naturg., 1887, 53, Bd. 1, p. 371. 

 Dutch New Guinea : Soroug ; 1 juv. 



XANTHIDAE. 



Carpilius convexus (Forskal). 

 Carpilius convexus Alcock, op. cit., 1898, 67, p. 80. 

 Moluccas: Amboyua; 1 juv. 



Atergatis ocyroe (Herbst). 

 Atergatis Jioi idus Alcock, op. cit., 1898, 67, p. 98. 

 Moluccas : Ambovna -,1$. 



Leptodius exaratus (Milne Edwards), var. 

 Xantho (Leptodius) exaratus Alcock, op. cit., 1898, 67, p. 118. 

 Moluccas : Amboyna ; 2 ?, 1 ovigerous, 5.2 x 7-9 mm. These are not typi- 

 cal e.vf/ratus, but approach Stimpsou's var. /, acutidens.^ The carapace is well 

 areolated and coarsely granulated, the lateral teeth thickened, especially at the 

 tips, but not so prominent as in var. acutidens. 



Eriphia scabricula Dana. 

 Eriphia scabricula Alcock, op. cit., 1898, 67, p. 216. 

 Moluccas : Amboyna ; 1 9 , with rhizocephalid parasite. 



POTAMONIDAE. 

 Potamon (Potamon) granulatus (de Man). 



Plate 4, fig. 2. 



Potamon [Potamon) granulatus Rathbun, Npuv. Arch. Mus. Hist. Nat., 1904 (4), 6' 

 p 274. 



Java: Tjibureum, at 5200 feet elevation ; \ $ , dried. 



Length 38.2 mm., width 50 mm., width between the outer angles of the orbit 

 31.7 mm., width across lower edge of front 12.5 mm. This is the largest speci- 

 men yet taken. By comparison with the figures by de Man,^ it is seen to be 

 more swollen laterally at the branchial regions, and relatively narrower across 

 front and orbits ; the lobes of the front are slightly more oblique (sloping out- 

 ward and backward) ; the longitudinally oblique furrow ou the branchial region is 

 less distinct and more curved ; the rugosities of the carapace are quite as strong 



1 Smithson Misc. Coll., 1907, 49, p. 55, pi. 6, fig. 7. 



2 In Max Weber, Zool. Ergeb. Niederl. Ost-Indien, 1892, 2, pi. 16, fig. 5-5o? . 



