COLLECTED IN DUTCH NEW GUINEA. 311 



oblique; seen from in front, the line joining the exorbital angles touches the lower 

 edge of the front. Exorbital angles hardly at all prominent. Epibranchial tooth 

 indicated only by a very slight notch. Antero-lateral marginal line not extending 

 behind the anterior fourth of the length of the carapace, faintly granulated. Con- 

 tinuation of cervical groove hardly to be detected on lower surface of carapace. 



Third maxillipeds with a strong groove near inner margin of ischium ; merus much 

 broader than long. 



Chelipeds of male very unequal, merus with a sharp subterminal spine on its upper 

 edge, which is more sharply granulated than the lower, less so than the inner edge. 

 Inner tooth of carpus sharp and spiniform, with a small sharp tooth below it. Larger 

 chela recalling in shape that of " Gecarcinucus " ingrami, especially in having a 

 prominent, rounded, interdigital tubercle on outer surface, but the tooth at proximal 

 end of lower edge almost obsolete, and the fingers, though rather deep and flattened, 

 not so strongly toothed. 



Walking-legs very long and slender, those of second pair about two and a half times 

 as long as carapace. Merus with a subterminal spiniform tooth above and propodus 

 with a few spines on upper and lower edges. 



Abdomen of male narrow, the sixth segment slightly widened distally, where its 

 width is equal to its length; telson linguiform, with convergent sides, slightly longer 

 than sixth somite. 



Holotijiw. Male, Reg. No. 1914. 3. 12. 6 in British Museum. 



Remarks. This species is clearly related to that which I described as Gecarcinucus 

 ingrami from the St. Joseph River, New Guinea, standing, in respect of most of its 

 characters, midway between that species and P. aruana. 



PaRATHELPHUSA (LiOTELPHUSA ]) PLANA, sp. n. (Text-fig. 13.) 



Utakwa River. 1 male, 1 female. 



Description. — Carapace very flat, only the anterior region, from a line a little way 

 behind the epigastric lobes, strongly curved downwards ; depth much less than half 

 of the width. Surface everywhere closely punctate, with sharply-cut raised oblique 

 lines near the lateral borders. Central part of cervical groove well marked, but the 

 antero-lateral limbs almost obsolete. Epigastric lobes not at all prominent, their posi- 

 tion only marked by a slight rugosity and by the sharply-cut groove that separates 

 them. Frontal ridge rounded and not extending the whole width of the front. Orbits 

 small and their outer angles not at all prominent. Exorbital width very little more 

 than half the width of the carapace. Antero-lateral margins strongly curved anteriorly, 

 so that the greatest width of the carapace is rather further forward than in allied 

 species. There is, at most, a microscopic vestige of a notch to indicate the position of 

 the epibranchial tooth. Antero-lateral marginal line obscurely granulated. Postero- 

 lateral borders with marginal line more distinct, and extending for a greater part of 



