in 



178 

 Willemcesia, Grote. 



Vcidamia Willemoes-Suhtn, Nature VIII. 1873, p. 51. 



WMemcesia, Grote, Nature VIII. 1873, p. 485 : Spence Bate, Challenger Crust. Macrura, p. 162. 



Closely resembles Polycheles from which it differs in the following characters. 



The eyes, though immovably fixed and non-pigmented and non-facetted as 

 Polycheles, &c, are not impacted in sinuses of the anterior region of the 

 carapace, but are fixed just beneath and parallel with the anterior border of the 

 carapace. 



The inner (longer) antennular flagellum, like the antennal flagellum, is 

 nearly as long as the body, and the outer antennular flagellum, though short as 

 in Polycheles, is sometimes in the male very much thickened. 



The epipodites of the external maxillipeds and of the thoracic legs (1st 

 four pairs) are long, longer even than in Pentacheles. 



The 1st pair of thoracic legs, though of the same form as those of Polycheles 

 and having the joints similarly shaped, are longer, and the fixed finger carries 

 near the far end of the opposed border a large spine-like tooth. 



The last pair of thoracic legs are as perfectly chelate as the other pairs, 

 in both sexes. 



The branchial formula is the same as that of Polycheles, but the arthro- 

 branch of the external maxillipeds is larger. 



105. Willemcesia iiidica, n. sp. Plate I. fig. 1. 



Carapace about half a telson-length shorter than the abdomen, its lateral 

 borders parallel in their posterior half and slightly convergent anteriorly, its 

 surface when denuded is covered with sharp granules. The frontal border is 

 concave, with a small rostral spine and on either side of it a tooth. The lateral 

 borders are armed with numerous spines, namely, 7 or 8 + 5 or 6 in front of the 

 cervical groove, and from 15 to 20 behind it — these last being small and not 

 very conspicuous. The posterior border is quite smooth. The dorsal carina is 

 irregularly serrated. The ridge defining the cervical groove is smooth. In front 

 of the cervical groove two longitudinally-sinuous spinulose ridges define the 

 gastric region, and behind it two similar ridges traverse the branchial region. 



The abdominal terga and pleura, though having the surface non-granular 

 and the edges smooth, are sculptured, especially the 6th tergum. The first 5 

 terga are longitudinally carinated in the middle line, the carina of each ending 

 anteriorly in an antrorse spine : the 6th tergum has a lyre-shaped carina. 



The antennular scale is broadly triangular with the inner edge vertically 

 up-turned: its tip does not reach further than the end of the 2nd joint of the 



