86 



liąue ; carapace behind very straight ; beliind the middle there is a 

 very strong transverse ridge. Outer jaw-feet with the third joint 

 on the oatside straight, not dilated. Fore-legs small ; hind-legs 

 very long ; tarsus not particularly dilated, somevvhat elongated, 

 fringed \vith hairs, as is the preceding joint. 



This genus, which is shortly characterized above, belongs to the 

 family Grapsidce, being nearly allied to Trichopus, De Haan, which is 

 synonymous with Varuna, M. Edwards. 



Utica gracilipes, White, 1. c. p. 43. 



Front wide, fore-edge very straight ; behind it, and extending to 

 the middle of the carapace, there is a considerable, wide, somewhat 

 three-sided elevation, separated from the transverse ridge by a deep 

 lunated depression, from the ends of vvhich a slight impressed line 

 proceeds to the side of the ridge where it deepens ; legs very slender 

 and fringed with hair. 



This species is a native of the Philippine Islands, from which it 

 was first brought by Mr. Cuming. He found it in a freshwater 

 rivulet among the mountains of the island of Negros. Mr. Adams 

 found it also in the island of Mindanao, and from his journal has 

 given me the follovving description, taken from the crustacean when 

 alive : — 



" Carapace dark liver-colour ; legs reddish brown ; under surface 

 dark brown, on the legs \vith a lighter tinge ; abdomen also of a 

 lighter colour, with a yellovvish line down the middle. $ . Freąuents 

 the deep, still, muddy freshwater rivers of the island of Mindanao, 

 hiding under ■vveeds and rotten wood. When caught this singular 

 crustacean feigns death, eontracting its limbs and rendering them 

 rigid, as if it were in a catalepsj\" 



5. Descrii'tions of several Ne'w Species of Spondylus. By 



G. B. SoWERBY, JUN. 



Spondylus unicolor. Spond. testd solidd, obliqui ovali, rubro- 



violascente ; costis 6 principalibus, squamis crassis, arcuatis ; 



subtūs concavis, paululilm palmatis, prope marginėm numerosis ; 



costis interstitialibus spinis crassis, brevibus, arcuatis ornatis; 



inter costas suleis nonnullis. 

 Hab. ? Mus. M. Griiner; G. B. Sovrerby. 



Spondylus Cumingii. Spond. testd liberd, regulari, subrotundatd, 



subdepressd ; ared cardinali parvd ; costis principalibus 6 elevatis, 



IcEvibus, squamis subelongatis, Imvibus, arcuatis, palmatis, ad 



latera palmarum undulatim fimbriatis ; interstiliis imbricatim stri- 



atis; colore fusco rubescente. 



A free-growing species, with short cardinal area, in some degree 



resembling 5. regius and S. imperialis, but most remarkable for the 



beautiful manner in vvhich the arched palmated scales are frilled and 



fluted at the sides. 



Hab. ? Mus. H. Cuming. 



