REPORT ON THE CRUSTACEA MACRURA. 



lxxxiii 



The general distribution is shown in the following table :- 



Ibaccus hrevipes, 

 „ pares, . 

 „ perouii, 

 „ verdi, . 



Themis orient alls, 

 Irctus immaturity 

 „ oriental-is, 

 „ pygmxHS, 

 „ mgasus, 

 „ sordidus, 

 „ tuberculatus, 

 ,, ursus, 

 Scyllarus ecquinoctialis, 

 „ latus, . 

 „ sculptus, 

 „ squamosum, 



New Guinea. 



Antilles. 



Australia. 



Cape Verde Islands. 



Seychelles Islands and the Indian Ocean. 



Cape Verde Islands. 



Philippine Islands. 



Canary Islands. 



India. 



Hong Kong. 



New Guinea. 



Europe. 



Antilles. 



Canary Islands. 



Antilles. 



Numerous species of the genus Eryon have been found in the Lias of England, 

 Normandy, and the Upper White Jura of Bavaria. This family is numerously represented 

 in our recent fauna, the whole of the species being inhabitants of the deeper parts of the 

 ocean ; generally preferring to dwell where the bottom is mostly covered by Globigerina 

 ooze, excepting in the case of the genus Stereomastis, which lives on a muddy bottom in 

 the narrow channels between the mainland and the numerous islands on the western 

 coast of Patagonia, at a depth of 200 to 600 fathoms. Species of the recent genus 

 Willemcesia are to be found in Mid, North, and South Atlantic, as well as in Mid Pacific, 

 at a depth of about 2000 fathoms, while Pentacheles and Polycheles are met with at 

 from 100 to 1000 fathoms in channels among the Polynesian Islands, as well as in the 

 West Indies, whilst another representative form, Eryoneicus, exists among the Cape 

 Verde Islands. 



The genus Hoploparia of the Green Sand and London Clay, appears to be represented 

 in our recent Hornaridse ; so much so that Hoploparia longimana from Lyme Eegis 

 corresponds so closely with Nephropsis rosea as to appear to be only a smoothly rostrated 

 species of the same genus, and both bear a near resemblance to a young Homarus, from 

 which they differ in having no scaphocerite and smaller ophthalmopoda. 



Different species of Nephropsis have been found in the North Atlantic, the West 

 Indies, the South Atlantic, and the Celebes Seas, all of which possess the remarkable 

 feature in common •with the fossil form of having no scaphocerite, and the ophthalmopoda 

 are also reduced to a rudimentary condition. 



The consideration of these species gradually leads to that of another family of no 

 very different structural character, but with very distinct surroundings. Instead of 

 inhabiting the deeper recesses of the sea, the group Astacidea inhabits the fresh-water 



