868 K. ETHERIDGE, JUN., ON THE OCCURRENCE OF A 



circular disk, . . . the opposite end has the appearance of a quadrate 

 disk." Between these two disks " lies the central portion of the 

 body, divided into a series of segments. Two pairs of appendages, 

 one large and one small, are attached to the extremity of the 

 quadrate disk, while a number of slender limbs are connected with 

 the sides of the segmented part of the body." 



1859. Mr. C. Spence Bate, in a paper " On the Fossil Crustacean 

 found in the Magnesian Limestone of Durham by Mr. J. W. Kirkby "*, 

 reconsiders the affinities of Palceocrangon (Prosoponiscus) pro- 

 blematicus, and refers it to the Amphipoda near to Phcedra antiqua, 

 S. Bate, rather than to the Isopoda. 



1861. Attached to the llev. T. Brown's paper " On the Mountain 

 Limestone and Lower Carboniferous Rocks of the Fifeshire Coast "f, 

 Mr. J. W. Salter gave a description and figure of a shrimp-like 

 Crustacean, Uronectes socialis, found by Mr. Brown in the Ardross 

 Limestone, near Elie, Fife, and considered it to be allied to Gamp- 

 sonycJius Jimbriatus, Jordan, but with much fewer segments. There 

 are seven body-rings and a minute telson, with a few scattered 

 appendages. The head was elongated. 



1861. A revision of the higher Carboniferous British Crustacea 

 was given by Mr. Salter $, in which he established the genus Anthra- 

 palcemon for a Crustacean from the Lanarkshire Coal-field, A. Gros- 

 sarti, Salter §. The carapace is well marked, with a strong central 

 ridge, projecting anteriorly into a thick spine ; and the front margins 

 are serrate. The outer antennas have wide square basal joints. The 

 abdomen consists of six somites, broad and short. A second species of 

 Anihrapalcemon is figured ||, of a more elongated form, with a 

 smooth carapace. Under Anihrapalcernon was established a sub- 

 genus, Palceocarabus, for the reception of Apus dubius, Prestwich^f. 

 Mr. Salter further showed that one of the specimens exhibited to 

 the Society many years ago by Dr. Ick was identical with Palceo- 

 carabus dubius, and that the other was the afterwards described 

 Pygocephalus Cooperi, Huxley. Finally, for the shrimp-like Crus- 

 tacean from the Fifeshire Lower - Carboniferous beds (Uronectes? 

 socialis), the name Palceocrangon was proposed**. The carapace is 

 short and pointed, and the telson small, with narrow and obovate 

 caudal appendages. The much smaller number of somites, 6 or 7, 

 separates Uronectes? socialis from Gampsonychus jimbriatus, irrespec- 

 tive of other characters. With regard to Gitocrangon of Uichter, 

 Mr. Salter apjjears to have doubted its Crustacean character at all, 

 and remarks of the Fifeshire fossil, that " no Decapod had up to that 

 time been found in the lower shales of the Carboniferous." 



1862. A second example of Pygocephalus was found in shale 

 about three fathoms above the Hurlet or Nittshill Coal of the Lower 



* Quart. Journ. Geol. Soc. xv. p. 137, pi. vi. 

 t Trans. Royal Soc. Edinburgh, xxii. p. 385. 



X " On some of the Higher Crustacea from the British Coal-measures," 

 Quart. Journ. Geol. Soc. xvii. p. 528. 



§ Tom. tit, p. 530 & p. 531. f. 1-4. || P. 531, f. 5. 



T P. 532 & p. 531. f. 6 & 7. ** P. 533 & p. 531. f. 8. 



