MACRUROTJS DECAPOD IN THE LOWER, CARBONIFEROUS. 869 



Carboniferous Limestone group near Paisley, and was provisionally- 

 described by Prof. Huxley as referable to his type species P. 

 Cooperi *. 



1863. Prom the Devonian beds of St. John's, Nova Scotia, Mr. 

 Salter described a Crustacean, which he surmised might be a Stoma- 

 pod, with an oblong-oval carapace rounded in front, a thorax of 

 9 (?) segments, and a semicircular tail-piece, as Ampliipeltis para- 

 doxus f. Another form, of which the carapace is unknown, is 

 represented by five segments and a large triangular and spinous tail- 

 piece, with two pairs of simple ovate appendages, for which is pro- 

 posed the name of Diplostylus Dawsoni %, It appears to be an 

 Isopod, allied to the recent Spkoeroma, and also to the Hyperina- 

 group amongst the Amphipods ; it is from the Coal-measures of the 

 South Joggins, Nova Scotia. 



When proposing Palaiocrangon for the Pifeshire Uronectes ? socialis, 

 Mr. Salter overlooked the previous adoption of this name by Baron 

 von Schauroth for a distinct Permian fossil ; he therefore, in the 

 paper now under consideration, changed it to Grangopsis §. 



1863. Mr. Salter, again, contributed another memoir towards our 

 knowledge of the older higher Crustacea — "On a New Crustacean from 

 the Glasgow Coal-field" ||, in which was described Palctocarabus Pus- 

 sellianus, from the Palace-Craig Black-band Ironstone (Coal-mea- 

 sures)^. Palceocarahus, previously described as a subgenus oiAnthra- 

 palamion, was here raised to generic rank, and was distinguished from 

 the latter by having a complete cervical furrow and ridge, as against 

 a faint cervical furrow and incomplete ridge in Anthrapalcemon. In 

 both the ridge is produced anteriorly into a thick serrated spine. 



1865. In a " Notice of some New Types of Organic Remains from 

 the Coal-measures of Illinois," Messrs. Meek and Worthen describe 

 two genera which must be noticed here, Acantliotelson and Palazo- 

 caris**. In the former the thoracic and abdominal segments, except 

 the last, do not differ materially in length, and each is shorter than 

 the head. The telson is simple, long, and spiniform f f. In the 

 second form the head is about as long as the first two abdominal 

 segments, and the telson long, tapering, and horizontally flattened. 

 According to Messrs. Meek and "Worth en, Acantliotelson combines 

 the characters of the Amphipoda and Isopoda, and should, perhaps, 

 be placed in Dana's intermediate group the Anisopoda, amongst the 

 Tetradecapoda. Palceocaris is also provisionally placed in the 

 Tetradecapoda, although it may perhaps be a low type of the Deca- 

 poda. There is no trace of a carapace ; the thorax is divided into 

 seven segments, like those of the abdomen, and each is provided with 

 a pair of legs. 



* " On a Stalk-eyed Crustacean from the Carboniferous Strata near Paisley," 

 Quart. Journ. Geol. Soc. xviii. p. 420. 



t " On some Fossil Crustacea from the Coal-measures and Devonian Bocks 

 of British North America," Quart. Journ. Geol. Soc. xix. pp. 75 & 79, f. 11. 



} Loc. cit. pp. 77 & 79, f. 6. § Ibid. p. 80. 



|| Quart. Journ. Geol. Soc. xix. p. 519. % Ibid. p. 520, f. 1 & 2. 



** Proc. Acad. Nat. Sciences, Philadelphia, 1865, pp. 46 & 48. 



tt Ibid. p. 50. 



Q.J.G.S. No. 132. 3l 



