ANT. ARC.] 



CRUSTACEA. 



529 



domen of six joints, as broad 

 as long, pleurae except the 

 second pointed; telson broad, 

 appendages to the penul- 



FIG. 961. Arithrnconectes mazonensis. a, b, c, Legs, 

 crushed and broken; Ji, ends of dorsal half of body 

 segments; m, hypostoma ; P, swimming paddle 

 broken; i, natural articulation; g, basal joints of 

 same; x, enlarged surface markings; M, mesial ap- 

 pendage of opercnlum; 1, 2, 3, articulations ; x, t, lat- 

 eral alse of opt-rculum ; s, s, accessory pieces; O, posi- 

 tion of mouih. 



FIG. 963. Anthracopalffimon 

 gracilis. Caudal parts and 

 one abdominal segment in 

 advance of the telson all 

 enlarged, a, Small, ter- 

 minal palette; d, d, two 

 accessory lamellse ; c, o, 

 lateral lamellae or fins. 



ANTHRACOPAL^MON, Salter, 1861, Quar. Jour. 

 Geo. Soc. 

 Lond., vol. 

 17, p. 529. 



~~^^N : teP*~~~ [Ety. on- 



^ 1 ' I v thrax, coal ; 



palsemon, 

 pr a wn .] 

 Carapace 

 scarcely as 

 broad as 

 long, sim- 

 ple, con- 

 vex, sides 

 arched out- 

 ward; cen- 

 tral ridge 

 in front 

 separated 

 by a furrow 

 from a cen- 

 tral ridge ; 



front margin serrate; outer antennae 

 have wide, square basal joints; second 

 and third joints not much oblique; 

 the rest about as broad as long; ab- 



FIG. 962. Anthracopaleemon 

 gracilip. Dorsal view some- 

 what enlarged. 



timate joint double on each 

 side, subtrigonal, broad, lat- 

 eral fins divided. Type A. 

 grossarti. 



gracilis, Meek & Worth en, 1865, 

 Proc. Acad. Nat. Sci. Phil., p. 50, and 

 Geo. Sur. 111., vol. 2, p. 407, Coal Meas. 

 hillanus, Dawson, 1877, Geo. Mag., vol. 4, 



p. 56, Coal Meas. 



APAKCHITES, Jones, 1889, Ann. and Mag. 

 Nat. Hist., 6th ser., vol. 3, p. 384. [Ety. 

 aparche, first.] In form like Leperditia, 

 but smaller and without ocular or muscu- 

 lar spot, and having no overlap on the 

 ventral margin. Type A. whiteavesi. 

 whiteavesi, Jones, 1889, Ann. and Mag. Nat. 

 Hist,, 6th ser., vol. 3, p. 384, Trenton Gr. 

 ARCH^OCAHIS, Meek, 1872, Proc. Acad. Nat. 

 Sci. Phil., p. 335. [Ety. arrhaios, an- 

 cient; Aram, shrimp.] Cephalothorax 

 about equaling 

 in length 3$ seg- 

 ments, subtrig- 

 onal, pointed in 

 front, truncated 



and sinuous Flo . 964.-Arcbocari8 ver- 

 posteriorly;ab- miformis. 



domen with six 



imbricating segments; telson as long 

 as 3 abdominal segments with a stylet 

 on each side. Type A. vermiformis. 



