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.— Anthraconectes mazonensis. a, b, c, Legs, 

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

 segments; m, hypostoma; i*, swimming paddle 

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

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



Fio. 963.— Anthracopalsemon 

 gracilis. Candal parts and 

 one abdominal segment in 

 advance of the telson— all 

 enlarged, a, Small, ter- 

 minal paletie; d, d, two 

 accessory lamellae; c, c, 

 lateral lamella? or fins. 



same; z, enlarged suriace marmngs; m, mesial ap- 

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

 eral alse of operculum ; s, s, accessory pieces ; 0, post 

 tion of mouth. 



Anthracopal^mon, Salter, 1861, Quar. Jour. 

 v . Geo. Soc. 



; :/ Lond., vol. 



17, p. 529. 

 [Ety. an- 

 thrax, coal ; 

 palsemon, 

 prawn.] 

 Carapace 

 scarcely as 

 broad as 

 long, sim- 

 ple, con- 

 vex, sides 

 arched out- 

 ward; cen- 

 tral ridge 

 in front 

 separated 

 Anlhracopaleemon byafurrow 



Dorsal view some- from a een- 



what enlarged. 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. 

 gracilis 



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. 

 Apafchites, Jones, 1889, Ann. and Mag. 

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

 aparche, first.] Inform like Leperditia, 

 but smaller and without ocular or muscu- 

 lar spot, and having no overfap on the 

 ventral margin. Type A. whiteavesi. 

 whiteavesi, Jones, 1 889, Ann. and Mag. Nat. 

 Hist., 6t!i ser.,vol. 3, p. 384, Trenton Gr. 

 ARCHiEOCABis, Meek, 1872, Proc. Acad. Nat. 

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

 cient ; karis, shrimp.] Cephalothorax 

 about equaling 

 in length 3$ seg- 

 ments, subtrig- 

 onal, pointed in 

 front, truncated 



and sinuous FlQ . 964 ._ A rc i I£ eocarls ver- 

 posten orl y ; ab- mif orm is. 



domen with six 



imbricating segments; telson as long 

 as 3$ abdominal segments with a stylet 

 on each bide. Type A. vermiformis. 



