SÜBCLASS II 



EUCRUSTACEA— PERACAEIDA 



757 



Fig. 1467. 



H. Woodwtird to possess a brood-pouch formed of overlapping oostegites, 



and may therefore be referred, with little doubt, to the Mysidacea. 



Crangopsis Salter, from the Lower Carboniferous 



of Scotland and the base of the VVaverly in 



Kentucky is placed here by Ortmann, since it 



has the posterior thoracic somites distinct beneath 



the carapace. Anthrapalaemon Salter (Fig. 1467), 



Pseudogalathea, Tealliocaris, and Palaemysis Peach, 



all from the Carboniferous, have also been referred 



to this Order. 



Order 4. ISOPODA Latreille.i 



Body usually hroad and dep-essed. Carapace 

 absent ; first thoracic somite, rarely also the second, 

 fused with the head. Abdomen short, the last somite 

 almost always coalesced with the telson. Eyes sessile. 

 Thoracic limbs without exopodites. Abdominal limbs 

 lamellar, branchial. , ,, , •,. ,c ^w 



' Anthrapalaemon gracilis M. and W. 



Of the earlier fossils that have been referred ?£. .ATXr»ieä"a°ntwor*™r' 

 to this Order, Oxyuropoda Carpenter and Swain 



(Fig. 1468), from the Devonian of Ireland, 

 has the strongest claim to be regarded 

 as an Isopod. Its appearance earlier 



^ Literature : A. On Recent Forms. — Beddard, 

 F. E. , Report on the Isopoda. Sei. Resiilts Challenger 

 Exped., Zool., xL, \^Sh.— Hansen, H. /., Isopoden, 

 Cumaceen und Stomatopoden der Plankton-Expedition. 

 Ergebn. Plankton- Exped., ii., 1895.— /^ew, On the 

 Family Sphaeromidae. Quart. Journ. Microsc. Sei., 

 1905, n.s. vol. xlix. — Miers, E. /., Revision of the 

 Idoteidae. Journ. Linn. Soc. London, 1883, vol. xvi. 

 — Richardson, H. , Monograph on the Isopods of North 

 America. Bull. U.S. Nat. Mus., 1905, vol. liv.— 

 Sars, G. 0., An aecount of the Crustacea of Norway, 

 vol. ii. Isopoda. Bergen, 1896-99. 



B. On Fossil Forms. — Ammon, L. von, Beitrag zur 

 Kenntniss der fossilen Asseln. Sitzungsber. Bayer. 

 Akad. Wiss., 1?>%2.—Andree, K., Zur Kenntniss der 

 Crustaeeen-Gattung Arthropleura Jordan. Palaeontogr., 

 1910, vol. Ivii.— Carter, /., On fossil Isopods. Geol. 

 Mag., 1889, dec. 3, vol. vi. — Edwards, H. Milne, Sur 

 deux crustaces fossiles. Ann. Sei. Nat. Zool., 1843, 

 ser. 2, vol. xx. — Idem, On Archaeouiscus. Ann. Mag. 

 Nat. Hist., 1844, ser. 2, vol. xm.—Kunth, A., 

 Crustaceen von Solenhofen. Zeitschr. Deutsch. Geol. 

 Ges., 1870, vol. xx\\.— Meyer, H. von, Ueber Palaeo- 

 niscus obtusus. Palaeontogr., 1858, vol. v. — Racovitza, 

 E. G., and Sevastos, R., Proidotea haugi, n.g., n.sp., 

 etc. Arch. Zool. Exper. Paris, 1910, ser. 5, vol. vi.— 

 Reines, M., tJber Palaeosphaeroma tihligi, etc. Beitr. 

 Paläont. Geol. Österr. - Ungarn, 1903, vol. xv.— 

 Woodward, H., Several papers in Trans. Woolhope 

 Field Club, 1870 ; Geol. Mag., 1870, dec. 1, vol. vii. ; 

 1890, dec. 3, vol. vii. ; 1898, dec. 4, vol. \.—Idem, 

 On Squilla, etc. Quart. Journ. Geol. Soc, 1879, vol. 

 XXXV. — Carpenter G. H., and Sioain, /., A Devonian 

 Isopod. Proc. Roy. Irish Acad., 1908, vol. xxvii. 



Fio. 1468. 



Oxyuropoda ligioüles Carp. and Swain. Upper 

 Cid Red Sand.stone ; Kiltorcan, Ireland. a, 

 Portion of antenna ; c, Chela (?) ; o, Eye ; p, 

 Segment of body-limb ; u, Uropod ; 1-7, 

 Thoracic segments ; i.-vi., Abdominal segments. 

 Vi (after Carpenter and Swain). 



