SUBCLASS II 



EUCRUSTACEA— PERACARIDA 



757 



H. Woodward to possess a brood-poiicb 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 Waverly in 



Kentucky is placed here by Ortmann, since it 



has the jDOsterior 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.^ 



Body usually broad and depressed. 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. , „ , ' '•,■,,„ ,, w 



' Anthnipalneinon gractlis M. ana W. 



Of the earlier fossils that have been referred ^°^l fl^^^j^^^^v^^^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 



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

 F. E. , Report on the Isopoda. Sci. Results Challenger 

 Exped., Zool., xi., IS85.— Hansen, H. J., Isopoden, 

 Cumaceen and Stomatopoden der Plankton-Expedition. 

 Ergebn. Planktou-Exped., ii., 1895.— /(fe?», On the 

 Family Sphaeroniidae. Quart. Journ. Micrpsc. Sci., 

 1905, n.s. vol. xlix. — Miers, E. J., 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 account of the Crustacea of Norway, 

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



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

 Kenntniss der fossilen Asseln. Sitzuugsber. Bayer. 

 Akad. Wiss., \^%2.~Andree, A'., Zur Kenntniss der 

 Crustaceen-Gattung A rthroiileura Jordan. Palaeontogr., 

 1910, vol. W\\.— Carter, J., On fossil Isopods. Geol. 

 Mag., 1889, dec. 3, vol. vlSdwards, H. Milne, Sur 

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

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

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

 Crustaceen von Solenhofen. Zeitschr. Deutsch. Geol. 

 Ges., 1870, vol. x\\\.— 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.— 

 Renus, M., tjber Palaeosphaeroma uhligi, etc. Beitr. 

 Palaont. Geol. Osterr. - Ungarn, 1903, vol. xv.— 

 Woodward, H., Several papers in Trans. Woolhope 

 OxvuropoM im^nJcsC^v and Swain. Upper Field Club, 1870 ; Geol. Mag 1870 dec 1, vol. vii. ; 

 Old Red Sandstone ; Kiltorcan, Ireland, a, 1890, dec. 3, vol. vu. ; 1898, dec. 4, vol. \.~Jdem, 

 Portion of antenna; c, Chela (?) ; o, Eye; p, On Squilla, etc. Quart. Journ. Geol. Soc, 1879, vol. 

 Segment of body-limb ; « Uropod ; 1-7, xxxv.—Carpewto' G*. .ff., and ;S!wm(,, /., A Devonian 

 Thoracc segments; 1. -VI., Abdommal segments. /^ •• ^";'^ t-i a „i iqhq ,^.1 v^,-;; 



i/i (after Carpenter and Swain). Isopod. Proc. Roy. Irish Acad., 1908, vol. xxvii. 



Fig. 1408. 



