304 REPORT— 1873. 



Seventh Report of the Committee appointed for the purpose of continuing 

 Researches in Fossil Crustacea, consisting of Professor P. Martin 

 Duncan {M.B. Land.), F.R.S., Henry Woodward, F.R.S., and 

 Robert Etheridge, F.R.S. Drawn up by Henry Woodward, 

 F.E.S. 



Last year at the Brighton. Meeting I was enabled to lay before the Association 

 a very considerable list of accessions to Fossil Crustacea, and also a goodly 

 account of work performed. 



A very fruitful season is not unfrequently succeeded by a smaller harvest. 

 Such is the case with my Report this year ; I am, however, able to show 

 some favourable results. 



Part Y. of my ' ilonograph on the Merostomata,' containing the suborder 

 XiPHOsuEA, will be ready for publication before the end of the present year. 



I have included in it the following genera and species, namely : — ■ 



Bellmurus Konigiantis, H. Woodw., 1872. Coal-measures, Dudley. 



hellulus, Konig. „ Coalbrookdale. 



reghKB, Baily. „ Queen's Co., Ireland. 



arcuatus, „ „ ,, ,, 



Pres(wickiaBirtwelli,s]y.iiov.,'n..Wooi\f. „ Lancashire. 



. — — anthrax, „ 18GG. ,, Coalbrookdale, 



— — rotundata, „ ,, ,, „ 



Iseolimichis falcafus, „ „ Upper Silurbn, Lanarkshire. 



I have also introduced into this Part of my Monograph those singular crus- 

 tacean forms which occur in the Carboniferous Limestone, both at Cork in 

 Ireland, at Settle and LoUand in Yorkshire, and at Yise, Belgium, referred 

 to the genus Cydus, namely : — 



Cyclus hilohatus, H. Woodw. Carboniferous Limestone, Ireland. 



tarosus, 



Wrighfii, „ 



• Hark7iessi, „ 



• radialis, Phillips, sp. 

 ■ Jonesiamis, H. Woodw. 



Yorkshire, &e. 

 Ireland. 



Eankini, „ Coal-shale, Carluke. 



{Ha!icy>ie)!axus,\on Meyer. Muschelkalk, Germany. 



{Halicyne)agnostns, „ „ „ 



These last are doubtless either larval forms of other Crustacea, or else they 

 belong to a pectiliar group whose appearance in time has been exceedingly 

 limited. They remain for the present among the unsolved problems of 

 palaiozoology. 



"Whilst referring to the fossil LimuU I would briefly allude to two valuable 

 contributions to the anatomy of the living Livndus, or " King crab," of the 

 north-east coast of iS^orth America : — one by my distinguished colleague 

 and chief, Prof. Owen (see Linnean Transactions, 1873, vol. xxnii. pt. iii. 

 p. 459, pis. xxxvi.-xxxix.) ; the other by Prof. Alphonse Milne-Edwards (in 

 the ' Annales des Sciences I^aturelles, Zoologie,' 5th series, tome xvii. 1873, 

 p. 25, pis. v.-xvi.). 



Limidus polypliemus, and the closely aUicd species common to the Moluccas 

 and the coasts of China and Japan, are the sole existing types of this ancient 

 race, whose longevity (as an order) in time is unsui-passed among the Crus- 

 tacea, save by the Entomostraca alone, NeoUmuhts of the Upper Silurian 

 of Lanark closely agreeing with the larval stages of the living Limxdus, 

 called by Dohm the "Trilobiten-Stadium." 



