Dr. C. F. Lixthen — On the Ophiuridce. 



79 



owing to iho contortions of (lio Kirala in wliicli tlicso two zones 

 occur, their precise relations are not (ihnirly uiulerstood. 



I ap2)en(I a list of the fossils of Duiufrit^ssliin!, in which a few 

 species, not previously recorded, are included. It will be seen that 

 there are a greater number of Llandeilo species than of Caradoc. 

 many being common to the two formations elsewhere; and that 

 there are very few Arenig (or Lower Llandeilo) forms. Many 

 species have not, as yet, been found elsewhere. 



OraptolitiiJiv TIydrozoa. 



Cori/iioidis cii/icHl'iHs, Nich, 



Retiolitvs pcrlalus, Nich. 



Gropiolilithc. 



Rastritcs capillaris, Carr. 



,, Limxvi, Burr. 



,, maximns, Carr. 



,, pere.grinus, IJarr. 

 Oraptolilhus convolutusy His. sp. 



„ Cliiigani, Carr. 



„ Halli, Barr. 



„ Eisingeri, Carr. [Linn.) 



{ = G. Sagittarius^ His. sp. non 



„ intermedins, Carr. 



„ lobiferus, M'Coy. 



( = G. Becki, Barr.) 



,, Nilssoni, Barr. 



„ Sedgwickii, Portl. 

 Didymograpsus elegans, Carr. 



,, For clt hammer i, Gein. sp. 



,, Moffalensis, Carr. 



\=D. anceps, Nich.) 

 Cladograpsus capiUaris, Carr. 



,, linearis, Carr. 

 Helicograpsus gracilis, Hall, sp. 

 Hiplograpsus angiistifolius, Hall, sp. 



,, himucronatus, Nich. 



„ dentatus, Brong. sp. 



„ (=-^- pristiniform,is, Hall.) 



,, folium, His. sp. 



„ minutus, Carr. 



„ muc7:onatus. Hall, sp. 



„ ifisectiformis, Nich. 



Diplograpsus palmeus, Barr. 



,, pcmi'i, Hopk. 



„ pristis, JJis. sp. 



„ pusillus. Hall, sp. 



,, tamariscus, Nich. 



,, tricornis, Carr. 



„ vcsiculosHs, Nich. 



,, Whitfieldi, Hall, sp. 

 Cephalograjjsus cometa, Gein. sp. 

 Glimacograjitus hicornis. Hall. 



,, minutus, CaiT. 



( = C. innotatus, Nich.) 



„ scalaris, Linn. 



( = C. teretiusculus, His. sp. 



,, iubercidaius, Nich. 

 Dicranogrnplus CUngani, Carr. 



,, ramosus. Hall. 



ACTINOZOA ? 



Frotovirgularia dichotoma, M'Coy. 



Brachiopoda. 

 Lingula attenuata, Sby. 



„ brevis, Portl. 

 Siphonotreta micula, M'Coy. 



Annelida. 

 Crossopodia Scolica, M'Coy. 

 Bexolites gracilis, Hopk. 

 Nereites Cambrensis, M'Coy. 

 Tentaculites, sp. 

 Trichoides ambigtcus, Harkn. 



Crustacea. 

 Discinoearis Broivniana , Wootlw. 

 Feltocaris aptyclioides. Salt, 



„ Harknessi, Salt. 



isroTioiBS oip 3vn:E3Dvi:oiias. 



I. — Notes on the OpHiiiEiD.a!. 

 By Dr. C. F. LiixKEN, of tlie Zoological Museum in the TJniversity of Copenhagen. 



[Additnmenta ad historiam Ophiuridarmn. Part 3. 1869. From the Transactions 

 of the Royal Danishi Academy of Science. Communicated by the Author.] 



IN this paper I have given a general synopsis of all hitherto 

 established genera of recent Ophiuridce, with their chief charac- 

 ters in Latin, and a critical essay on the genera of fossil Ophiuridce. 

 This section of Palaeontology is yet in a very unsatisfactory condition, 

 owing partly to the unscientific manner in which D'Orbigny cha- 

 racterized his genera. Thus the genus OpMurella, Ag., is established 

 on 0. speciosa, Miinst. (from the Lithographic Limestone), and is 



