BRIT]^SH FOSSILS. 



9 



,Eig. 5. Hypostome of a species of Remopleurides ; in all probability of one of the above 

 species, with which it is associated in the rock ; it shows the lateral indenta- 

 tions, but not the projecting outer angles ; they appear to be broken off. 

 Desertcreat, Tyrone. 



Tig. 6. Probably the same species, from Tramore, Waterford ; the lateral notches and 

 projecting outer angles are very perfect. 



Other British species of the Genus, 

 Section Eemopleueides. Glabella furrows quite obsolete, 

 ^p. 4. J?, platyceps, M'Coy, Synopsis Sil. Foss. Ireland, p. 44. 



i?. glabella {adhuc solum cognota) ut in prcBcedentibus, sed bis quam longd latiori, tuber- 

 culata. 



Locality. — Carrickadaggan and Greenville, Enniscorthy, county Wexford (M'Coy), in 

 Lower Silurian rocks. 



5. R. longicostatus, Portlock (1843), Geol. Rep. Tyrone, pi. 1. fig. 6. JR. longicapitatus^ 

 ib. fig. 5. 



Diagnosis. R. ovatus, glabella undique lineata magna rotundatd, nec totum capitis lata, 

 quam longd latiori, ad frontem inter oculos lata; genis modicis triangulatis, in spinas 

 longissimas paullo incurvatas extensis ; thoracis axi postice attenuato, antice nec pleuram 

 bis excedentiy segmentis octo primis inermibus (reliqua absunt) ; pleuris satis longis falcatis, 

 nunquam productis, fulcro proximo elevato. 



This fine species, with a rounded form of glabella, somewhat like the foregoing 

 species, has the eyes much less extended forwards, the portion between being very 

 large and broad. The pleurae too are as wide as the axis, or nearly so, and the 

 long head spines are produced backwards at least as far as the 8th body segment ; 

 beyond this, the specimen is imperfect. Fine wavy lines cross the glabella, and by 

 these even portions of the head may be distinguished from th^ R. Colbii and its 

 allies, which all appear to have this part smooth. R, longicapitatus, from the same 

 locality, is a glabella only, somewhat elongated by lateral pressure ; it agrees in all 

 the other characters with the present species. 

 Localities. — Tirnaskea, Tyrone, in sandy schist ; Tramore, Waterford, in dark slate ; 

 Chair of Kildare, county of Kildare, in limestone. Llandeilo or Bala Beds. 

 Sp. 6. R. obtusus, sp. nov. 



R. parvulus, glabella lyratd subconvexd elongatd, antice latissimd, oculis abbreviatis vix 

 curvatis ; tkorace (segmentis primis) pleuris laviter sulcatis axi paullo angustioribus, fulcro 

 haud eminente nec ad axin appresso. 



Although imperfect, this is evidently quite distinct from any of the rest ; the obtuse 

 and wide front of the glabella and the consequently reduced size of the eyes readily 

 distinguish it. The glabellar furrows are only just indicated, if at all existing. 

 The fulcral segments are remarkable, for the fulcrum, instead of being strong and 

 projecting, and placed close to the axis, is at some little distance from it, and does 

 not project more than in ordinary trilobites. 



Localities. — Desertcreat, Tyrone. [Survey Coll.] 



Section II. Caphtea. 



Glabella moderate, not inflated, with three pairs of furrows. 



Sp. 7. R. (Caphyra) radians. Caphyra radians (glabella solum). Barrande, Notice 

 Prelim. Syst. Sil. Boheme, p. 32. (1846). Sil. Syst. Boheme, 1853, pi. 43. fig. 33-39. 

 Amphitryon Murchisonii, Corda (1847), Prodr. Bohm. Tril., t vl f. 58. 



