16 DR. J. E. MAEE OX THE LOWER [March I913, 



Remoplettrides (sensu stricto) sp. 2. — Two fragments of heads 

 from the limestone of Backside Beck, at its junction with Watlev 

 Gill, belong to this subgenus. They are marked by a very broad 

 neck-ring. They are also marked by transverse wavy lines like those 

 of the last form. 



Remoplettrides sp. — A large form occurs in beds of doubtful age, 

 at the footbridge to Murthwaite over Sally Beck. One has eight 

 body-segments preserved, the other nine and a fragment of the 

 pygidium. It is interesting to note that one of two specimens 

 found has a broad, the other a narrow, axis, as is so frequently the 

 case with species of this genus. 



Ill^entjs sp. — A pygidium from Taythes Gill does not appear to 

 agree with that of any described British species. It closely re- 

 sembles an unnamed form figured by Prof. Brogger from the 

 Ordovician beds of Espehoug, in the Trondhjem district. 1 



(3) Fossil from the Cyrtogra/jtus-murchisoni Zone 

 (Wenlock). 



Arethtjsixa sp. — The discovery by my son of a head from the 

 Cyrtograptus-murchisoni Zone of Middle Gill adds another record 

 for this rare British form. It had previously- been recorded by 

 Mr. F. R. C. Reed from the Balclatchie Beds of Girvan. 2 He refers 

 this doubtfully to Barrande's A. Iconinclci. In addition to that 

 species, we know A. nitida Barr. from the Ludlow Beds of Bohemia, 

 a pygidium only being figured ; A. sandbergeri, also described by 

 Barrande from the Devonian beds of Hagen (Westphalia) 3 ; a form 

 referred to A. Iconinclci from the Retiolites Beds of Dalecarlia 4 ; and 

 one described by Prof. Freeh under the name of A. haueri. 5 This 

 last is a Silurian form, but its exact horizon is a matter of dispute. 

 It comes from an Orthoceras Limestone at Kok in the Eastern Alps, 

 -which is equivalent to part of our Wenlock or Lower Ludlow 

 Beds. 



Prof. Tornquist notes some minor variations between his form 

 and the typical Bohemian Iconinclci. Prof. Freeh's species is stated 

 to differ from Iconinclci by its considerably arched glabella, its 

 rounded cheeks, the transverse furrows on the further side of the 

 glabella (which do not reach the eyes), and the smaller margin of 

 the head-shield. Our form resembles Freeh's (and also Tornquist's?) 

 in the arched glabella ; but it differs from A. haueri in having the 



1 W. C. Brogger, ' Om Trondjliemsfeldtets midlere Afdeling mellem 

 Guldalen & Meldalen ' Vidensk.-Selsk. Forhandl. (Christiania) 1877- 



2 ' Lr. Palaeozoic Trilobites of Girvan ' pt. 2, Monogr. Palteont. Soc. vol. lviii 

 (1904) p. 84. 



3 J. Barrande, ' Eeapparition du Genre Arethusina Barr.' Prague, 1868. 



4 S. L. Tornquist, 'Undersokn. ofver Siljansoinradets Trilobitfauna' Svei\ 

 Geol. Undersokn. ser. C, No. 66 (1884) p. 51. 



5 F. Freeh, Zeitschr. Deutsch. Geol. Gesellsch. vol. xxxix (1887) p. 736. 



