1855.] HARKNESS FOSSIL FUCOIDS, ETC. 475 



from a slight examination of them, was disposed to regard them as 

 having some affinity to Oldhamia. Whatever may have been their 

 nature, they must have existed in great quantities in this locality 

 during the deposition of the muds and fine sands which now form 

 the shales and sandstones of this portion of the Lower Silurians, 

 since they are found in considerable abundance on the surfaces of the 

 strata in Barlae Quarry. 



Zoojihytes. 



1. Rastrites Barrandi, nov. sp. Axis apparently spirally 

 curved ; narrower than the cells. Cells arranged on the convex 

 margin, at the distance of about ^\h. of an inch from each other ; 

 slightly curved ; and, when perfect, more than f of an inch long ; 

 narrowest at the base. The cells show traces of tubular structure, 

 the result of a collapsing of their walls. 



This form is very distinct from the other species of Rastrites, 

 being well marked by the great length of the cells. 



Locality. — Occurs in the black shale immediately underlying the 

 anthracite in Glenkiln Burn, Dumfriesshire. Also found, though 

 rare, in the black slates of Cairn Ryan, Wigtonshire. 



2. Protovirgularia dichotoma, M*Coy ? * Among the fos- 

 sils which occur at Barlae is a zoophyte which appears to be nearly 

 allied to the P7'otovirgularia dichotoma of M'Coy . In some respects, 

 however, it differs from the species alluded to. The portions which 

 have been found at Barlae do not present the dichotomous branching 

 of M'Coy's species, nor indeed any branching at all, although the 

 length exceeds the specimens of his P. dichotoma, which show several 

 branchings. Probably this form from Barlae may be a new species, 

 devoid of branching altogether, or having its branches remote from 

 each other. The portions supporting the cells have the arrangement 

 which prevails in this genus. 



Locality. — Found very sparingly on the surfaces of the shales at 

 Barlae. 



Annelides. 



1 . Crossopodia Scotica, M'Coy f • The tracks of this Annehd 

 occur in great abundance on many of the faces of the strata at Barlae. 

 These tracks commonly appear in the form of a sinuous line, about 

 Y^o ths of an inch broad. The original state of the strata has fre- 

 quently prevented the cirrated lines, which mark this species, from 

 being recognized, as these strata were, when deposited, very fine mud 

 in an exceedingly soft state. Where the mud has been of a harder 

 nature, the cirrated markings are distinctly visible, and they present 

 all the characters of the form referred to. McCoy's specimens were 

 from near Inverleithen. 



* Palffioz. Foss. Cambr. p. 10. pi. IB. fig. 11, 12. 

 t Ibid. p. 130. pi. ID. fig. 15. 

 VOL. XI. PART I. 2 K 



