380 PROCEEDmGS OF THE GEOLOGICAL SOCIETY. [DcC. 1, 



Prof. Hall in his volume ; but believing, as I do, that both the 

 figures above quoted belong to one species, I do not see enough in 

 the more elongated form of our fossil to induce me to describe it 

 as more than a variety. 



In the ventricose and slightly angular whorls there is the closest 

 resemblance ; but, if their greater number and the consequent more 

 tapering form of shell be considered as specific, it may retain the 

 name M. gracillima, and will stand as a representative species. 

 The length of our largest specimen is 1 inch 4 lines, and in that 

 length there are 14 volutions ; in a Canadian one of the same length 

 not above 10 or 11. As we have not the exterior, it is safest to 

 leave it as a variety. 



MUECHISONIA ANGULOCnfCTA, SpCC. UOV. PI. XIII. figS. 9, 10. 



M. vix uncialis angustissima, anfractibus numerosis brevibus transversis peran- 

 gulatis, angulo submediano ; ore rotundato. 



' This is decidedly a different species from the last, and, though 

 imperfect, possesses sufficient external character to allow us to 

 distinguish it by a name. 



It is far more elongate than M. gracilis, and of more numerous 

 whorls than any species yet described, having, in a length of | inch, 

 13 whorls, all of which are angulated, the upper ones strongly so. 

 The angle is rather below the middle of the whorl, and the upper 

 portion is somewhat concave, while the base is convex beneath it. 

 Mouth rounded. The specimens are much worn. 



MUECHISONIA BELLICINCTA, Hall? PL XIII. fig. 11. 



(Palseont. New York, vol. i. pi. 39. fig. 1.) 



The specimens are too imperfect positively to identify this shell ; 

 but the size and proportions are very much like those of HaU's 

 species, especially his figs. 1 a to Id: fig. 1 e seems much more 

 elongated. 



BEACHIOPODA. 



Oethis steiatula, Emmons. PL XIII. figs. 14-16. 



(0. testudinaria, Memoirs Geol. Surv. vol. ii. pt. 1. pi. 27. fig. 8.) 



Three specimens only have occurred of this characteristic Llan- 



deilo-flag species. They are of the same size as those in Allumette 



Island, Canada, and more convex than usual in the species. 



ANNELIDA. PL XIII. figs. 28-31. 



In the quartz-rock of Durness, beneath the limestone, the abun- 

 dant annelide -tracks have been already referred to (p. 366 & 368). 

 It is only necessary to explain the figured specimens. Eig. 28 is one 

 of the ordinary vermicular impressions so generally referred to worm- 

 tracks or -burrows. In the present instance this is rendered more 

 likely by the occurrence of some of the matter of the tube itself as 

 a thin glossy film. 



Fig. 29 represents a pair of those double burrows which are 

 characteristic of shallow-water deposits through all the Palaeozoic 



