NIAGARA GROUP. 



143 



532. 2. LIMARIA FRUTIC0SA1 



Pl. XXXIX. Fig. 5 a, h. 



Compare Limaria fruticosa, Steininger, Mem. Soc. Geol. France, 1, p. 339. 



— — Lonsdale : Murchison, Sil. System, pag. 692, pi. 16 bis, fig. 8. 



Coral branching, subpalmate ; stems compressed ; cells opening by a triangular aperture, 

 interiorly subquadrangular, often solid and giving a prismatic structure to the stems. 



Fig. 5 a. A fragment of the natural size, showing a disposition to branch in a palmate form, the 



section above showing five distinct centres, from which the cells radiate. 

 Fig. 5 b. A portion of the surface of the same enlarged. 



Position and locality. In the lower part of the limestone at Lockport. 



533. 3. LIMARIA LAMINATA {n. sp.). 



Pl. XXXIX. Fig. 6a -d. 



Coral massive or lamelliferous, composed of angular tubes ; apertures of cells sinuate or 

 angular, separated only by the walls of the cells ; base of the cells triangular. 



This specimen is a small fragment of a massive species : it is composed of interrupted 

 laminae, presenting an irregular surface covered with angular openings of the cells. The en- 

 veloping laminse are often interrupted at intervals, and enclose between them depositions of 

 inorganic matter. 



This species is referred to the Genus Limaria, from the form of the apertures of the cells 

 and of the flattened angular tubes shown in a vertical section, which are precisely similar to 

 those of L. ramulosa. 



Fig. 6 a. The uneven upper surface, showing the apertures of the cells. 



Fig. 6 b. A vertical section, showing the interruption in the growth of the enveloping laminae. 



Fig. 6 c. The apertures of the cells enlarged, when little worn. 



Fig. 6 d. The apertures of the cells as they appear when much worn. 



Position and locality. In the lower part of the Niagara limestone at Lockport. 



