101 



LYCROPHYCUS HUDSONICUS. (N. sp.) 



Description. This species forms large fan-shaped tufts one foot wide, 

 consisting of long, branched, cylindrical, usually much curved stems from 

 2 to 3 lines in thickness. It resembles L. Ottwaensis, but differs in the 

 greater flexibility of the stems, the effect of which is to produce wide 

 straggling expansions instead of compact tufts. 



Locality and Formation. Manitouwaning Bay, Lake Huron ; in the 

 upper part of the Hudson River group. 



CoUector.'R. Bell. 



LlCROPHYCUS HlLTONENSIS. (N. Sp.) 



Description. This species consists of numerous sub-cylindrical straight 

 or curved stems, which spring from a common root, and are many times 

 branched above. The original stem divides close to the root into several 

 branches, each of which as it increases in length gives off new branches 

 at an acute angle, the new ones suddenly becoming of the thickness of the 

 old ; the latter usually more or less curved. The stems are in general 

 about half an inch in thickness. At five inches from the base fourteen 

 stems can be counted in one specimen on the surface of the rock, occupy- 

 ing a width of seven inches. The length of this group is nine inches. 



This species closely resembles B. succulens (Hall), Pal. N. Y. vol. 1, 

 PL 22, fig. 2a, but the stems are twice the size. The species figured on 

 PL 21 of the same work as an undetermined Palaeophycus appears to be 

 a fragment of this species. 



Locality and Formation. Near Hilton Village, Island of St. Joseph, 

 Lake Huron. Black River and base of the Trenton. 



Collectors. A. Murray, R. Bell. 



RUSOPHYCUS GRENVILLENSIS. (N. sp.) 



Description. This species is found in the form of irregular oblong-ovate 

 or depressed hemispherical masses, one end usually divided into two parts 

 by a furrow of more or less depth. The whole mass is generally crossed 

 numerous undulating wrinkles, which have a direction transverse to 

 it of the furrow. The more common dimensions are from 3 to 4 inches 

 in length, and from 2J to 3 in width, but occasionally specimens occur 

 much larger and also smaller. One of these is 9i inches by 5i, and in 



