261 
small and new Phyllopod Crustacean. 
posteriorly; dorsal margin straight, ventral gradually rounded; 
convexity of valves unknown. Umbo inconspicuous in the 
crushed state. Surface ornamented with numerous (18-20) 
sharp concentric ridge-lines, and divided into two very un¬ 
equal portions by a ridge proceeding vertically from the umbo 
to the antero-ventral curve, gradually losing its marked cha¬ 
racter as the umbo is receded from. The smaller of the two 
spaces is roundly triangular, and sometimes intruded on by 
an accidental fold due to pressure ; the larger, comprising the 
greater part of each valve, is almost quadrate or oblong in 
form, allowing for the rounded infero-posterior margin. 
Fig. 1. Fig. 2. 
Fig. 1. A valve in which the posterior end has been destroyed; anterior 
to the ridge from the umbo is a furrow caused by pressure. It is 
quite distinct from the ridge. 
Fig. 2. Another valve, with the rounded posterior end somewhat defi¬ 
cient ; the same fold occurs here. 
The figures are magnified to about eight times the natural size. 
The specimens are contained in the Geological-Survey-of-Scotland 
collection. 
Ohs. Exclusive of the single ridge existing in the present 
species, it has much less angularity of outline than L. Leidyi, 
Lea, and somewhat less than L. tricarinata , M. & W., and in 
this respect corresponds more closely with L. wettinensis. It 
is longer than L. Baintschiana. 
Form, and Loc. Shore of the Firth of Forth at Gran ton 
Quarry, near Edinburgh, in a fine-grained shale of the Wardie- 
Shale group, Lower Carboniferous or Calciferous-Sandstone 
series. Collection of the Geological Survey of Scotland. 
Collector. Mr. James Bennie. 
I have to express my thanks to Prof. A. Geikie, F.R.S., 
for permission to make use of the specimens, and to Prof. T. 
Rupert Jones, F.R.S., for material assistance in working out 
the form here described. 
Ann. cf- Mag. N. Hist. Ser. 5. Vol. iii. 
18 
