BY T. HARVEY JOHNSTON AND OTTO S. HIRSCHFELD. 61 
‘The entire shell may be red brown to pinkish, interspersed 
with shades of green. The general colour is very like the 
brown variety of L. bancroftt. There is commonly a deposit 
of thick, almost black, readily removable, pigment on the 
surface of the valves, especially in the vicinity of the 
peduncle. The latter is rather long and fleshy, measuring 
from 110 to 155 mm. in length in our preserved specimens. 
A tube of sand covers only the cylindrical ampulla at its 
extremity. 
The sete are arranged at the free end as in JL. anatina 
while the laterals are short and the postero-laterals well 
marked. We were unable to detect pallial pigmentation 
in our material which had been preserved several years. 
Perhaps the densely calcified condition of the shell may be 
correlated with the lack of pigment, if this feature be normal. 
The arrangement of the musculature resembles in detail 
that figured (under the name JL. anatina) by Hancock 
whose excellent drawings show also the typical form of the 
ccelome as seen when either the dorsal or ventral valve is 
removed. 
The. intestine, which is relatively wider and thinner 
walled than in L. bancrofti, is thrown into a few wide loops 
differing in position from those of that species and JL. 
anatina. The anus lies somewhat dorsally on the right 
side anteriorly to the insertion of the oblique muscles. 
It is not situated on a distinct elevation and is, as a con- 
sequence, inconspicuous. The liver and gonads occupy 
positions as shown by Hancock. The nephridia are maroon 
coloured organs, covered in greater part by the gonads. 
Occasionally one notices specimens in which only a 
few of the pallial sinuses branch in the manner figured by 
Hancock (pl. 64, fig. 4) ; but in many cases, a fairnumber of 
the most anteriorly situated vessels divide up to a cousider- 
able degree, so that a plexus-like condition is seen. There 
may be frequent anastomoses. Between the anterior 
termination of each main sinus is a space which to the 
naked eye appears as a non-vascular whitish area, on 
account of the absence of prominent branches from the 
inner aspect of each terminal sinus. The majority of the 
outer vessels from each pallial sinus travel outwardly 
