Spermatophores in Panulirus and Paribacus. 187 
have in the proper position for a thumb a minute spine, about one 
mm long in a male of 40 cm; which has a horny tip and some 
suggestions of setae so that it is comparable to a thumb, in a sense, 
though of a most rudimentary character. Generally the distal seg- 
ment of the leg has no corre- 
sponding suggestion of claw 
structure, yet in some cases 
there is a distinet, though 
very slieht, elevation oppo- 
site the above thumb rudi- 
ment and this elevation bears 
several blunt setae. 
In the most advanced 
condition of the male claw 
that was seen the above con- 
dition was found on the one 
side of the body while the 
other had the more advanced 
form to be described below 
and shown in Fig. F. This 
lobster was very large and 
presumably old, weighing 
some 1800 grams with a 
width of thorax of 10 cm and 
a thoraxabdomen length of 
45 cm. 
This modification consists of a thumb some two mm wide and 
three long, projecting out so as to exactly meet a slight elevation of 
l mm on the face of the distal segment of the leg, near its base. 
