568 GILBERT C. BOURNE. 
elongated, and regards each as being composed of two fused 
joints, making the total number six.'. His figure (op. cit., 
Taf. xii, fig. 15) is hardly in accordance with his description. 
The characters of the antenne, and the arrangement of 
their spines and sete will best be understood by reference 
to fig. 2. 
The antenne of the male, in M. anglica, have each five 
joints, of which the two last are subequal in length, and are 
hinged so that the last joint may be folded back on the fourth. 
The terminal part of the last joint is obscurely marked off as 
a sixth joint and is furnished, besides others, with two dicho- 
tomously branched sete, which are probably smelling hairs 
(fig. 6). A comparison of the antenne of the male and 
female lead to the conclusion that the three proximal joints 
correspond in the two sexes, but that the fourth joint in the 
female is formed of three fused joints of which two are com- 
pletely and one incompletely separated in the male. Thus, as 
Claus pointed out, the number of joints in the antennee is six, 
and in this, as in their general characters, they resemble those 
of the Coryceide. 
Not only are the second antennz absent in all the adult 
specimens examined by me, but also all the gnathites, as has 
been noticed by all previous observers with the exception of 
Semper, who refers to two pairs of small processes lying above 
the mouth, which he thinks may be the rudiments of the 
gnathites (op. cit., p. 106). In one of the immature speci- 
mens, taken by Dr. Norman, I found two such pairs of minute 
processes, and have not the least doubt that they are the 
representatives of the gnathites, probably of the mandibles 
and maxille. They are shown in fig. 11. I was unable to 
find any trace of them in the adults, and conclude that they 
must be lost during subsequent ecdysis. 
1 Since writing the above 1 have observed that the antenne in Scott’s 
specimens from the Firth of Forth have the characters assigned to M. 
helgolandica by Claus. I have no doubt, therefore, that Scott’s specimens, 
which differ in this as in other points from the others in my possession, 
belong to the species discovered by Claus in Heligoland. 
