318 GEOFFREY SMITH. 
University Museum. ‘The investigation of this spermatheca 
in the female of Polycheles has revealed a structure identical 
with that of Anaspides. The spermatheca of Polycheles is 
a shield-shaped chitinous structure with a median opening 
leading into a tube which bifurcates exactly asin Anas pides. 
TEXT-FIG. 27. 
Paranaspides lacustris, ?. Ventral view of the last three 
thoracic appendages and first abdominal of left side in situ. 
Th. 6. Sixth thoracic limb. Th. 7. Seventh. Th. 8. Highth. 
Abd.1. Firstabdominal. Spermth. Spermatheca. 2. Female 
opening. 
There can be no doubt that the structure in both cases is 
strictly homologous, and that we have in the spermatheca of 
Anaspidacea a Decapodan character, parallel to the presence 
of the otocyst on the first antenne. 
The thoracic limbs of the fossil Synecarida may now be 
dealt with as far as they are known, and those of Preanas- 
