508 YROFFREY SMITH. 
the lower lobe as corresponding to the spine row of the other 
forms. The palp is three-jointed, with a very short termina 
joint. 
Apart from the abnormal condition of Koonunga, the 
Trxt-FIc. 13. 
1S: 
wf 
Paranaspides lacustris. First maxilla. 
mandible of the Anaspidacea resembles that of the Mysi- 
dacea, except that the lacinia mobilis, characteristic of the 
latter, is absent in the former. 
In the Euphausiacea and Decapoda the mandible consists 
Trxt-FIG. 14, 
oan 
ae: 
14. AN 
Koonunga cursor. First maxilla. 
of biting lobe and molar surface without any spine row or 
lacinia mobilis. The Anaspidacean mandible is therefore 
intermediate in structure between that of the Peracarida and 
Eucarida. 
