166 ON A CRUSTACEAN OF THE ORDER ASCOTHORACICA. 



EXPLANATION OP THE PLATES. 

 Plate 33. 



Pig. 1. Entire animal of Synagoga mira with its shell, female. 



2. „ ,, ,, „ with shell removed, showing the bases of the large muscles 

 which attach the animal to the shell. 



3. The antennule. 



4. Portion of margin of shell showing structure and ova within. 



5. Portion of ovaries in tubule removed from the shell. 



6. Uropods from below showing telsonic spines at the base, but their upper portion and attachment 



hidden by the uropods. 



Plate 34. 



Fig. 1. Mouth-organs in the form of a cone as seen naturally in the enclosing sheath. 



2. The same under pressure to exhibit the various portions of the mouth-organs. 



3. The uppermost pair of these organs. 



4. Second pair. 



5. The third pair. 



6. Portion of the teeth of the third pair to show they are divided. 



7. The central organ. Whereas the other members of the mouth are in pairs, there is only one 



central organ. 



8. 9, 10. Three different illustrations of the peculiar organ situated behind the antennae, showing 



the papilla which is supposed to represent the orifice of the oviduct. 



Plate 35. 



Fig. 1. Foot of first pair 



2. Foot of second pair. 



3. Foot of sixth pair. 



4. Penis seen from the side as attached to a first segment of the metasome. 



5. The same as seen from below, partly diagrammatic. 



6. The last segment of the mesosome and the first of the metasome; this last supposed to represent 



the generative segment of the female. 



7. Spines attached to telsou. 



