MARINE AVOCD-BORING ANIMALS. 



399 



of the wiflfcli. The distal edges of the segments are acutely 

 V-shaped (this may be partly but not altogether due to their 

 being worn away), and no trace of serration can be seen in any of 



Text-figure 4. 



Xylotrya saulii (Wright). Syntype from Callao. 

 A. Riglit, B. Lelt valve of shell. 



Text- figure 5. 



XyJotrya saxdii (Wright). Syntype from Callao. Pallet. 



Text -figure 6. 



Xylotrya atistralis, sp. ii. Syntype from Auckland. 

 A. Right, B. Left valve of shell. 



the specimens. The stalk is smooth. The soft parts are un- 

 known. The valves measure up to 7*3 mm. in length and a little 

 less in depth. 



