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EXPLANATION OF PLATE XXTX. 



All Figures are outlined tjy the aid of the Camera Lucida. 



Fig. 1. — Tridonf.ophoriifi infernifidins, n. sp., X 2, showing pro- 

 portions of juiinial, and feniaU* opening. 

 Fig. 2. — Anterior end of same, x 42. 

 B.C. = Buccal capsule. 

 C.P. = Cervical j)Mpill;o. 



