THE NAUTILUS, 1SS9. 



PLATE L 



n 



12. 



1, 2, 3, P. cultratus. 

 4, A. excentricus. 

 6, 7, P. calamitotia. 

 8, 5. arnvmclL 



9, P. c'X'Cif. 15, 5. piiiffuls. 



10, i>, compressicollis. 18, 5. proeiongus. 



11, ]6, B. pinguis var. 14, i>. geoffreyi 



12, " " ?;. dilitatus. 17, P. radiata. 



18, P. alboreflexus. 19, P. c.antori, v. odonns. 



