ent, as shown in figure 24, (C), PI. IX. This drawing is reduced, 

 from a Natica Jieros, 80 mm in length, to correspond in size to that 

 of the protoconch which is only >^mm. in length. 



NATICA TRISERIATA Say 



PI. IV. Fig. 25. Length 16 mm. 



This creature moves rapidly and has the power of crawling on 

 the under surface of the water. The tentacles are wide apart, flattened 

 transversely, broad at their bases, long and pointed, bordered with 

 black on each side with a light interspace in the middle. (Fig. 25 A) 

 tentacles enlarged. 



NATICA CLAUSA Brod and Sow 

 PI. IV. Fig. 26. Length 15 mm. 



The animal differs in no important respect from the other species 

 of Natica. The propodium assumes in form an irregular rhomboidal 

 shield in front. The foot does not reach quite so far back as in Natica 

 triseriata. A sketch of a young Natica hews resembles that of Natica 

 clausa except that the tentacles do not appear so wide apart. The 

 color of the entire animal is a delicate purplish tint. 



NATICA IMMACULATA Totten 

 PI. IV. Fig. 27. Length 8 mm. 



The animal is white; elements of the foot expanded as in other 

 Naticas. The only observation that I made was that the syphonal 

 fold was large. 



NATICA DUPLICATA Say 



PI. IV. Fig. 28. Length 50 mm. 



The extraordinary character of the foot with its three divisions 

 of propodium, mesopodium and metapodium fully developed and 

 these lobes absorbing sea water like a sponge renders it extremely 

 difficult to secure a normal outline of the parts. I have many sketches 



15 



