THE NAUTILUS. II 



Cervinetta^ apparently, belongs exclusively to Panama Province. 



The writer has a theory. It is that cervinetta is the closest sur- 

 vivor of the original type, that before the Isthmus was formed the 

 habitat of cervinetta was both East and West. After the Isthmus 

 became a barrier between the oceans the Gulf Stream currents were 

 turned up the East Coast. These currents carried cervinetta north- 

 ward where it found no volcanic disturbance, better food and en- 

 vironment, and cervus and exanthema were evolved from cervinetta. 



But I wish somebody would say why all Cypraea, in Florida, are 

 called ' micramocks." 



UROCOPTIS (ARANGIA) SOWERBYANA (PFR.) A NOTE ON ITS RADULA. 



BY CHAS. T. RAMSDEN. 



Being very much interested in procuring specimens of this shell, 

 I took a trip to its habitat, with Drs. Carlos de la Torre, of the Uni- 

 versity of Havana, and Thomas Barbour, of the Museum of Com- 

 parative Zoology at Cambridge, Mass. 



Unfortunately, althongh we had a hard ride up " Monte Libano," 

 we did not reach the right locality ; I, however, promised Dr. de la 

 Torre that I would try again, further up the mountain, as we were 

 both most anxious to procure living specimens to study the radula, 

 which was unknown to Pilsbry. 



On March 13, 1913, I again went up the mountain for some 

 twenty miles on horseback, over an infernal road, and upon turning 

 over the first stone, I found, to my great delight, my first living 

 specimen of Arangia sowerbyana (Ptr.). I at once concluded that 

 it would be an easy matter to fill my pockets and the small box I 

 had with me, with specimens, and felt sorry I had not brought along 

 more boxes, to take a good supply. A five hours diligent search, 

 however, in crevices, under and on rocks, brought to light some half 

 dozen specimens. I was however satisfied, as we would now be able 

 to know its radula. 



Having sent a part of the catch to Dr. de la Torre for examina- 

 tion, he reports the following : The radula is like that of the Jamaican 

 Spirocoptis, measuring ten millimeters in length, by one and one-half 



