TUB NAUTILUS. 123 



might take a thousand each of four species in a single tide. These 

 seem to flourish under conditions that have driven other species 

 away. I am unable to recognize many of Adams' species. 



Many Marginellas dead in the sandy mud, few alive. Adams saw 

 only fragments of Strombus galea, easily found now, botli young and 

 old. All the Strombi attributed to this province are found in good 

 condilion but, like other species, washed ashore. They are more 

 plentiful than when Adams was there, but found at Taboga only. 

 Ranellu caeluta, Adams took 190 specimens, alive, at half tide. 

 None alive from high to low tide now. Crabs bring them up in 

 great numbers and good condition. 



Adams found Murex, 9 species. Found them alive, from half 

 tide to low. Not now. Hermit crabs and diving black boys are the 

 collectors now. Many beautiful and absolutely perfect specimens, 

 too, are washed up dead, to half tide. I found six varieties. 



Adams names only one species of Fusus (bellus). I took four 

 species at Taboga, two species alive at half tide. Hermits could 

 have furnished a peck. CanceUaria about the same but not alive. 

 Pleurotoma abundant, but in no such numbers as indicated by 

 Adams. Few alive. Cerithium. Adams found 14 species, 3400 

 specimens ! ! Half a dozen species now brought up by hermit crabs. 



Turritella banksi. Adams took 350 specimens, one-third of them 

 alive. They have gone to deeper water but crabs bring up fine 

 specimens. Adams found 90 specimens of Pedipes angulata under 

 Panama sea wall, and 650 Auricula panamensis in same station. 

 Not a specimen of anything to be found there now except Purpura 

 in small numbers and Nerita out of water. Adams indicated 

 scarcity of Pec ten and Pectuncultis. Now most plentiful decoration 

 of the beaches. Adams found Cypraea cervinelta, arabicula, punctu- 

 latis and pustulata on the Panama reefs. Not one of these there 

 now. There is no coral. To be found in small numbers at Taboga 

 where there are small patches of coral to furnish food. 



Recapitulating : for four miles either side of the Canal mouth in 

 the Bay all but the coarser, sturdier forms have disappeared. Chi- 

 tons, Purpura, Siphonaria and Fissurella are there, but few others, 

 and all in small numbers. There is no food on the reefs. Every- 

 where, in the region covered by Adams, the stations and habits have 

 materially changed. It might be interesting to compare individual 

 specimens of to-day with those of same species taken by Adams 



