Bulletin 30 424 



Melongena consors Sby. Glycimeris acuticostata Sby. 



Phos elegans Gpy. Pecten soror Gabb 



Murex domingensis Sby. Cardium hai tense Sby. 



Species in common with Gahin. — The rich collections from 

 the Isthmus in the National Museum have only begun to be 

 studied by Dr. Cooke. When the work is finished a more 

 complete comparison can be made with the Dominican faunas 

 than is now possible. In the present state of our knowledge of 

 the Isthmian faunas it appears to me that comparatively few- 

 species are actually identical but many are analogous. These 

 analogies have in many cases been mentioned in the systematic 

 discussion of our faunas in Bulletin 29 and doubtless Dr. 

 Cooke's work will bring many more to light. Among the 

 species common to the Isthmus and our faunas may be men- 

 tioned: 



List of Species 



Terebra gatunensisToula. Phos metuloides Dall. 



Terebra Wolfgangi Toula. Murex messorius Sby. 



Contis haytensis Sb}\ Sconsia laevigata Sby. 



Conus molis B. and P. Malea camura ? Gpy. 

 Conus syrnmetricus domingensis Sb} r . Petaloconchus domingensis Sb)'. 



Conus consobrinus Sby. Natica canrena (Dinne) Morch. 



Conus tortuosostriatus Toula. Polinices subclausa Sby.. 



Conus gaza J. and P. Sinum gatunense Toula. 



Conus Dalli Toula. Glycimeris acuticostata Sby. 



Tunis albida Perry. Pecten scissuratus Dall. 



Drillia consors Sby. Cardium dominicanum Dall. 



Oliva cylindrica Sby. Cardium serratum Linne. 



Marginella coniformis Sby. Pitaria circinata Born. 

 Mitra longa Gabb. Corbula vimineaGpy. 



Of this list 9 occur in our Bluff 1, 8 in Bluff 3, 6 in Bluff 2, 

 Cercado. This strongly suggests that more than one faunal zone 

 is represented at Gatun because of the faunal break between our 

 Bluff 1 fauna and that of Bluffs 2 and 3. It will be interesting 

 to see whether Dr. Cook does not find more than one zone at 

 Gatun. 



