GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 203 



with a synapticulate and perforata wall at and just below the calicu- 

 lar margin, the wall at lower levels usually, but not invariably, 

 becoming solid. In Fabiani's list this species, under the generic 

 name StepJianosmilia (name proposed by Reuss in 1874, not Sie- 

 phanosmilia De Fromentel, 1862), comes between Parasmilia and 

 Plocophyllia (a synonym of Euphyllia). I do not know what the 

 systematic relations of Leptaxis Reuss are. Reuss based the genus 

 and the type-species, L. elliptica Reuss, on a single specimen from 

 Monte Grumi and seems not to have obtained another from any- 

 where. Until additional specimens of L. elliptica have been critically 

 studied, Leptaxis is not an identifiable genus. Although Duncan 

 considered Leptaxis a subgenus of Antillia, I think that it may be 

 one of the simple fungid genera. The species referred to 10 genera, 

 whose names are followed by a question mark," ?," should all be 

 critically restudied. 



The names of the genera preceded by an asterisk, "*", in the 

 foregoing table are also found in the middle Oligocene of the West 

 Indies or the southeastern United States. The following genera 

 have closely related species: 



Stylophora Euphyllia Leptomussa Actinacis 



Stylocoenia Orbicella Cyathomorpha Goniopora 



Astrocoenia Antiguastrea Astreopora Alveopora 



I am not at all sure that some of the American middle Oligocene 

 and the European Rupelian species are not identical. 



Dr. Joseph A. Cushman has described the following species of 

 Lepidocyclina from the collection I made in Antigua (not yet pub- 

 lished) : 



Lepidocyclina gigas Cushman 



undulata Cushman 

 undosa Cushman 

 favosa Cushman 



L. undulata seems to be the largest known species of Lepicocyclina , 

 some specimens attaining a diameter of 100 mm. 



The calcareous algae, echinoids, Mollusca, and Bryozoa, as well as 

 the Foraminifera of the Antigua formation will be described in a forth- 

 coming volume to be published by the Carnegie Institution of Wash- 

 ington. The Antigua formation must, in my opinion, be the type 

 of the American middle Oligocene. 



PEPINO FORMATION OF PORTO RICO. 1 



The corals here listed were almost all collected by Mr. R. T. Hill. 

 I have added the names of a few additional species collected by 

 members of the New York Academy Porto Rico Survey. 



1 For accounts of the geologic relations of this formation, see Hill, R. T., Notes on the forest conditions 

 of Porto Rico, U. S. Dept. Agriculture Div. of Forestry Bull. No. 25, pp. 14, 15, 1889. Vaughan, T. W. , 

 see references in footnote on pp. 193,205. 



