O'COXNELL, REVISION OF THE GENUS ZAPHRENTIS 181 



Considering Edwards and Haime's synonymy species by species, we 

 find that the description of Lesneur's CartjophyUia cornicula agrees with 

 that of Zaphrentis cornicula E. and H. so far as it goes, but it contains 

 no reference to a fossula which in Z. cornicula is "deep, situated near the 

 convex curvature and prolonged upward to form a very marked groove." 

 (9, 327.) In giving the localities where C. cornicula is found, Lesueur 

 says that 



many rolled forms [/. e., water-worn forms] are found along the borders of 

 Lake Erie, near Eighteen-Mile Creek. The most perfect individuals are en- 

 closed in the most compact banks which also contain the terebratulas [brachi- 

 opods]. 



He adds: 



With this species I have found a great quantity of little spherical globules^ 

 with spiral striae, as in the Gyrogonites of Europe^" [a genus of fossil Cha- 

 racese]. That, however, could be another species." 



He also had specimens from Kentucky which were undoubtedly what 

 are now commonly known as Zaphrentis (Heliophyllum) cornicUlum and 

 were the same as the Zaphrentis of Eafinesque and Clifford, also from 

 Kentucky. As for the Eighteen-Mile Creek forms, the only rugose corals 

 which answer to his description are Streptelasma (Stereolasma) rectum, 

 so far as the form is concerned, and Heliophyllum halli, the only carl- 

 nated species which occurs in great abundance there. 



It is quite probable that the Eighteen-Mile Creek forms referred to 

 this species are all Stereolasma rectum, which in form closely resembles 

 Z. corniculum. The Eighteen-Mile Creek specimens almost never show 



de la grande courbure et se pi'olongeant en haut sous forme d'une rainure bien marquee. 

 Appareil cloisonnaire assez reguliferement radie. On compte ordinairement de 72 a 92 

 cloisons alternativement un peu inegales, qui sont trfes-serrees, minces, fort etroites en 

 haut, non debordantes. Leur bord est divise en points saillants, serrees, k peu pr&s hori- 

 zontales et plus grandes sur le milieu de la partie libre. Les principales cloisons arrl- 

 vent jusqu-au centre de la fossette calicinale, ou elles sont legferement courbees et un peu 

 relev^es, Dans certains individus dont le plancher superieur est enlev6, et dont peut- 

 6tre les cloisons ont ete partiellement detruites, on voit une petite partie lisse sur le 

 milieu des planchers. Les grands exemplaires ont 8 centimetres de hauteur, le calice est 

 large de 5 et profond de 3. On trouve frequemment des jeunes qui no sont hauts que 

 de 3 centimetres et larges de 2." (9, 327, 328.) 



^" This is, however, a mistake so far as the Lake Erie shore near Eighteen-Mile Creek 

 is concerned. No such bodies occur there, but they abound with Z. cornicula in the 

 Columbus limestone of Ohio. It is quite evident that specimens from both localities 

 were commingled. 



w- "On en rencontre beaucoup de roules sur le bord du lac Eri^, pr&s de dix-huit mille 

 crick, Les individus plus parfaits sont renfermes, dans les bancs les plus compacts, qui 

 font partie de ceux a terebratules. 



"Avec cette espfece j'ai rencontr6 une assez grande quantity de petits globules sph€- 

 riques, avec des stries en spirale, comme dans la gyrogonite d'Europe. Celle-ci en seroit 

 une autre espfece." (2, 298.) 



