Publisher's Synopsis
Excerpt from Boletin del Instituto Geologico de Mexico, Vol. 8
La ornamentacion esta limitada ala parte externa delos ancos y al dorso de la concha, mientras que el resto de la concha parece ser completamente liso. En el margen e'xterno de los ancos se observan tuberculos marginales muy juntos, bien pronunciados, prominentes y por lo general ligeramente semilunares. La parte central de la parte externa, limitada por los tuberculos mencionados, es completa mente lisa o presenta una serie de pequenos tuberculos externos, situados en uno de 'los ejemplares entre el mismo par de tuberculos marginales y en otro al con trario en el intervalo entre dos pares de tuberculos marginales.
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