| The colors are obscure, but the striations on the calyculus are violet-tinted, and the reds perhaps predominate elsewhere. |
| The obconic calyculus is always represented in the outline if not in definite structure. |
| This common species is well marked both by its color and by the delicate attachment of the capillitium to the calyculus. |
| The well-defined calyculus is narrowed below and eroded or denticulate above. |
| It differs from all other American forms, so far described, in the peculiar development of the calyculus. |
| The outer membrane of the calyculus is by no means always absent. |
