The siphuncle in Mensicoceras is large with short septal necks and thin connecting rings.

The central cavity is dorsally concave where a broad dorsal process is formed in which is said to contain a pair of dorso-lateral blades, and flat ventrally.

Mensicoceras from the Chazy and the earlier Najaceras from the Whiterock age are similar in having a longitudual process formed along the inner dorsal side of the siphuncle around which the endocones form, but differ in details such as with the central opening.

The Treatise on Invertebrate Paleontology (1964) shows Meniscoceras in the Proterocameroceratidae, a carry over from before the time its ancestor, Najaceras was discovered.

The type species, Meniscoceras coronense, is known from the Chazyan of New York State.