A Monograph Of The Existing Crinoids

Parts 3, 4, and 5 of Volume 1 include the systematic discussion of species and higher groups of living comatulids and unstalked crinoids. Part 4c is the concluding section of Part 4. It continues Part 4b, and includes the account of the two remaining families of Tropiometrida, the Thalassommetridae and the Charitometridae.

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