Mortensen, T. (1910). On some West Indian Echinoids. Bulletin of the United States National Museum, 74. Smithsonian Institution: Washington D.C.17 pl., 31 pp.
Part of: Bulletin of the United States National Museum. Smithsonian Institution: Washington. ISSN 0362-9236
In my work on the Echinoidea of the Danish Ingolf expedition preliminary diagnoses are given of several new species of echinoids. These diagnoses, though, I think, in general sufficient for the recognition of the species, are, of course, by no means detailed, and I hope in the future to be able to publish full descriptions of all the species which I have thus established. The difficulty is that most of these are not represented in the Copenhagen museum, so that I must depend on what opportunities there may be for me to get material from other institutions. Such an opportunity was accorded me on a visit to the US National Museum in the spring of 1906. I found there a good representation of two of my previously indicated species, namely, Calocidaris micans and Araeosoma belli. I was allowed to examine this material in detail, and as I had no time to do it during my short stay in Washington, I was permitted to borrow the specimens and to have them sent to Copenhagen, where I could study them exhaustively.Together with this material I also received some other specimens of West Indian cidarids. The study of these specimens, together with some collections made by myself during a stay in the Danish West Indies in the winter 1905-6, made it clear to me that still another species of cidarid, besides those previously known, occurs in the West Indian seas, probably hitherto confounded with Cidaris cidaris (Dorocidaris papillata), as has been the case with so many other species. A description of this new form is included here. A full description is also given of the much discussed, but hitherto not thoroughly described, Tretocidaris bartletti, of which species I have likewise had material sent for study. Finally a few remarks are added on the species Cidaris abyssicola and C. rugosa.The revised list of North American Atlantic and West Indian Echinoids may, I hope, prove not without value.
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