Bone, Q., 1958, The central nervous system in larval acraniates: Quarterly Journal of Microscopical Science, v. 100, p. 509-527.
Wickstead, J. H., 1975, Chordata: Acrania (Cephalochordata), in Giese, A. C., and Pearse, J. S., eds., Reproduction of Marine Invertebrates II, Entoprocts and Lesser Coelomates: New York, Academic Press, p. 283-319.
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