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1947 T. Gislén in Zoologiska Bidrag från Uppsala 25 405 A being which had fixed itself with the front end on the bottom or which crept on the front end had..already advanced far in the reduction of its right foremost coelom, or, to put it as Heider did, its right protocoele. The other two pairs of coeloms, the hydrocoeles (collar coeloms) and somatocoeles or, more neutrally, the meso- and metacoeles, may have been relatively unaffected.

1967 C. P. Hickman Biol. Invertebr. xxix. 611/2 The coelom of hemichordates is divided into three segments: the proboscis, or protocoel, with a single cavity; the collar, or mesocoel, with two cavities; and the trunk, or metacoel, with two cavities.

1988 Zool. Jrnl. Linn. Soc. 94 259 The lack of mesocoelomic pores and the existence of a stone canal connecting proto- and mesocoel are characteristic peculiarities of echinoderms.