1. Bulman, O. M. B.: A monograph of the Caradoc (Balclatchie) graptolites in Laggan Burn, Ayrshire.—Palaeontogr. Soc. [Monogr.] 1944–47.
2. Bulman, O. M. B.: Graptolithina with sections on Enteropneusta and Pterobranchia.—Treatise on Invert, Paleont. Pt. V, 1–101. Kansas 1955.
3. —: Lower Palaeozoic plankton.—Quart. J. Geol. Soc. London120, 455–76, 1964.
4. Bulman, O. M. B. & Rickards, R. B.: Some new Diplograptids from the Llandovery of Britain and Scandinavia (in press).
5. Carlisle, D. B.: Protochordata together with Pogonophora, Enteropneusta, Graptolithina, Pterobranchia and Phoronidea.—Zoological Soc. london 1965.