162 Dr. O'Bryen Bellingham on Irish Entozoa. Serpula proboscidea, Gm. Founded on two figures of Martini which I do not venture to explain. protensa, Gm. echinata, Gm. contortuplicata, L. decussata, Gm. Founded on Lister, t. 547. f. 4. (copied in Martini, 2. f. 17.) from Barbadoes, and is probably a Vermetus : I suspect that Dr. Grube has conceived under this name Vermetus subcancellatus, Born. Spirorbis nautiloides, Lam. EXPLANATION OF PLATE III. Fig. A. The operculum of Serpula vermicular is, L. Fig. B. — aspera, Ph. pig, c. subquadrangula, Ph. Fig. D. The operculum of Placostegus crystallinus, Sc. Fig. E. * fimbriatus, D. Ch. Fig. F. The operculum of Vermilia triquetra, Lam. Fig, Q t infundibulum,, Gm. pig, n # clavigera, Ph. Fig. J. calyptrata, Ph. jp^ t K. multicristata, Ph. jF^ t L. elongata, Ph. i^'tf. M. quinquelineata, Ph. jPjjU. N. polytrema, Ph. jF^. o. emarginata, Ph. Z'fy. P. The operculum of Pomatoceros tricuspid, Ph. jp^ # q # Eupomatus uncinatus, Ph. ^rt R # pectinatus, Ph. jRjy. S. The operculum of Spirorbis Cornu Arietis, Ph. Fig. T. The operculum of Vermilia triquetra, BJainv., according to the ' Diet, d. Sci. Nat/ planches. From the description, it would be the oper-culum of Serpula vermicularis. XIX. — Catalogue of Irish Entozoa, with observations. By O'Bryen Bellingham, M.D., Fellow of and Professor of Botany to the Royal College of Surgeons in Ireland, Member of the Royal Zoological, Geological and Natural History So-cieties of Dublin, &c. [Continued from vol. xiii. p. 430.] Genus 13. Pentastoma. (Derived from 7reVre, quinque, and aropa, os.) Gen. Char. — Body flattened or slightly cylindrical. Mouth situated between two pores upon each side, each pore having a hook-like process projecting from it. The five orifices placed in a lunate manner upon the head. The genus Pentastoma is named so from the presence of five pores upon the head, the central one being regarded as the mouth. Rudolphi separated it from the genus Polystoma with
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