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Show 322 SIGNOR F. s. MONTICELLI O N [June 4, for this Distomum, which up to now has been found in the stomach only. D. microcephalum, Baird (Cat. Ent. Brit. Mus. p. 98, pi. ii. fig. 2), from the stomach of Acanthias vulyaris, is, I think, based on small specimens of D. veliporum. 3. DISTOMUM MICROPORUM, sp. n. (Plate XXXIII. fig. 1.) Body elongated, pyriform, of a yellow colour, finely plicated transversely, with a small caudal appendage; in front very narrow aud cylindrical, behind gradually enlarged and swollen; posterior extremity obtusely lanceolate. Anterior sucker large, circular, sub-terminal, situated entirely on the ventral surface ; posterior sucker smaller than the anterior, circular, placed at the commencement of the posterior enlargement of the body. The small genital antrum is placed almost immediately behind the anterior sucker. Penis of moderate size, enlarged at the base. Excretory system opening at the extremity of body subdorsally. Lengths of the specimens 20- 32 millim. The six specimens of this new species were taken by Dr. Gunther from a Plagyodus ferox from Madeira. Trematoda have not been previously observed in the Plagyodontina. 4. DISTOMUM GIGAS, Nardo, Mem. sopra alcune nuove e rare specie di Entozoi, in Heusinger's Zeitsch. f. org. Physik, 1827, p. 68. (Plate XXXIII. figs. 2, 3.) I give a figure of this rare species, which, so far as I know, has not yet been figured. The only specimen existing in the collection was taken from the stomach of an Ausonia cuvieri which was found on the British coast. 5. DISTOMUM HALOSAURI, Jeffrey Bell, Ann. & Mag. Nat. Hist. (5) xix. pp. 116-117. (Plate XXXIII. figs. 4, 5.) Mr. Bell has described this species, found in the enlarged ends of the ureters of a Llalusaurus macrochir dredged off Cape St. Vincent. 1 give a figure of this interesting species, and I add some remarks to Bell's description. Anterior sucker small, globose, situated ventrally, presenting in front a pointed elevation, which, observed in a microscopical preparation, seems to be pierced by a cavity (see fig. 5). Posterior sucker as large or hardly larger than the anterior, circular, enlarged, prominent. Pharynx enclosed in the anterior sucker ; oesophagus slender ; intestinal caeca not very long. Testes in irregular outline ; ovarium before the testes; uterus much extended through the body ; genital antrum placed immediately before the posterior sucker. Entozoa have not been before discovered in Lfalosaurus. 6. DIDVMOZOON SERRANI, sp. D. (Plate XXXIII. fig. 6.) This new species was found on the gills of a Sen-anus fimbriatus from Madeira ; the same undescribed species I have frequently found attached to the gills of the Serranus gigas of the Gulf of Naples. |