322 SIGNOR F. S. MONTICELLI ON [June 4, 
for this Distomum, which up to now has been found in the stomach 
only. 
D. microcephulum, Baird (Cat. Ent. Brit. Mus. p. 98, pl. ii. fig. 2), 
from the stomach of Acanthias vulgaris, is, I think, based on small 
specimens of D. veliporum. 
3. DistomMuM 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 
and 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 specimeus of this new species were taken by Dr. Giinther 
from a Playyodus ferox trom Madeira. Trematoda have not been 
previously observed in the Plagyodontina. 
4. Disromum cicas, 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 dusonia cuviert which was found on 
the British coast. 
5. Distomum Hatosaurt, 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 Halosaurus macrochir dredged off Cape St. Vincent. 
I 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 pre- 
paration, 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 ; cesophagus 
slender ; intestinal czeca 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 Halosaurus. 
6. DipyMozoon SERRANI, sp. n. (Plate XXXIII. fig. 6.) 
This new species was found on the gills of a Serranus fimbriatus 
from Madeira; the same undescribed species I have frequently found 
attached to the gills of the Serranus gigas of the Gulf of Naples. 
