364 - DR. T. S. COBBOLD ON SOME NEW FORMS OF ENTOZOA. 
2. Distoma MINUTUM (mihi). Body flat, smooth, oblong, narrowed in front; oral sucker 
oval, subterminal ; ventral sucker orbicular, central. Length 135 1% in.; breadth 
147-135 in. (Figs. 4, 5.) | ( 
Remarks.—This exceedingly small trematode was found in great abundance in the 
duodenum of an Oyster-cateher (Hæmatopus ostrealegus, L.), and could scarcely be dis- 
cerned with the naked eye. . Its form is entirely different from D. brevicolle described by 
Creplin as infesting this bird; moreover the latter is a much larger species. The pre- — 
sence of a long uterine canal crowded with ova showed its mature character, while few 
traces of other organs were to be seen. I did not succeed in detecting with certainty the 
position of the genital pore, but appearances seemed to indicate its presence directly above 
and to the right of the ventral sucker. : 
3. Distoma Boscı (mihi) Body subclavate, covered with minute spines, slightly eom- — 
pressed, thickened below; oral sucker orbicular, subterminal; genital pore above the 
ventral acetabulum. Length 4-4 in.; breadth 73—% in. (Figs. 6, 7.) 
Fasciola colubri, Bosc, Hist. Nat. des Vers, i. p. 271, with figs. : 
Distoma colubri Americani, Rudolphi, Entoz. Hist. vol. ii. p. 434; and Synops. p.121; Diesing, Syst. 
Helminth. vol. i. p. 398. e | : | 
Remarks.—This species has hitherto been only very briefly noticed, and is placed by 
Diesing among doubtful and imperfectly-described forms. Like Bose, I found several — 
specimens in the buccal cavity of an American serpent of the genus Coluber, the specific 
name of which I am unable to give. The worm is provided with a muscular oesophageal — 
bulb, two simple digestive cæca, and largely-developed reproductive organs. 
4. BILHARZIA MAGNA (mihi) Body smooth, linear, gradually narrowed anteriorly ; oral | 
sucker oval, subterminal; ventral acetabulum round, very prominent. . Length — 
upwards of 1 in. (Figs. 8, 9.) ! EG E 
| Remarks.—Up to the time of Bilharz’s discovery of Distoma hematobium, all the flukes — 
were considered hermaphrodite, and I am not aware that any other species excepting the Jå 
above has been since found to present a deviation from the general type. Trematodes 2 
regn: ic marked a structural peculiarity as D. hæmatobium, associated as it is with — 
the presence of a gyncecophoric canal in the male, deserve, I think, to be generically sepa- = 
rated from Distomata properly so called, and I have therefore employed the indefatigable — 
discoverer’s name for this purpose. Only a single male example of the species here recorded 
jin observ ed by me, while engaged in the dissection of a Sooty Monkey (Cer copithecus — 
P uliginosus), in some blood which had escaped from the divided portal veins. It isa mue 
larger species than Bilharzia (Distoma) hæmatobia ; Sut us precise length I am unable — 
to record, as å portion of the caudal extremity had been aceidentally removed. Unfortu- — 
nately it was at the time regarded as a common nematode; but hud its true nature vr 
earlier detected, a more careful examination of the blood-vessels would probably d 
brought other individuals to light. | 
