ON HELMINTHES. - 225 
Suckers are dorsal and ventral, The segments overlap markedly 
as in D, perfoliatum. Hggs measure 0°025 mm. 
ORIANA WILSONI, gen. et sp. n., from Lalenoptera borealis. 
Segments all immature. Strobila 13 ems. Head discoidal, 
3 mm. in diam., quadrate in outline, 4 round suckers present 
terminally. Neck very slender. Testes arranged in two definite 
groups of 7-8 and 17-18. Near to Diplobothrium. 
TETRABOTHRIUS WRIGHTI, sp. n., from Pygoscelis adelie. 
Strobila 2°2 mm., but none contains eggs. Head 0:4 mm. in 
length. Testes constantly twelve, auricular appendages of suckers 
well developed. 
ANTHOBOTHRIUM WYATTI, sp. n., from Trematomus bernacchii. 
Small scolices, unsegmented. Four large auricular appendages 
each occupied by two tandem suckers. A bright pigmented band 
crosses the neck in the living state. 
9 species were collected in Tropical and Temperate Zones during 
the voyage of the ‘Terra-Nova.’ Of these three have been 
recorded previously, viz. :— 
ABOTHROS CARCHARIAS and a larval TrerrarHyncHus from 
Carcharias sp., and TETRABOTHRIUS HETEROCLITUS Dies. from 
Puffinus cinereus. 
Five Cestodes, all of the genus TETRABOTHRIUS, are new, viz. :— 
TErRABOTHRIUS CREANT, sp. n., from Wstrelata trinitatis and 
i. arminjoniana. 
Strobila 4°5 ems. Head 0°84 mm. broad, carries four suckers 
but no rostellum. Testes are numerous. Yolk-gland large. 
Cirrus 0:06 mm. 
TETRABOTHRIUS CATHERINA, sp. n., from Wstrelata trinitatis. 
Stouter than preceding. Head comparatively small. Suckers 
most on top of head. Segments overlap succeeding segments 
by one-third. Testes 30 to 45, bunched in middle of segment. 
Genital organs very characteristic. Cloaca divided into outer 
and inner portions. ‘There is a large pyriform seminal vesicle 
internal to the cirrus. 
TETRABOTHRIUS AICHESONI, sp. n., from Wstrelata trinitatis. 
Strobila 3 cms. Moreslender than preceding. Segments more 
uniform, only overlap slightly. Testes arranged in three distinct 
sets, are very numerous, far in excess of those of the previous 
forms. 
TETRABOTHRIUS PRIFSTLEYI, sp. n., from a Frigate-bird (Fregata 
aquila or F’. ariel). 
Strobila 10 ems., excessively slender with large tulip-like heads. 
Testes 17-20. Near to 7’. pelecanit Fuhrmann. 
Proc. Zoou. Soc.—1914, No. XV. 15 
