W. A. Harding 
159 
Glossiphonia sexoculata, Moquin-Tandon, 1846, p. 353, pi. xii, figs. 1—-6 (coloured), 
7—21 (anatomy); Thompson, 1846, p. 390 (recorded from Lough Neagh, Ire¬ 
land) ; Johnston, 1865, p. 51; Dutilleul, 1887 a, p. 128 (dorsal organ, etc.); R. 
Blanchard, 1892 c, p. 178, figs. 1, 2 ; R. Blanchard, 1893 b, p. 3 ; R. Blanchard, 
1893 d, p. 92 (in Norway); Bolsius, 1894 b, p. 292 et seq. ; Bolsius, 1895, p. 159, 
pi. ix (Gregarines in intestine); Bayer, 1898, p. 648 et seq. (sense organs). 
Glossiphonia cimiformis, Baird, 1869, p. 317. 
Clepsine elegans, Verrill, 1872, p. 684. 
Clepsine pallida , Verrill, 1872, p. 684. 
Clepsine patelli/ormis, Nicholson, 1873, p. 494. 
Clepsine sexoculata , Apathy, 1888 a, p. 154, etc., pi. viii, fig. 2 (head); ApAthy, 1888 b, 
p. 791, etc. ; Burger, 1902, p. 525 et seq., pis. xxx—xxxii (development). 
Glossosiphonia complanata, Blanchard, 1894 b, p. 27, figs. 2, 3 ; Johansson, 1909, p. 74, 
figs. 125, 126. 
Glossiphonia complanata , Scharff, 1898, p. 192. 
Glossiphonia elegans , Castle, 1900 a, p. 46, pi. vii, pi. ii, fig. 5, pi. iii, fig. 11. 
Diagnosis. Body ovate-elliptical, of a firm and cartilaginous con¬ 
sistency, with a somewhat rough surface, more or less transparent, 
greenish or brownish, very variable in colour and markings. 
Dorsal surface with two longitudinal, dark brown, interrupted lines, 
arising in somite V, in an outer paramedian position and, typically, 
with six longitudinal rows of yellowish spots, which occur on the first 
ring of each somite and correspond to the inner paramedian, inter¬ 
mediate and outer paramarginal sense organs and papillae. These 
spots may be rounded and compact aggregations of pigment cells or 
more or less spread out into irregular confluent blotches; the inter¬ 
mediate and, less frequently, the paramarginal series may be absent. 
The series of spots corresponding to the inner paramedian (and largest) 
papillae are the most constant and occasion the interruptions in the 
dark brown lines. 
Two interrupted brown lines occur on the ventral surface. These 
are wider apart and less conspicuous than the dorsal pair and rarely 
traverse the entire length of the body. 
68 rings. Somites I—III and XXVI—XXVII uniannulate, IV, 
XXIV and XXV biannulate, the nineteen somites V—XXIII complete 
with three rings. 
The six eyes are disposed in two close parallel rows (on the inner 
paramedian lines). The first and smallest pair, which occasionally 
is absent, occurs in somite II but may be shifted somewhat further 
back and appear between somites II and III or in the anterior part 
of somite III. The second and larger pair lies in the posterior part 
