i88 
ZOOLOGY OF THE FAR EAST. 
distance in front of the middle third of body. The accessory vesicles are each a 
moderately wide tubular body, the wall of which consists of an actively secretory, 
columnar epithelium, invested on the outside by fairly well-developed muscular 
layers. The vesicle contains a quantity of granular secretion apparently derived 
from the epithelial cells. Anteriorly the egg-canal makes an abrupt downward and 
backward bend and is continued as a long and posteriorly directed vaginal passage 
(v), supplying with numerous shell glands and running close along the ventral epi- 
dermis. At a point near the blind end of the prostate, the vaginal passage takes an 
obliquely upward and backward course, running for some distance close to the dorsal 
epidermis. It then describes an arch, and finally, without forming a vagina bulbosa, 
opens to the exterior by the female aperture ( 9 ) nearly in the middle of the space 
between the male aperture and the posterior body-end. In one of the specimens the 
genital openings were found displaced to a remarkable extent towards the left side of 
the body. 
Remark. — This remarkable and interesting species seems to be somewhat related 
to Woodworthia insignis Laidlaw ' and W. atlantica Bock,* but may be distinguished 
from either chiefly by the absence of tentacles and by the exceedingly prolonged 
prostate. Decidedly closer seems to be its relation to the freshwater Polyclad, 
Shelf ordia borneensis, Stummer-Traunfels, with which it agrees in all essential points 
of internal and external characters, except in the absence of a true seminal vesicle and 
of a penial stylet. In my opinion the difference may well be regarded as being of not 
more than specific value. The generic diagnosis of Shelf ordia, hitherto known by the 
single species referred to, should then be slightly modified to run somewhat as 
follows : — 
Stylochidai with elongate-oval body, without tentacles. Marginal eyes in a 
crowded row or rows running all round the body. Mouth nearly in the centre of the 
nuich-folded pharyngeal chamber. Prostate exceedingly prolonged, opening into 
ejaculatory duct by a distinct duct. With or without true seminal vesicle. Penis 
armed or not armed. Vagina of great length, having a bilaterally symmetrical ac- 
cessory vesicle. 
Shelfordia amara, n. sp. 
Text-fig. 2. 
Only a single representative of this second new species of the genus was captured, 
in a ditch at Singgora. 
As in the preceding species the body in the preserved condition is elongate-oval, 
moderately firm in texture, and of a dark olive-brownish colour, lighter on the ventral 
side. It measures ii mm. long by 3 mm. across in the broadest part. Tentacles are 
altogether wanting. 
Eye-spots (text-fig. 2). — Tentacular and cerebral eye-spots blend together, but 
the former are somewhat larger than the latter, both being arranged in an irregular 
1 Laidlaw, F. F., 1904. " On the Polyclad Turbellaria collected by Professor Herdman, at Ceylon in 1902." Report 
Ceylon Pearl Fisheries of the Gulf of Manaar by W. A. Herdman. Part II, pp. 128-130. 
2 Bock, Sixteen, 1913. " Studien uber Polycladen." Zoologiska Bidrag fdru Uppsala. Bd. 2, pp. 142-147. 
