42 
GtEnm—Pharyngora, n.g. 
Phanjnfjorn retractilis, n.g., n.sp. (Plate II., fig- 7.) 
This worm, which, I think, must be regarded as the type of a 
new genus, is closely allied to the members of the sub-family 
Upocreadim* in many ways, although it does not fully agree with 
them, and certainly cannot be regarded as belonging to one ot tlie 
known genera in this sub -family. 
This Trematode was found once only in the upper intestine ot 
a Whiting (December), several specimens being obtained. It is 
colourless, transparent, and very contractile when alive ; so con- 
tractile is the neck part that frequently no prepharynx is seen and 
hardly any oesophagus, when really these organs are quite long. 
The body is covered with spines, and is long and narrow; length 
4-6 mm. when at rest, but it can extend to a much greater length. 
Greatest breadth about 0-50 mm. It is much the same breadth 
throughout, except at the neck part where it gradually tapers oil, 
and at the posterior end it is slightly rounded. The anterior 
sucker measures 0-20 mm. across ; it is slightly flattened at the 
top, and has strongly muscular side walls giving it the appearance 
of a pharynx, much in the same way as in Distomum bacMare 
(Molin). The prepharynx is long, it may be nearly three times 
as Ion- as the pharynx or hardly apparent at all, according to 
state of contraction (in contracted specimens it appears to be partly 
telescoped into the pharynx-like oral sucker). The pharynx is 
0-12 mm. long, and about half as broad. The oesophagus is long, 
0-4 mm. to 0-8 mm., branching about a quarter of the way down 
the body into two fairly thick intestinal lobes reaching to the 
extreme posterior end. The excretory bladder is extremely small, 
about 0-2 mm. long, only reaching about a third of the way from 
he posterior end to the hind testis. The ventral suckex : occurs 
a little way behind the intestinal fork, and measures 0-12 mm. 
across. The testes are oval and have rather an irregular outline 
they measure 0-56 mm. by 0-30 mm., and he one m front of the 
other, with a small space between, the posterior testis lymg 0* 
mm. from the end of the body. Each gives off a ver; fin va 
deferens, which runs up to join the vesicula semmalis. The la ite 
is divided into two parts, the posterior of which is long ^ and jear- 
shaped and Iks outside the cirrus sac and not surrounded by an> 
gtnd ceUs. It thins out abruptly before Joining the second part 
which is spherical, and is enclosed in a cylindrical cirrus sac. Xbe 
