of the Fishery Board for Scotland. 89 
minute head, and the readiness with which the lower “‘ joints ” (proglottis), 
separated from each other. The longest example I obtained measured 
fully niue feet, and appeared to be fairly complete. Another specimen 
reached to about seven feet in length, and there were a number of smaller 
pieces. 
The proglottides or “joints” near the middle and towards the posterior 
end of the larger specimens measured from ten to twelve millimeters in 
width and nearly the same in length. The head or scolex seen in profile 
is very compressed, but viewed in front its outline is somewhat triangular, 
and the suckers—two in number—occupy the two sides of the triangle, as 
shown in the drawing (fig. 6, Plate V.}. The neck is extremely slender, 
measuring only about ‘08 mm. in width. 
There appears to be very little known concerning the life-history of this 
Cestode, but probably in its larval stage it lives encysted in the body of 
some species of fish such as the whiting, considerable numbers of which 
are sometimes captured by this Cetacean for food ; the Cestode being in 
this way introduced into the stomach of the Porpoise would obtain its 
freedom and be able ere long to attain to sexual maturity in the intestine 
of its new host. 
Figure 1, Plate VII., is from a photograph, about natural size, of the 
largest of the specimens of the Diphyllobothrium, from the Porpoise 
referred to. The Cetacean was obtained in May 1900. 
(2) On NEMATODES OR THREADWORMS OBSERVED IN THE STOMACH AND 
OTHER VISCERA OF A ComMMON PORPOISE. 
In another Porpoise obtained on June 18th, 1902, under much the same 
conditions as the one mentioned above, no Cestodes of any kind were 
observed, but in the stomach and some of the other internal organs many 
small threadworms were noticed. The length of some of these measured 
between forty-five and fifty millimeters, but the majority were considerably 
smaller. The worms occurred in abundance in the stomach and other 
portions of the viscera, and were of a dull reddish-brown colour. 
Strongyloid Nematodes, known as Lung-worms, are found parasitic in 
the Common Porpoise ; they are all viviparus. Three species have been 
recorded, Prosthecosacter inflecus, Diesing, measuring 6 to 9 inches in 
length ; ’P. minor, Diesing, the length of which is about an inch ; and 
ae convolutus, Diesing, the length of which may extend to a little over 
one and a half inches (18—20"). 
Dr. Cobbold, referring to these worms, states that when “ they are 
examined in a fresh state the young may occasionally be seen escaping 
from the waring, °° 5"): that Professor van Beneden noticed this 
phenomenon in Prosthecosacter inflezus, and the same was observed by 
Busk in P. convolutus.” * 
The Entozoa from the Porpoise examined at the Laboratory in 1992, 
like those mentioned above, are apparently also viviparous, and they agree 
fairly well with the species last named—P. convolutus, Diesing. 
Though the specimens when removed from the Porpoise were still alive, 
they had to be put into preservative fluid straight away, and therefore I 
had not the good fortune to observe the phenomenon referred to by 
Cobbold. Afterwards, however, when a few of them were dissected, fully 
formed larve were obtained in considerable numbers. 
Figure 13, Plate V., represents the posterior portion of a female 
specimen showi ng the larve zn situ. Figures 13 a., b., and c. represent three 
* Entozoa of Man and Animals, p, 423. 
