40 
Dr. C. H. O’Donocuus, F.Z.8., read a paper “On the Venous 
System of the Dogfish.” The general disposition of the main 
trunks in Scylliwm is similar to that described in other Hlasmo- 
branchs, but the details differ considerably. Owing to a mis- 
interpretation of certain vessels in the embryo, the vein usually 
described as the subclavian in the adult is, in reality, the sub- 
scapular, and the vein bringing back blood from the pectoral fin 
and the abdominal wall, 7. e. the true subclavian, is generally 
omitted altogether. 
The details of the hepatic portal factors which differ con- 
siderably from other Hlasmobranchs are described for the first 
time. In most vertebrates the whole of the blood from the gut 
is collected by the hepatic-portal vein, but in Seylliwm a well- 
marked intestino-mesenteric vein conveys blood from part of the 
intestine to the post-cardinal sinus. 
Although developmentally the anterior cardinal sinus and the 
post-cardinal sinus open into the ductus Cuvieri in the adult, 
owing to the dilation of the two sinuses, the anterior cardinal 
sinus and the ductus Cuvieri open into the post-cardinal sinus. 
The posterior cerebral vein leaves the skull with the vagus 
nerve and enters the front end of the anterior cardinal sinus, a 
point that has been overlooked in other Elasmobranchs. 
Mr. B. F. Cummines read a paper, communicated by the 
Secretary, on the ‘‘Scent-Organs in Trichoptera,” in which he 
gave an account of the remarkable development of the palpi of 
the first maxilla in a male Caddis-fly, Sericostoma personatum. 
Instead of being 5-segmented, the palpus consists of a single 
swollen segment carrying an enormous tuft of long silky hairs, 
at the bases of which unicellular scent-glands are situated. The 
existence of scent-glands was suggested by a previous author in 
describing the courtship of this species. ‘The palpus was studied 
in serial sections, and the modifications in the structure of the 
rest of the head are detailed. Scent-organs are well known to 
occur in Lepidoptera and other insects, but have not previously 
been described from the Trichoptera. 
Mr. H. A. Baytis, B.A., described a new species of Cestode 
collected from an Albatross (Diomedea irrorata) by Dr. H. O. 
Forbes in Peru and presented by the Hon. N. C. Rothschild to 
the British Museum. 
A paper on “ The Deinocephalia, an Order of Mammal-lke 
Reptiles,” was read by Mr. D. M. 8. Warson, M.Sc., F.Z.5., in 
which the skull of a ‘Lapinocephaloid is almost completely de- 
scribed; its most important morphological features are the large 
quadrate and the fact that the temporal fossa is completely sur- 
rounded by the postorbital and squamosal. 
In the post-cranial skeleton the most important features are 
