52 
compressis prominentibus ; anfractuum parte inferiore plana ; 
umbilico patulo , crenulato. 
Hab. in insulis Philippinis. 
Shell orbicular, discoid; spire depressed, white, whorls sharply 
angulated, periphery with a single series of prominent broad trian¬ 
gular compressed spines radiatelv disposed ; lower part of whorls 
smooth ; umbilicus wide, crenulated. 
Hab. Catanuan, province of Tayabas, island of Luzon, sandy mud, 
10 fathoms; H. C. (Mus. Cuming.) 
A small species, partaking somewhat of the characters of D. stella- 
ris, Adams and Reeve, but much more depressed, and the lower part 
of the whorls simple. 
March 26, 1850. 
W. Yarrell, Esq., V.P., in the Chair. 
The following papers were read:— 
1. On a Leech new to the British Fauna. 
By J. E. Gray, Esq., F.R.S. 
Mr. Hoffmann lately sent to the Zoological Gardens a living spe¬ 
cimen of a very large leech which he had found near his house in 
the Regent’s Park. It has been preserved in fluid, and now forms 
part of the Collection of British Animals in the British Museum. 
It proved to be an adult specimen of Trochetia subviridis, Dutro- 
chet (. Lamk. Hist. A. s. V. v. 523), well-figured in the 2nd edition 
of Moquin-Tandon’s ‘Monograph of Hirudines,’ t. 4. It is a very 
interesting addition to the fauna. It is the giant of the family, this 
specimen being more than 7 inches long. 
* 
2. On the Occurrence of Regalecus glesne at Redcar, 
Yorkshire, in 1850. By J. E. Gray, Esq., F.R.S. 
A specimen of this fish was cast ashore on Redcar Sands, York¬ 
shire, on Thursday, the 3rd of January 1850. “The fish was alive 
when found. Length without the tail-fin, which is wanting, about 11 
feet; width at the broadest part, 12 inches ; weight, 4 stone 10 lbs.” 
It was salted and exhibited at Redcar. During the exhibition the 
rays of the dorsal and ventral fins were almost entirely destroyed, and 
it broke transversely into three nearly equal lengths on being moved 
from the sand. 
It was eventually sent to London, and now forms part of the Col¬ 
lection of British Animals in the British Museum. The specimen, 
when it arrived in London, agreed in general appearance and in all 
essential characters with the specimen from Cullercoats which was 
exhibited in London last year. Mr. Wrightson, who had the care of 
it at Redcar, considered, because it had no expanded forked tail, 
that the tail was wanting. 
