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XVIII. On a new Genus of Teredinine. By E. PERCEYAL Wrieut, M.D., FR. 0.S.I., 
: | F.L.8., Lecturer on Zoology, Dublin University. 
(Plate XLVI.) 
Read January 21st, 1864. 
IN the year 1858 I had the pleasure of examining a very interesting collection of both 
vertebrate and invertebrate animals made by my friend A. A. Dunlop, Esq., in the 
Bengal Presidency. The collection chiefly consisted of insects and birds; but there were 
many specimens also of reptiles, and a few of Planaria and mollusks. Among the 
Planaria I may mention a species of Bipaliwn*, a genus established by Stimpson the 
preceding year, in ignorance of which I described it in 1860 under the name of Dun- 
lopeat. A large species of a Teredine likewise attracted my attention, and Mr. Dunlop 
kindly presented me with the only two specimens he possessed. After a close examination 
I came to the conclusion that the species was then undescribed, and belonged probably 
to the section of the family Teredinine with compound siphonal pallets. The pecu- 
liarities, however, presented by this species are such as to preclude my referring it to the 
genus Xylotrya of Leach. I have therefore been obliged to make a new genus for it, 
which I rather regret, as I have been unable to examine fresh specimens of the animal, 
and the spirit specimens were too much injured for me to pay any very particular atten- 
tion to their anatomy. 
The most interesting fact, however, in connexion with this Teredine is its habitat, the 
following particulars of which will, I believe, abundantly prove it to be a freshwater 
species of Shipworm. 
The district in which it was found is the indigo country below Fureedpore, which is 
watered by the Comer. The river Comer is a branch of the Hurreegonga, which is itself 
a branch of that portion of the Ganges which flows past the towns of Rampore and 
Pubna. For my purpose, however, the rivers Hurreegonga and Comer may be fairly 
considered as one stream, flowing from the Ganges and, after fertilizing a large tract of 
indigo country, flowing into it again, much lower down (eighty miles) than its origin, 
about the village of Mandarapore. f 
In the summer, owing to the great silting up of the banks of the Ganges at the place 
where the Hurreegonga takes its:rise, but little water flows into the Ganges from this 
Tiver. 
The water from the Ganges for about thirty miles below Mandarapore (as far as m. 
reesaul) is considered perfectly fresh; at this distance down the river the water is at full 
* Vide Prodromus descriptionis animalium evertebratorum que in Expeditione ad oceanum eens epee 
nalem a Republica Foederata missa T. Rogers duce, observavit et descripsit W. Stimpson, 1857. 
t Proceedings of the Dublin University Zoological and Botanical Association, vol. ii. pt. 1. p. 47. 
T 
