POLYPODA. 
431 
Montagu are different, it is thought proper to notice both here. The fol- 
lowing synonyms relate to the latter species. 
S. intricata, Linn. ; S. vermicularis, Mull., Zool. Dan., vol. iii. p. 9, 
t. 86, f. 9 (animal) ; Mont. Test. Brit., p. 509. >S. Miilleri , Berkeley, 
Mag. Nat. Hist., vol. vii. p. 421, Dr. J. S. vermicularis , Mont., is no- 
ticed in Capt. Brown’s Irish Testacea as found on the Dublin coast and 
in Lough Strangford. 
S. serrulata, Flem. 
In a letter from Mr. J ohn Humphreys of Cork, this species is mention- 
ed under the latter name as “ detected by G. B. Sowerby on Pinnce sent 
him from Cork Harbour.” 
S. vitrea , Fabr. ? 
Adherent to a stone brought up from deep water, on which were also 
Crania 'per sonata and Caryopliyllia Smithii : Youghal, Dr. B. Ball.* Along 
with the last on a stone capped by broken Cellipora cervicornis dredged 
from 40 fathoms, off Whitehead, Feb., 1848. 
S. triquetra, Linn. 
July loth, 1848. — On looking to many of these living near low-water- 
mark, at Cultra, Co. Down, I was much struck in every instance with the 
pure white colour of the recently-formed portion as contrasted with the 
brown colour of the older. It suggested two queries to me : 1st, Is the 
pure white portion the work of this summer, the brown that of last sum- 
mer, which had become discoloured during winter, and consequently does 
the animal not increase its testaceous tube under certain temperature ? 
All the white portion is so pure in colour that it must necessarily be the 
work of the present season. Taking this for granted, we can, 2ndly, tell 
the rate of progress that the species makes in shell-building. 
Genus Filograna. 
F. implexa, Berk. 
Belfast Bay, on tangle roots and covering the limpets which burrow in 
them, W. T. Clifden, Dr. Farran. 
Genus Ditrupa. 
D. subulata, Berkeley. 
The only part of the coast on which this interesting species has hither- 
to been noticed being the North-West (Zool. Jour., vol. v. p. 424), it may 
here be mentioned that specimens dredged by Mr. M‘Andrew from forty 
fathoms, and still deeper water off the Old Head of Kinsale and Cape 
Clear, have been kindly given to me by that gentleman, as have others by 
Mr. Stutchbury (the able Curator of the Bristol Institution), dredged from 
ninety-three fathoms, at a distance of ninety miles (English) due South of 
the last-named locality. Mr. M‘Andrew considers this “ an abundant 
deep-water species,” and has “ obtained it off Scilly in forty-five fathoms ; 
* Vermilia armata, Flem. Edin. Phil. Journ., vol. xii. p. 243: Strangford 
Lough, W. T ., — Serpula contortus, Brown’s MSS. Illus., pi. 2 : Dublin coast, 
Mr. Warren, — are brought by Dr. Johnston under Serpula triquetra , Linn. 
