Dr Fleming on the British Testaceous Annelides. ^43 
animals inhabiting shells resembling his Serpula triquetra, “ With a 
smooth termination, grooved on each side for the reception of two cirrM 
placed at the base of the operculum, which is corneous, furnished with a 
bifid style.” 
4. V. serriilata -Shell translucent, triangular, with a serrated dorsal ridge. 
Lid concave, with a smooth margin. Serpula serrulata, Flem. Edin. Ency. vii. 
p. 67. tab. cciv. fig. 8. Adheres to stones, in deep water, in the Zetland seas. 
This species, which I observed in 1809, is remarkable for its smooth, glossy, 
translucent shell, which is flexuous, with a spreading base. The breadth 
near the mouth equals /oths of an inch. The animal referred to by Mon- 
tagu in Sup. Test. Brit, p, 157. No. 1. “ with a smooth and slightly con- 
cave testaceous termination or operculum,” agrees with this species in 
the form of the lid, though the shell itself possesses characters sufficient- 
ly distinct from any of the varieties of his Serpula triquetra which I 
have observed. 
5. V. armata Lid testaceous, and armed with two or three spines in front. 
Serpula vermicularis, Zool. Dan. tab. Ixxxvi. fig. 8 — ^Mont. Test. Brit. Sup. 
p. 157. No. 2. 
6. V. conica — Lid testaceous and conical. Mont. Test. Brit. Sup. p. 157. 
No. 3. 
These two species have been noticed by Montagu as inhabiting shells re- 
sembling his Serpula triquetra. In a manuscript volume of descriptions 
of animals, drawn up by Dr David Skene of Aberdeen, the correspon- 
dent of Linnaeus (Syst. Nat. p. 1267- No. 805.), and of Ellis (Zooph. 
p. 14. &c. and in honour of whom the Millepora Skenii received its de- 
signation), and which I have been permitted to peruse through the kind- 
ness of his relative Alexander Thomson of Banchory, Esq. there is evi- 
dence of his acquaintance with these two species, which he notices in his 
account of the inhabitant of Serpula triquetra : “ Tegmen vel opercu- 
lum est testa parva, orbiculata, hinc convexa, inde (interne) concava, sae- 
pissime spinis tribus armata, aliquando, omnino conica quasi ex spinis in 
unam confluentibus.” 
II. — Extinct Species. 
7. V. crassa. — Shell triangular, acutely conical, with a flat radiated lid. 
Serpula crassa, Sower. Min. Conch, vol. i. p. 73. tab. xxx. Adhering to Bos- 
tellaria macroptera, Highgate, Dr Leach. 
The dorsal ridge is very distinct. The diameter of the mouth is about 
one-fourth of the length of the shell. Its geognostic station is probably 
referable to the London clay. 
Genus SERPULA.— Shell adhering only in part to other bodies. 
Aperture toothless. Lid cartilaginous. 
Species 1. S. tuhularia — Shell at the apex adhering to other bodies, round, 
and, where free, flexuous and nearly cylindrical. Mont. Test. Brit. p. 513 
Flem. Edin. Encyc. vii. p. 67. tab. cciv. f. 9. Adheres to stones and shells on 
many parts of the coast. 
The shell sometimes reaches to one-fifth of an inch in diameter at the 
mouth, and to seven inches in length. According to Montagu (ib. 514.), 
“ the anunal is an AmphUrite^ with between fifty and sixty annulations ; 
the head long, Avhite, barred with pink and green ; on each side a loose, 
scalloped, transparent membrane, capable of contraction and expansion, 
and frequently surrounding the under part : tentacula two, beautifully 
feathered, each originating from a single stalk, placed near to each other 
on the fore part of the head : on one side of each of these stalks are long 
fibres, placed in regular order ; these, again, are furnished on each side 
