122 



MOLLUSCA. 



[Serpulacea. 



arcuated and sharp points; whole exterior surface irregularly 

 wrinkled, both longitudinally and transversely, and of a deep 

 purplish rosy hue on the higher portions. 



Fig. 14, 15, the operculum. 



Found by Dr. Leach, enveloped in sponge, on the Devon- 

 shire coast, and is not uncommon. 



Shells with a bivalve operculum. 



Genus 3. — Clitia. — Leach. 

 Shell a depressed, irregularly-shaped cone, attached by the 

 base, and consisting of four unequal, dissimilar valves, two larger 

 and two smaller, laterally united by the interlocking of their 

 dentated margins ; aperture somewhat trapeziform, laterally 

 placed, and entirely filled by a bipartite operculum, one of the 



pieces of which is irregularly quadrate, and the other nearly 

 triangular. 



1. Clitia verruca, pi. LIII, f. 30. 



Creusia verruca, First Ed., pi. 7, f. 30; Lamarck, V, p. 400; 

 Lepas verruca, Chemnitz, Conch., VIII, pi. 98, f. 834 ; Lepas 

 striata, Pennant, IV, p. 73, pi. 38, f. 7 ; Lepas intertexta, 

 Donovan, I, pi. 36, f. 1 ; Maton and Rackett, p. 2G ; Balanus 

 striata, Montagu, p. 12. 



Shell much depressed, white ; compartments strongly ribbed 

 diagonallv, and oblique to each other; the ribs with fine, trans- 

 verse stria? ; margin of the base irregularly serrated ; aperture 

 pretty large, oblique, and quite closed by the operculum. Dia- 

 meter a quarter of an inch, sometimes a little more. 



Found adhering to shells, stones, &c, on many of the British 

 and Irish coasts ; very common in many localities. 



CLASS FOURTH. 



ANNELIDES. 



Animal with a more or less elongated body, having red 

 blood, and inhabiting a testaceous tube, with which, however, 

 they have no muscular adhesion, but from which they never 

 depart during life. 



ORDER I— SEDENTARIA. 



Animals protected by a testaceous tube, which they never 

 leave during life; branchial placed at one extremity of the body. 



Family I Serpulacea. 



Tube solid, calcareous, and adherent to other bodies. 



Genus 1. — Serpula. — Linnaeus. 

 Shell tubular, narrow, gradually widening towards the aper- 

 ture, and pointed towards the apex; attached irregularly to 

 other bodies ; sometimes wound spirally ; keeled, imbricated, 

 or plain; aperture round, for the most part, or angulated in the 

 ribbed species. 



Section I. — Shells partially attached to extraneous bodies, 

 and in some instances free. 



1. Serpula tubularia, pi. LV, f. 9, 10. 



Serpula tubularia, First Ed., pi. 2, f. 9, 10; Montagu, p. 

 513; Fleming, Edin. Ency., VII, Art. Conch., p. 67, pi. 204, 

 f. 9 ; Brown, Ency. Brit., VI, p. 468. 



Shell round, irregularly flexous, gradually tapering, opaque, 

 white, slightly wrinkled transversely ; always adhering by the 

 smaller end to stones or other extraneous bodies ; ascending in 

 a considerable angle from the base, in some instances nearly 

 perpendicularly, and in most instances almost straight. 



Inhabits the sea at Torcross, Devonshire, Zetland, and is not 

 uncommon in the Clyde at Rothesay, and other places in the 

 estuary of that river. 



2. Serpula contorta, pi. LV, f. 4. 

 Serpula contorta, First Ed., pi. 2, f. 4. 



Shell round, tube irregularly contorted, slightly spiral, and 

 hardly tapering, unattached; cream-white, with irregular, trans- 

 verse wrinkles. 



Found at Dunbar, by General Bingham. 



3. Serpula spiralis, pi. LV, f. 6. 

 Serpula spiralis, First Ed., pi. 2, f. 6. 



Shell a spiral, subtriangular tube, with a carinated ridge along 

 its superior portion, which projects in a tooth-like form over the 

 subtriangular aperture. 



Found at Dunbar, by General Bingham. 



4. Serpula perversa, pi. LV, f. 7- 

 Serpula perversa, First Ed., pi. 2, f. 7. 



Shell a reversed spiral, subtriangular tube, with a carinated 

 ridge along its superior portion, and projecting beyond the aper- 

 ture, which is slightly subtriangular. 



Found at Dunbar, by General Bingham. 



