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ANNULATA 
Forms the Ninth Class of Lamarck's Division of Animal Nature . 
SEDENTARY ANNULATA 
Composes the Third Order of the above Class. They are usually found attached to 
marine substances, and inhabit membranous or horny tubes ; more or less incrusted with 
grains of sand or fragments of shells; or are solid, calcareous, and homogeneous: and are 
divided into Four Families, viz. — Dorsalia, Maldania, Amphitritea, and Serpulea. 
DORSALIA. — 2 Genera. 
Arenicola. — Has no shell. 
Siliquaria. — Shell tubular, irregularly twisted, tapering towards the posterior end, which 
is sometimes spiral; anterior extremity open; and a longitudinal subarticulated 
fissure throughout its whole length. 
Plate I. Fig. 1. S. anguina. (Serpula anguina. — Linnaeus.) 
MALDANIA. — 2 Genera, 
Clymene. — Tube slender, open at both ends, the exterior incrusted with sand and pieces 
of shells. 
[I have not been able to procure a Figure of the Clymene amphistoma; of which species only the genus 
is composed.] 
Dentalium. — Tube testaceous, nearly regular, slightly curved, gradually tapering to- 
wards the posterior end, open at both extremities. 
(а) Tube milk longitudinal ribs or strice, 
Plate I. Fig. 3. D. elephantinum. (Idem. — Linnaeus.) [Mrs. Mawe’s Cabinet.] 
(б) Tube smooth , or without ribs or strict. 
Plate I. Fig. 2. D. politum. (Idem — Linnaeus.) [Mrs. Mawe’s Cabinet.] 
B 
