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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 with longitudinal ribs or stricc. 
Plate I. Fig. 3. D. elephantinum. (Idem. — Linnaeus.) [Mrs. Mawe’s Cabinet.] 
(б) Tube smooth , or without ribs or striae. 
Plate I. Fig. 2. D. politum. (Idem. — Linnaeus.) [Mrs. Mawe’s Cabinet.] 
B 
