Lamarck’s Genera of Shelis. 69 
Shell tubular, irregularly contorted, posteriorly attenuated, 
base sometimes spiral; open at the anterior extremity; a 
subarticulated fissure through its whole length. 
Type. Stlquarta Anguina*. (Serpula Anguina, Linn.) 
Shell tapering, transversely striated, longitudinally furrowed ; 
base spiral, whorls nearly contiguous. Indian Seas. PI. iii. fig. 1. 
7 Species. Recent and fossil. 
Maxpania. (2 Genera). 
1. Clymene. 
,Body tubular, slender, cylindrical, on each side a row of 
bristly mammille. 
Anterior extremity blunt, oblique, with a semicircular border 
projecting beyond the mouth; mouth transverse, plaited, bi- 
labiate ; lower lip very turgid. No tentacula. 
Posterior extremity dilate, funnel-shaped; border divided 
by equal and acute indentations ; internally elevated radii 
(branchize?) extending to the anus, which occupies the bottom 
of the funnel, and is surrounded by fleshy papille. 
Tube slender and open at both ends, coated externally with 
small sand and fragments of shells. Only one species. 
Clymene Amphistomat. Red Sea. 
2. Dentalium{. 
Body tubular, very imperfectly known; anterior extremity 
terminating in a conical button, surrounded by an annular 
membrane. Mouth terminal. 
Posterior extremity dilate, spreading orbicularly ; border 
divided into five equal lobes. 
Tube testaceous, nearly regular, slightly curved, gradually 
diminishing towards the posterior extremity ; open at both 
ends, 
Type. Dentalium elephantinum§. (Idem. Linn.) 
Tube, decagonal, subarcuate, striated. Indian Seas and Europe. 
Pl. iii. Fig. 2. 21 Species. Recent and fossil. 
* From anguis, a snake. 
+ From ay¢q: and cloxa, signifying open at both ends. 
t From dens, a tooth. § Elephant’s, 
F.2 
