SERPULA, SILPHA. 253 



crested ; tail-feathers white at the tips ; legs 

 very long. 3 feet high. 



See MS, P. 



5 1. SEUPULA, Spec. 48. 



spirorbis, (spiral shell- worm,) shell regular, spi i 

 ral, orbicular ; the whorls slightly caniculate 

 above and inwardly, and growing gradually 

 less towards the center. 

 See MS. P. 



13 2. SERTULARIA. Spec, about 60. 



Gperculatd) (coral grass, coral wheat-heads,) deit- 

 tides opposite, pointed and nearly erect, vesi- 

 cles obovate, covered with a lid ; branches al- 

 ternate. 

 See MS. P. 



81. SILPHA. Spec. 122. 



nigosa^ (carrion beetle,) lip dilated, bifid ; jaw 

 one-toothed ; blackish ; shells ridged with 

 three raided lines ; thorax ridged, sinuate be 

 hind. 



See MS. P. 



Remarks. This genus is a remarkable fair 

 specimen for affording the student an opportunity 

 to compare the method of dividing an extensive 

 genus into sections, and that of cutting it up int6 

 new genera, according to Cuvier, Lamarkj La- 

 treille, &c. 



They stand thus : 



Sec. B. Lip rounded, entire ; jaw one-toothed* 

 Or genus MYCETOPHAGUS. 14 species. 



Sec. C. Lip horny > entire; jaw bifid. Or genus 

 3 species, 



