256 SIPUNCULUS, SOLEN. 
10—2. Sipuncuus. - Spec. Z. 
audus, tube-worm,) body covered with a close 
skin, and globular at the lower end. In the 
sea anc under stones. 8 inches long. 
saccatus, body covered with a loose skin and 
rounded at the lower end. Appears as if en- 
closed in a bag. 
See MS. P. 
3—4. Siren. Spec. 1. 
Jacertina, (siren,) body eel-form; branchiz rami- 
fied. Mrom 8to 18 inches long. It is said that 
Capt. La Conte has discovered another species 
in Louisiana, - and that another was discovered 
in Maj. Leag’s Expedition. 
See MS. P. ; 
8—9. Sirex. Spec. 26. 
gigas, (tailed wasp,) abdomen yellow at the base 
and tip: body black-biue. 
See MS, P. 
2—2. Sitta. Spec. 12. 
europeea, (nuthatch,) cinereous, beneath reddish ; 
tail-feathers black, the four lateral ones beneath 
tipped with white. 6 inches long. 
canadensis, (american nuthatch,) cinereous, pale, 
rufous beneath ; eyelids white. 5 inches long. 
See Mos. P. 
9—3. Soren. Spec. 23. 
vagina, (razor-sheath,) shell linear, straight. 
roundish, one end margined ; hinge with a sin- 
gle opposite tooth in each valve. ee or7 Pyenes 
longs. 
Sce MS. P. 
