Zoology. 859 
branchial cloaca and pass thence, being fertilized 2 transitu-and 
lomic fluids, into the outer cloaca, whence 
eS. suc Fic. 2.—Explanation: Oe, cesophagus. The tri- 
angular labial palps have been removed. ad, anterior 
adductor muscle, in transverse section. > foot. <3, 
portion of medial chambe 
= 
2: 
a) 
im 
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a . 
SS, 
oo 
oO 
5 
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l with the 
' as is found 
» and U. penicillatus—is gelatinous in nature 
us, and lasts, at least in the Coosa and Cahawba 
Sg the Verdigris River, Arkansas. 
2d ceri. “Ppeared in the Four. Phil. Acad. Natu- 
Te Series, vol. ii, PL XXIV, Fig. 1 (185 1). Two _ 
