_ which they are attached is very large, nearly as long 
SE Be ete A ta 
Botany and Zoology. 445 
eating epochs in the growth of the shell. Marginal sets of the mantle 
- well developed, those on either side at the extremity longer than the rest, 
equalling in length one-third the width of the shell. There are two black 
spots on the margin of the mantle at the extremity. Peduncle in life 
three times as long as the shell, thick, (one-third width of the shell,) at its 
point of attachment, but rapidly tapering and becoming very slender and 
hyaline, with an opaque axis or central cord; extremity glutinous and 
covered with adhering sand. Length of the animal 3°5; length of shell, 
0:92; width of shell at the middle 0:35; at extremity, 0°21; way 
between middle and summit, 0°26 ine 
7 . 
Peale informs me that this part in the Lingula anatina forms a favorite 
recent species, ten in number, are all inhabitants of the Pacific. 
‘am. Porcellanidae. Body subcylindrical. 
concave superior margin. Antennulz placed immediately beneath the 
as broad, 
in front, and truncate behind. Chelipeds small, subeylindrical, much 
shorter than the carapax; hands weak. Ambulatory feet subcylindrical ; 
dactyli curved, setose, nearly as long as penult joint. Abdomen narrow, 
UCERAMUS PR&ELONGUS. Carapax regularly curved like a segment of 
pax ; 
- &eylinder, above glabrous, and minutely striated transversely ; striz curved 
ard at the sides, Inter-orbital front one-third the width of the cara- 
the chelipeds ; those of the first pair smaller. Jang about three-fourths 
of an inch. Dredged on shelly ground in 4 to 8 fathoms. 
* We understand that is specimen of Lingula from the coast of South 
Carolina in isosbtlen'et cw ple Not having access to this specimen, we are 
unable to say whether it be identical with ours or not. 
