I8. - Hentz's Descriptions of the 
n, body of the animal ; o, the residue of the vitellus; z, single cell of the 
: outer envelop; z, single cell of the yolk residue. 
Fic. 32-35. Monostomum mutabile, after Siebold. 
Fic. 32. The embryo enclosed in the egg; a, the external membrane 
of the egg; b, the envelop; c, the embryo inside ; d, the eyes 
Fic. 33. The embryo surrounded by its envelop. 
Fic. 34 and 35. The embryo, after having left the envelop 34, in profile ; 
35 in front. 
Fic. 36-43. Embryos of Polynóe squamata, (50 times magnified.) 
Fic. 36. The embryo immediately after being hatched; showing the 
ring of long cilia, 
Fic. 37. The same seen in profile. 
Fic. 38. An embryo of the second day after being hatched. 
Fic. 39. Portions of an embryo, showing the form and the motion of the 
cilia is diam.) 
G. 40. An embryo three days old. 
jx 41. An embryo four days old, when ready to cast off the iren 
Fic. 42. An embryo at the moment when it casts off its envelop. 
Fic. 43. An embryo after having cast off the envelop. 
Fic. 43. a. Remains of the envelop. 
Arr. II. — Descriptions and Figures of the Araneides of 
the United States. By NicHuonas MarceLLus Hentz, 
Tuscaloosa, Alabama. 
[Continued from Vol. V. page 479.] 
Tribe IV. -MAMMULOSZE. Abdomen with various 
projections. 
31. EPEIRA ? PENTAGONA. 
Plate III. Fig. 1. 
Description. Varied with yellowish and whitish, marked 
with black spots; cephalothorax elongated, external eyes 
separated ; abdomen with four tubercles; feet 1. 2. 4. 3.; 
the first and second much the longest. 
Observations. This may constitute the type of a new 
Nov. 1848. 
