Zoology and Botany. 67 
63 of water. The mineral, a variety of opal, was collected by 
Dr. A. C. Peale, and is called by Mr. Endlich pealite. 
13. Mineralogia della Toscana; Studii di ANronto D’ AcHTARDI, 
Ajuto al Prof. Min. e Geol. nell Univ. di Pisa.—The second vol- 
ume (404 pages, 8vo) of this very thorough work on Tuscan miner- 
alogy and crystallography has been issued. 
14. Aragotite, Metacinnabarite-—F. E. Duranp, in the Proceed- 
ings of the California Academy of Sciences, iv, 218, has given the 
to a bright yellow substance, impregnating a 
r 
name Aragotite 
crystalline siliceous dolomite, and occurring with cinnabar. It 
Durand, on p. 219, figures two crystals of metacinnabarite, 
and states that the form is probably orthorhombic. The figures 
represent a rectangular prism with replaced angles. 
Ill. ZooLtoagy AND BorTany. 
external maxillipeds have almost exactly the same structure as in 
ey adult Ocypoda, and, as in the adult Ocypoda, there is a tuft 
ie self collected it, late in August, at Fire Island Beach, Long 
Siand. In the largest specimen from the last locality the carapax 
d. 
* Journal Acad. Nat. Sci. Philadelphia, vol. i, p. 157, 1817. 
t Crustacea Wilkes’ Expl. Exped., plate 31, fig. 6. 
