Botany and Zoology. | 75 
species whatever. The most prolific region was in water about 
ten fathoms deep. W. G. F. 
7. Leleie Specie nei Gruppi affini raccolte a Borneo. By Vin- 
cenzo Cesati. Prospetto delle Felei raccolte dal Signor O, Beccari 
nella Polinesia. By Vincenzo Cesati, Napoli.—The former article 
forms a pamphlet of forty-one pages, with four plates, in pea the 
writer enumerates the higher er yptogam s of Borneo and describes 
a number of new species. The latter aetials is much shorter and’ 
contains descriptions of about thirty new species and = es. 
w. 
. Notes on Botrychium simplex nner ; by GrorcE E Day 
opel 1877. Salem, Mass. 4to, pp. tab. 2.- o. Bacrehiaa. 
simplec i is a little Fern which was sch atari docnaag and figured 
in this Journal in 1823 (vol. vi, p. 103), by President Hitchcock. 
For many years it was very little known, and was confused with 
several other species of the same genus. "Dr. Milde, in vol. xxvi, 
of the Nova Acta Acad. Nat. Curiosorum, was the first to cle early 
define it, to associate with it forms more ‘hi ighly developed than 
the specimens known to hae Hitchcock, and to illustrate the 
species with ny se its several forms and Speen fe cea 
results of his studies upon other species. D. C. EATON. 
that when collecting fossils he finds large numbers of Trilobites 
on their back;* from this he argues that they died in their nat- 
ural position, and that when living they probably swam on their 
acks. He mentions, in support of his view, the well known fact 
that position. I have for several summers kept young horse-shoe 
erabs in my j and have noticed that besides thus often swim- 
hon on their Reoke, they will remain in a similar position for 
hours, perfectly quiet, on the bottom of the jars where mg are 
kept. When disy cast their skin it invariably keeps the same 
attitude on the bottom of the jar. It is not an uncommon thing 
to find on beaches, where Limulus is common, hundreds of skins 
thrown up and left dry by the tide, the greater part of which are 
turned on their backs, ‘An additional point to be brought for- 
Sea Lye. “Wat Hist., -xi, p. 155, dein: Twenty-eighth Report N. Y. State 
Museum, Dec., 1876. : 
