Of. riers Se Stee Py , ane oe | r ee oe 
See my eee ey ee ae 2 pe a Aas 89 
by Prof. W. B. Rogers’ in Virginia.* Of the real: nature of these 
bodies Iam quite uncertain; they agree however with Pyxidicula, in 
i. separating into two hemispherical. portions. The surface is beautifully 
- marked with rows of circular or hexagonal spots or cells, resembling 
those on the beautiful species of Coscinodiseus which accompany these 
bodies in the same deposit. 
Ganceneinm , 
. Free, carapace simple, bivalve ( silfasasin)s tua exdizuiriegl, 
globular or discoid, producing chains [long welateseas ean s] 
by imperfect spontaneous division. 
- 1. Gaillonella moniliformis. (Pl. 2, fig. 3.) Corpus: dle nae 
cylindrical, short, conical at the sides and truncate, form octangular [?] 
ircular when seen e soak ovaries green, 7; line. Ehr. Meloseira 
j moniliformis, Ktz., Linn., 1833, Pl. 17, fig. 71. M. nummuloides, 
Geev. in Brit. Flora, V, p. ne 
_ This very beautiful species grows only in salt or brackish wa- 
ter, and occurs in great. abundance in various places in the United 
States. I first noticed it several years ago, among specimens 
of Alge from Providence, R. I. I subsequently found it almost 
covering the bottom and shores of Providence Cove at low tide. 
I found it again in vast quantities, in salt ditches near the railroad 
; at Stonington, Conn., where it formed large fleecy masses, some- 
times of several feet in extent. Still more satire I have found 
it at Staten Island, and also, auich sqnyiearprise, sity: miles 9 
the Hudson River near West Point.t. 
"Phe form is not, strictly. octangular, but at. ‘first appears s0 
f the two minute projections of the delicate. mae 
verse ridges seen near the: “ends of each of the two globules be-. 
taasive to a joint. ‘They do not change their form when heated 
heir vast extent, and foe being sie! first infusorial aieipduits eed int li Sos 
ee of a period anterior to the present epoch. Jam ss ee ” tag = Ragart ie 
PRs a pt a8 aut 
Specimens from 
figures drawn by my self of several of the interesting ae found in these beds. 
t The Flora and Fauna of the Hudson River at West Point wotild, in a fossil 
state, be-rather puzzling to the geologist, on aceonnt of the singular mixture of 
marine and fluviatile species. While ears and Cripmogeton grow in such 
Yast quantities in many places as to prevent the passage of a boat, and the sboaees is 
covered w ith fuviatile shells, such as Plenorbis, Physa, &e. > a living state ; 
Reid sersnatessh-v toc plants snnaleke with bunche a Alen a0 
: carpus, &c.,. ofien covered with menine asitic 
phytes and marine infusoria hoectone Gaillonella, Echinella, Naunema, pe 
Vol. xu, No. 1.—Oct.-Dec. 1841. 12 
