- 1892.] Zoology. 705 
attempt to give titles of even the most important of the literature on 
the subject.—H. W. Norris, Grinnell, Iowa. 
EXPLANATION OF FIGURES, PLATE XX. 
Abbreviations used. 
, archesporium ; ax, daughter cells of archesporium; amt, antipodal cells; axf, 
iis bundles of the axis of the flower; z, embryo-sac; em, embryo; end, 
endodermis ;” esf, endosperm; f, funiculus; 7, integument; #, nucellus; 2, ovule, 
of, fibrovascular bundle of ovule; ov, cavity of ovary; v, part of vermiform extension 
of ey sgh of an antipodal cell 
Figs. 1-16 are of Grindelia EERUN 
Fig. 17 is az Helianthus annuus. 
ZOOLOGY. 
Notes on a Nematode Parasite from the Chipping Sparrow 
(Spizilla socialis)—I have received from Mr. Wm. B. Marshall, 
any, N. Y., a parasite from the thoracic 
cavity of the chipping sparrow which ap- 
pears to be new. 
The sparrow was shot by Mr. Marshall on 
May 14, 1892, and the worm was found 
lying directly against the heart of the bird. 
The color of the worm while alive was a 
brilliant red. It is a male; the head is 
damaged but otherwise the specimen is 
perfect. 
Although the diameter of this specimen is 
proportionally many times 5 saa nea that 
of any recorded species of Trie the 
Fic. 1. body being not at all hair-like ; adbhceg 
the posterior spicule and its sheath present some difficulties when com- 
pared with descriptions of the various species of Trichosoma and the 
related genus Trichocephalus, I prefer to refer the specimen to the 
former genus, to which it is certainly closely allied, rather than to 
erect a new genus for its accommodation. I therefore place the speci- 
men provisionally in the genus Trichosoma and propose the name 
Trichosoma rubrum for it. 
The specimen has the following characters: Body cylindrical, with 
somewhat yielding walls, and presenting three distinct regions; an 
