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SIDNEY F. HARHER. 
of brood pouch, el. Epithelial cell of ectoderm, em. Embryo, ep. Epiblast. 
epst. Epistome. f Foot. fbr. Fibrous part of brain (or “ dorsal organ ”). 
fg. Foot-gland, fgd. “ Duct ” of foot-gland, fl. Flagellum of flame-cell. 
ga. Ganglion of adult, gac. Ganglion-cell. gas. Ganglion of posterior sense 
organ of L. crassicauda. gc, gc 1 , and gc 2 . Gland-cell. hst. Hypoblastic 
outgrowth of stomach, hyp. Hypoblast. I. Parasitic Infusorian, int. Intes- 
tine. 1. “ Liver-cells ” of stomach. 1st. Lateral wing of stomach, m. 
Mouth, me. Mantle cavity, rues. Mesoblast. mus. Muscle-cell. n. Nucleus. 
nv. Nerve. o. Eye. ee. (Esophagus. cec. (Esophageal commissure, og. 
Oral groove, ot. Position of ovary or testis, ov. Ovary, ovd. Oviduct. 
p. External aperture of female generative organs, pm. Pole-cell of mesoblast. 
ps. Posterior sense organ of L. crassicauda. rec. Rectum, s. Sucker. 
sc. Sense-cell. sg. Position of subcesophageal ganglion of embryo, st. 
Stomach, std. Stomodseum. t. Tentacle. tes. Testis, tga. Tentacular 
ganglion, v. Vestibule, or vestibular invagination of embryo, va. Aperture 
of vestibule. vd. Vas deferens. vm. Vitelline membrane, vs. Vesicula 
seminalis. vt. Vitelline body in ovum. z. Junction of stomodamm and 
mesenteron of embryo. 
PLATE XIX. 
Fig. 1. — Loxosoma crassicauda. Calyx, seen from the posterior side 
(living) to show the nervous system ; the cilia of the tentacles are not repre- 
sented. The figure is combined from numerous sketches of the different parts 
of the neiwous system, made from living specimens or from glycerine prepara- 
tions. The individual represented has neither buds nor generative organs. 
st. Stomach, ga. Ganglion. A full explanation of the figure is given in the 
text. 
Fig. 2. — L. Leptoclini (new species). An entire animal, from the 
anterior side. 
Fig. 3. — L. crassicauda. The whole of the posterior ectoderm cells of 
the calyx, after treatment with silver nitrate, ps. One of the posterior sense 
organs. 
Fig. 4. — L. crassicauda. A posterior sense organ, after the action of 
silver nitrate, osmic acid, and picro- carmine, ps. is the actual sense cell, 
situated at the apex of a rounded papilla formed by three ordinary ectoderm 
cells. (From a nearly mature bud.) 
Fig. 5.— Pedicellina echinata. A portion of a tentacle, from a pre- 
paration treated with osmic acid and picro-carmine and mounted in glycerine. 
The tentacle is seen in optical section, el. outer ectoderm of the tentacle. 
Fig. 6. — Loxosoma pes. A sense cell in connection with two ganglion- 
cells. (From a glycerine preparation.) 
Fig. 7. — L. crassicauda. A portion of the edge of the calyx (silver 
nitrate, osmic acid, and picro-carmine), showing the apertures {age.) of the 
