JASMINEIRA ELEGANS. 301 
and are directed downward and backward, or just in front of the tail, downward and forward. 
In these elongated bristles the wings are indistinguishable. A few shorter bristles, probably 
in process of development, occur in these tufts. 
The striated shafts of the long anterior hooks (Plate CX XX, fig. 1c) are even more tapered 
at the insertion than in C. Fawveli, and they increase in diameter upward to the shoulder, 
which gently diminishes to the stout neck. The main fang leaves the throat nearly at a 
right angle, and on the crown above it, in lateral view, are five or six teeth. The neck and 
shoulder of these hooks have a forward curve, so that the head is carried backward. The 
posterior hooks (Plate CX XX, fig. 1d) have a convex anterior and a concave posterior outline, 
but the base is not bent backward as in the ordinary avicularian forms. The main fang 
~ leaves the throat at somewhat less than a right angle and is strong and sharp. Above it is 
a series of four or five or more small but distinct teeth. The slightly curved neck dilates 
a little as it merges into the stunted shaft or base, which has a slight flexure backward, the 
character of the hook bemg thus diagnostic and different from those of species of Chone 
hitherto described. In a variety from Finmark the bases of these hooks are tapered into 
shaft-like processes, and the whole series forms in each foot an elegant fan. They are in 
a single row. 
Genus CLXXIII.—Jasminetra, Langerhans, 1880. 
Characters as in the Family, only the anterior region has single rows of long hooks, 
whilst the posterior region has avicular forms as in Sabella. The collar is like that in Huchone, 
but the ventral median curves are less marked, though longer. Langerhans places the genus 
near Dialychone, Claparéde, though the posterior hooks of that genus approach those of the 
Terebellids, whereas in Jasmineira they resemble those of Sabellids. Along with Bispora, 
Dasychone and Laonome it forms an intermediate group between that of Sabella (Spiro- 
graphis, Branchiomma, Potamilla and Sabella) and the Chone-group (Huchone, Chone, 
Dialychone, Oria, Fabricia, Leptochone and Myzxicola). 
1. JASMINEIRA ELEGANS, De St. Joseph, 1894. Plate CXXIX, figs. 4—4e—bristles and 
hooks. 
Specific Characters—Cephalic lobe, on removal of the branchiz, has a mushroom- 
shaped base streaked longitudinally and split im halves. From the ventral edge of 
each half three to four slender, smooth cirri project. Collar well-marked, with a dorsal 
fissure, but an entire ventral edge. Linear eyes on the fused buccal and first segments, 
and two otocysts (De St. Joseph). On the dorsal region of the mouth are two short conical, 
ciliated appendages (antennee of Pruvot and Meyer rather than two large palps), and 
having a green vessel (De St. Joseph). Branchize eight to twelve (De St. Joseph) on 
each side, with a double row of ciliated barbules, and a naked process with a thickened 
base at the tip of each filament. They are tinted green by the blood-vessels and dotted 
with red pigment-specks. The body in spirit has the outline of Chone and is little tapered 
till the posterior third (in the living form it tapers from the collar to the posterior end), 
