JASMINEIRA ELEGANS. 303 
and marked externally by lines or grooves. From the ventral edge of each half three or 
four slender, smooth cirri (four to six, De St. Joseph) project. A well-marked collar is 
present with a dorsal fissure as in Chone, and an entire ventral margin. De St. Joseph 
describes linear eyes on the fused buccal and first segment, but these were not observable in 
the spirit-specimens. The number of the branchiz is from eight to twelve on each side and 
they show two chordoid cells in transverse section. They have a double row of ciliated 
barbules, and terminate in a naked process with a thickened base. 
De St. Joseph observes that the foregoing fused segments have, besides the eyes, two 
branchial hearts, two red thoracic organs debouching by a common canal at the base of the 
branchiz dorsally, and two otocysts with trembling otoliths. Fauvel,’ however, states that 
in the closed otocysts, to which group those of Jasmineira belong, the “trembling” is due to 
Brownian movement only, as there are no cilia. 
The body, which im spirit is about an inch in length, has the outline of Chone, and is little 
tapered before the posterior third. It ends in a slender tip with a conical papilla above the 
anus. The anterior region consists of nine segments, the posterior of twenty-four or twenty- 
five segments or even more (De St. Joseph gives a total of forty). The ventral groove cuts 
through the right edge of the eighth ventral shield in its progress to the dorsum. The ventral 
shields commence anteriorly by two small ones, and the next seven, which are entire, rather 
‘increase from before backward. The scutes of the posterior region are in pairs, being 
distinctly separated by the broad ventral groove. Diminishing in size they become invisible 
on the minute terminal segments. The first bristle-tuft is small and occurs near the posterior 
border of the united buccal and first segments. It consists of simple, but by no means feeble 
bristles, the shaft being a little diminished at the neck, so that the shehtly curved tip with 
its narrow wings and acute point is clearly differentiated (Plate CX XIX, fig. 4). Nine bristle- 
tufts occur anteriorly. They consist of two kinds, viz., winged capillary bristles with the 
slightly curved and acutely tapered tips (Plate CX XIX, fig. 4a), and spatulate forms (Plate 
CXXIX, fig. 46), the wings of which rapidly dilate, terminate abruptly, and have a short 
median process, often bent. The bristles of the posterior region, which are below the hooks, 
are of one kind only, viz., the simple, winged, tapering forms, but the tips have even in the 
first part of the region a tendency to elongation, and towards the end of the tail the tips, 
(Plate CX XIX, fig. 4c) are extremely attenuate so as to resemble fine hairs, though the 
narrow wings can generally be noticed at the end of the shaft. The distinctions in this 
respect had not been observed by De St. Joseph, 
The anterior crotchets (Plate CX XIX, fig. 4d) have long, curved shafts commencing 
as narrow bases, but gradually dilating to the shoulder, which continues the curve and is 
narrower than the adjoining part of the shaft. The neck is not constricted and the main 
fang leaves it nearly at a right angle, whilst on the crown are numerous small teeth. The 
whole crotchet has the curvature of a bow. De St. Joseph speaks of nine crotchets only, but 
occasionally about twenty are present, and since their narrow bases occupy a compara_ 
tively small area, the group has the form of a fan, the broad tips requiring more space for 
the action of their armature. The hooks of the posterior region differ from those of Chone 
and Huchone and more resemble the type in the Sabellide. They are characteristically 
S-shaped (Plate CX XIX, fig. 4e), the base being smoothly curved anteriorly, convex inferiorly 
Op» cit: 
