CHONE REAYI. 299 
anal appendage. The terminal process of the branchial filament has a central axis and a 
web on each side. It is the rule for the posterior hooks in most species of this 
genus to have higher crowns. The occurrence of a caudal filament in Chone Duneri in 
certain cases, however, makes the distinction less evident, yet the posterior hooks diverge. 
Further examination may reveal intermediate forms, and connect this with known species. 
4, CHONE REAYI,’ McIntosh, 1916. Plate CXXI, figs. 3 and 3a—body ; Plate CXXX, figs. 
1—1d—bristles and hooks; le and 1f—collar-region; Plate CXXXI, fig. 5—tip 
of branchia. 
Specific Characters.—Cephalic plate with a thinner collar than in C. Fawveli, and the 
dorsal edges are turned in, sloped inward and downward, to be fixed to the first segment 
on each side of the middle line. Bases of branchial fans project beyond the collar, and are 
constricted posteriorly so that the whole is mushroom-like. Branchiz have filaments with 
long pinne in a double row which near the base of the smooth terminal process are short 
and give a character to the organs. Body shorter and smaller than in C. Fauveli, the 
largest example having about fifty-five segments, rounded anteriorly, and only flattened 
ventrally at the posterior third as it tapers to the tail, the tip of which projects as a special 
process with an oblique end. From the dorsal groove anteriorly a furrow runs to the end of 
the seventh segment, then slants to the right across the eighth dorsally to the mid-ventral 
line of the ninth, and goes backward to the tip of the tail. The anterior region has eight 
bristle-tufts and seven uncinigerous rows. Anterior bristles in two series, an upper with 
long tapering tips and narrow wings, and a lower, shorter series with wings which are at first 
narrow, then expand into a spatulate region, and gradually cease as narrow wings on each 
side of the terminal filament. The succeeding region of the body has only bristles with 
narrow wings, the tapering tips having a distinct curvature. The tips are much elongated 
toward the tail, and in many of these the wings are not distinguishable. The long anterior 
hooks are much tapered inferiorly, increasing in diameter 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 are five or six teeth. Posterior hooks in a single row with a convex 
anterior and a concave posterior outline. Main fang leaves the throat at less than a right 
angle and is strong and sharp, with four or five teeth above it. The base or shaft is stunted 
with a slight flexure backward. 
SYNONYM. 
1916. Chone Reay’, McIntosh. Ann. Nat. Hist., ser. 8, vol. xv, p. 43. 
Habitat—Between tide-marks, St. Peter Port, Guernsey, under red ascidians; attached 
to stones, between tide-marks, Herm, along with Sabella B.C.; Galway (H. P. Wright) ; 
80 fathoms, St. Magnus Bay, Shetland (J. G. Jeffreys). Abroad it extends to Canada, 
Greenland, and Finmark. 
' Named in honour of Lord Reay, K.'T., LL.D., who since his Rectorship of the University has 
interested himself in the scientific marine work at St. Andrews, and who felicitously opened the 
Gatty Marine Laboratory in a great assembly in 1896. 
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