818 Transactions,—Zoology. 
emarginate inferiorly ; sete minute in single rows; colour reddish-brown, 
finely longitudinally striated with lighter ; length two inches, 
Order CHÆTOPODA. 
Body not presenting distinct regions; branchiw dorsal; sexes distinct ; 
limbs tubular, setigerous, Marine. 
Family ApHropitips. 
Segments unequal, with dorsal, shield-like elytra ; head lobes developed, 
with a single tentacle and lateral antenne and palpi; eyes sessile or 
stalked ; gills small, simple; epipharynx generally with two upper and two 
lower teeth and jaws. 
Genus Aphrodita, Linnseus. ; 
Head with three antenns, two eyes, and a median earunele or tubercle; 
buccal segment rudimentary without appendix; all the feet more or less 
covered with hairs, no barbed bristles ; elytra 12-15 pairs alternating with 
the superior cirri; proboscis unarmed, or with rudimentary cartilaginous 
teeth. 
A. TALPA, Quatrefages, Hist. Nat. des Annelés, I., p. 196, pl. 6, f. 2. 
Median tentacle very short, laterals long; body of 82 segments; feet 
enveloped in hairs; elytra 80, rounded, small; the whole back covered 
with dirty, brown hairs. 
A. squamosa, Quatrefages, l.c. I., p. 201. 
Head small, distinct, hidden by the prominent elytra; median antenna 
short, thick, truncated (?); laterals twice as long, slender ; tentacles short; 
body of 27 segments, moderate, elongated; feet apparently one-oared, 
prominent; elytra 24, large, rugose, robust, covering the whole body; 
superior cirri longish, on a thick, compressed, swelling; hairs short, not 
covering the elytra; branchiæ more or less conical, and separated tubercles. 
| Genus Polynoe, Savigny. 
Head distinct with 9 antenne and 4 eyes; buccal ring indicated by the 
presence of two pairs of tentacles, the superior of which are bifurcate ; the 
inferior longer, thicker, and simple. Feet more or less evidently biramous ; 
the setigerous tubercles on a common peduncle; elytra alternating with 
the superior cirri of the feet, covering the whole length of the back; pro- 
boscis with two pairs of horny jaws. 
P. avuckLANDICA, Schmarda, Neue Wirbelloser Thiere, p. 158. 
Body long, greyish-yellow ; segments 60; tentacles 7; elytra oblique, 
P. uacnoLePIDATA, Schmarda, le., p. 155, pl. 86, f. 306. . 
| Body flat, brown; elytra 15 pairs, large, oval, or suboval, greyish- 
" 
ccu. OW 
