682 
VERMES. 
body walk 3 (external-longitudinal, circular, and internal-longitudinal); 
proboscis with 6 coats, viz., external-elastic, longitudinal and accessory 
bands, circular, basement, and glandular (in Borlasia^ 4) ; snout with a deep 
lateral fissure on each side in connection with the cephalic sac, which is 
rounded and devoid of long tubes or ducts posteriorly. Circulatory 
system consisting of 3 great longitudinal trunks, 2 lateral, and a dorsal, 
which frequently anastomose by transverse branches, form a rete mira- 
bile in the oesophageal region, and unite in lacunae behind the ganglia. 
5. Linens, Sow. Body more or less elongated, rounded or somewhat 
flattened, and tapered posteriorly; head distinct, spathulate, and gene- 
rally truncate in front ; eyes numerous, arranged along the side of the 
snout anteriorly, rarely absent. Mouth in the form of a conspicuous 
longitudinal slit on the ventral surface. L. marinus, Mont., p. 181, pi. ix. 
& xviii. figs. 1-3 ; gesserensisyLilLvW., p. 185, pi. iv. fig. 2, and pi. v. fig. 
10 ; sanguineus, Rthk., p. 188, pi. v. fig. 2; lacieus, Mont. (MS.), p. 190, 
pi. V. fig. 3 ; hilineatus, D. Ch., p. 191, pi. vi. fig. 1. 
6. Borlasia, Ok. (emend). Body round and massive, not tapered pos- 
teriorly ; snout acutely pointed ; the proboscis extremely slender and 
having only 4 coats (elastic-external, longitudinal, circular, and glandular) ; 
muscles and circulatory fluid tinted reddish. B. elisahethce, sp. n., p. 193, 
pi. vii. figs. 1 & 2 (Herm), 
7. Cerehratulus, Ren. Body generally flattened and thinned at the mar- 
gins ; snout pointed ; eyes in the usual position, but obscure ; proboscis 
with a cross of fibres at each pole in transverse section. C. angulatus, 
Mull., p. 195. 
8. Micrura, Ehrbg. Body not much elongated ; head distinctly 
marked ; snout truncated. Other characters as in Linens ; a soft fili- 
form caudal process, capable of attachment. M. fusca, sp. n., p. 196, 
pi. vi. fig. 3 (Shetland, Herm, off Portugal); fasciolata, Ehr., p. 197, 
pi. vi. fig. 2; purpurea, Dal., p. 200, pi. vii. fig. 3 ; awmw^iaca, Gr., p. 201, 
pi. vii. fig. 4. 
9. Mechelia, Leuck. (emend.). Structure of the rounded body -wall as 
in Lineus. Cephalic fissures absent ; proboscis furnished with only 3 
coats (external-spiral, longitudinal, and glandular). M. usulcata, sp. n., 
p. 202 (Shetland, Herm). 
III. Carinellidce. Lateral nerves placed between the basement layer 
of the cutis and the external (circular) muscular coat of the body- wall 
(in Carinella), or in the substance of the longitudinal layer close to the 
circular (in Valencinia) ; only 2 muscular coats ; 3 layers in the pro- 
boscis ; no cephalic fissures ; circulatory system consisting of 2 great 
lateral trunks. 
10. Carinella, Johnst. Body elongated, tapering from the front back- 
wards ; snout wider than the rest of the body, bluntly rounded in front ; 
mouth sometimes small. C. annulata, Mont., p. 203, pi. vii. fig. 5, and 
pi. viii. ; linearis, Mont. (MS.), p. 206 (South of England, Hebrides). 
11. Valencinia, Qu. (emend.). Snout shaped as in Lineus lacteus, with 
a row of eyes on each side ; mouth forming a distinct fissure a consider- 
able distance behind the ganglia. F. line[i\formis, sp. n., p. 207, (Shet^ 
land). V. armandi, sp. n., McIntosh (8), Southport. 
