136 SYNOPSIS OP FAMILIES, GENERA, AND SPECIES. 



Sub-Order.— ANOPLA. 

 Proboscis without stylets. 



Family II. Lineim. — Ganglia elongated. Muscular layers of the body-wall three in number, 

 viz. external longitudinal, circular, and internal longitudinal. Proboscis furnished with 

 five coats, viz. external elastic, longitudinal and accessory bands, circular, basement and 

 glandular layers. Snout with a deep lateral fissure on each side. 



Genus V. Lineus, Sowerby. — Body more or less elongated, rounded or somewhat flattened, and 

 tapered posteriorly. Head distinct, spathulate, and generally truncate in front. Eyes 

 numerous, arranged along the sides of the snout anteriorly ; rarely absent. Mouth in 

 the form of a conspicuous longitudinal slit on the ventral surface. Other characters as in 

 the Family. 



1. Z. marinus, Montagu. — Eyes numerous, deeply set in a marginal row on each side of the 



snout, Of a dull olive or blackish colour, more or less distinctly striped longitudinally. 



2. Z. gesserensis, 0. F. Muller.— Eyes numerous, marginal. Snout distinctly wider than the 



rest of the body. Greenish-olive or reddish-brown. 



3. Z. sanguineus, Jens Rathke.— Eyes more regularly arranged than in the former; snout 



narrower. Body more elongated, and of a reddish or reddish-brown hue. Regenerates 

 easily. 



4. Z. lacteus, Montagu, MS.— Snout similar to the foregoing, but the mouth is separated from 



the ganglia by a much longer interval. Body reddish anteriorly, pale posteriorly. 



5. Z. bilineatus, Delle Chiaje. — Snout rounded anteriorly; eyeless. Body of a pale brown or 



dull pinkish colour, with a white stripe on each side of a dorsal median line. 



Gems VI. Borlasia, Oken. — Characters as in Lineus, but the proboscis is extremely slender, 

 and has only four coats, viz. elastic, longitudinal, circular, and glandular. 



1. B. Elizabeths, n. s. — Snout pointed anteriorly; eyeless. Body generally contracted into a 

 rugose mass posteriorly. Head pale, faintly streaked with greenish brown. Body 

 marked with deep madder-brown. 



Genus VII. Ceuebratulus, Renier.— Body generally flattened, and thinned at the margins. 

 Eyes in the usual position, but obscure. Proboscis with a cross of fibres at each pole in 

 transverse section. 



1. C. angulatus, 0. F. Muller. — Snout somewhat pointed. Body much flattened ; brownish. 



