134 SYNOPSIS OP FAMILIES, GENERA, AND SPECIES. 



lateral trunks. The proboscis has externally a double elastic layer, a thick longitudinal coat, and 

 lastly, a glandular layer. 



The family of the Cejphalothricidm deviates still more from the typical group. The arrange- 

 ment of the ganglia differs, and the commissures are separated by a considerable antero-posterior 

 interval. The lateral nerve-trunks lie between the longitudinal muscular coat and an isolated 

 inner band of fibres having the same direction. The proboscis is supplied with acicular papillae, 

 and seems to have an external circular and internal longitudinal layer. The snout is devoid of 

 fissures. The circulatory system is composed of two great longitudinal trunks, whose contents 

 communicate behind the ganglia and at the tail. Oviparous ; the young undergoing no distinct 

 metamorphosis, though they have eyes, whereas the complete animal is generally eyeless. 



VI.— SYNOPSIS OP FAMILIES, GENERA, AND SPECIES. 



Order.— NEMERTINEA. 



Sub- Order.— ENOPLA. 



Proboscis furnished with stylets. 



Fam. I. AMPHiPORiDiE. — Ganglia rather rounded. Lateral nerves within the muscular layers of 

 the body-wall. Mouth opening in front of the ganglionic commissures. 



Sub-Family, AMPHIPORIN^. 



Proboscis proportionally large. 



Genus I. Amphiporus, Ehrenberg. — Eyes more or less numerous, but never arranged in a square. 

 Body rather short, sometimes flattened. 



1. A. lactifloreus, Johnston. — Eyes grouped in two series on each side; body white, roseate, or 



greyish. 



2. A. pulcher, Johnston. — Eyes well defined and numerous, irregularly grouped on each side, 



A central reserve-stylet in the proboscis. Cephalic furrows slightly branched. 



3. A. spectabilis, De Quatrefages. — Head spathulate, peculiarly narrowed posteriorly. Eyes 



forming two long rows on each side. Cephalic furrows conspicuously branched. 

 Longitudinally striped with brown on the dorsum. 



4. A. hastatus, n. s. — Snout short and hastate, with a grooved dorsal ridge. Eyes indistinct. 



Brownish-yellow, with white grains on the snout. 



5. A. bioculatus, n. s. — Snout acutely pointed, with a cephalic furrow — forming an angle 



directed forward on the dorsum — at its posterior boundary. Two eyes at the tip of the 

 snout. 



