PLATE IX. 



J+B. Integument and basement membrane. 



M. Body musculature. 



Ot. Gelatinous tissue. 



Prs. Proboscidian sheath. 



LN. Lateral nerve-stem. 



Int. Intestine. 



Gs. Genital sacs, in many cases not yet in open com- 

 munication with the exterior. 

 Prs.div. Lateral diverticula of proboscidian sheath. 

 br. Blood-vessel. 



Figs. 1-6. Diagrams of different Hoplonemertea to elucidate (1) the relative extent of integument, 

 muscular body-wall and internal gelatinous tissue; (2) the situation of the genital glands 

 and their respective openings to the exterior. 



Fig. 1. Drepannphorus lankesteri, n. sp. Middle of the body, diverticula of proboscidian 

 sheath included in the section. 



Fig. 2. Drepanophorus lankesteri, n. sp. Towards the extremity of the tail, between two 

 pairs of diverticula of the proboscidian sheath. 



Fig. 3. Amphiporus marioni, n. sp. 



Fig. 4. Amphiporus moseleyi, n. sp. Numerous genital sacs, both dorsal and ventral, 

 contained in one transverse section. 



Fig. 5. Drepanophorus serraticollis, Hubr. 



Fig. 6. Drepannphorus serraticollis, Hubr. In a further advanced stage of ripeness of 

 the genital products (with distinct genital openings to the exterior); the diver- 

 ticula of the proboscidian sheath not touched in this section. In all these 

 sections the longitudinal blood-vessels are indicated, the median one below the 

 proboscidian sheath, the lateral ones close to the lateral nerve-stems. In 

 Amphiporus moseleyi the lateral nerve-stems are seen to lie above, in Drepano- 

 phorus, below the intestinal caeca. 



Fig. 7. Amphiporus moseleyi, n. sp. Diagram of a horizontal section through the body. The 

 intestine and its caeca are dark grey, the generative casca light grey. The latter are 

 seen to be very numerous and in no way regularly or metamerically arranged. 



Fig. 8. Amphiporus moseleyi, n. sp. A specimen with flattened ventral surface. Natural size. A 

 whitish line from the tip of the snout backwards along the lateral margin marks the exterior 

 openings of the lateral glands (cf. PI. XV. figs. 11, 12). 



Fig. 9. Amphiporus moseleyi, n. sp. Head, seen from below. Longitudinal slit both for the 

 intestine and the proboscis ; terminal transverse sensory groove and lateral bent grooves 

 into which the cavity of the posterior brain lobe opens. 



Fig. 10. Drepanophorus lankesteri, n. sp. Diagram of the principal features of the nervous system. 

 B, brain-lobes; p. Br, posterior brain-lobes (side organs) with their cavity opening to the 

 exterior at e.o; CepJi.ne, numerous cephalic nerves to the tip of the head, the eyes, &c., 

 only a few of them are here indicated in outline ; Pm, nerves for innervation of the pro- 

 boscis (they are more numerous than is here indicated); Va, outline of vagus nerve 

 springing from the lower brain-lobes and running forwards towards the oesophagus. The 

 latter passes beneath the brain-lobes and their double commissure, but above the ladder 

 commissures (Comm), which metamerically unite the longitudinal nerve-stems (LN) below 

 the intestine ; pe.ne, peripheral nerves springing from these nerve-stems. 



Pig 11. Amphiporus moseleyi, n. sp. Stylet and accessory darts. A and h,V, the central stylet and 

 its two accessory sacs, in position ; b", bases of two accessory darts, viewed laterally (figure 

 to the left), and perspectively (figure to the right). 



