PUNNETT AND FOESTEE OOOPEE— NEMEETEANS. 9 



13. Linens indicus, sp. n. (Plate 1. fig. 2.) 



Locality. Amirantes, from 19 fathoms. 



A single rather slender specimen, 85 mm. in length. The hind end is pointed, the 

 head spatulate and mouth large. The colour of the spirit-specimen is pale green. On 

 the dorsal surface there is a thin white collar running across the brain-region. 



There is a well-developed gelatinous layer, but the rest of the cutis is much reduced. 



The vascular system shows a well-marked cephalic loop. The median dorsal vessel 

 leaves the proboscis-sheath at the level of the right nephridial duct. 



The rhynchocoel extends a good way throughout the body, though it does not 

 reach the hind end. 



The excretory system begins at the level of the mouth-ending ; in addition to the 

 usual pair of ducts there is an additional one on the left side. 



There is no frontal organ. 



The head-slits extend rather more than halfway to the middle line ; they are not 

 prolonged past the brain-region. 



Numerous small eyes are present on either side. 



14. Lineus crosslandi, sp. n. (Plate 1. fig. 6; Plate 2. fig. 16.) 



Locality. Zanzibar (Crossland Coll.). 



A single specimen of a small species 65 mm. in length and 3 mm. in breadth. 

 Reddish in colour when preserved, it was probably bright red in life. The tail ends in 

 rather a fine point, but no caudicle is visible. The extruded proboscis measures 

 45 mm. 



Tiie epithelium rests on a very fine basement-membrane, under which is a delicate 

 layer of circular muscle-fibres. The cutis-glands are comparatively small, and among 

 them are found a certain number of muscle-fibres. A fairly well-marked gelatinous 

 layer is present, and constitutes more than half the total thickness of the cutis 

 (PI. 2. fig. 16). 



The mouth is large, and begins just before the termination of the cerebral organs. 



The vascular system has a well-marked cephalic loop. Owing to internal disruption 

 it is not possible to state where the proboscis-vessel leaves the sheath. The system 

 generally is characterised by the presence of large oval nucleated corpuscles. 



The proboscis has three muscular layers, the outer longitudinal being much attenuated. 

 Both muscle-crosses are present. 



The excretory system is found in the mouth-region, and abuts upon the vascular 

 lacuna which partly surrounds the cerebral organ. There is a single pair of ex- 

 ceedingly well-marked ducts just behind the mouth. 



The testes extend dorsally nearly to the rhynchocoel and ventrally to the blood- 

 vessel. The ducts pass out just above the nerve-cord. 



The brain is of the usual type. 



The head-slits reach barely halfway to the middle line and end abruptly before the 

 posterior level of the cerebral organ. 



SECOND SEEIES. — ZOOLOGY, VOL. XIII. 2 



