COLLECTION OP NEMERTEANS FROM SINGAPORE. 131 



is small and round, commences after tlieir termination. No 

 record was preserved of tlie colour in lifetime. In the 

 preserved specimen it is of a pale dirty brown throughout^ 

 and the animal resembles, both in this respect and in its 

 shape, the smaller C. erythrus. No caudal appendage was 

 observed, the posterior end being damaged. 



The epithelium is almost destitute of the small unicellular 

 glands so characteristic of the group. A few deeply staining 

 ones occurred near the basement membrane. The basement 

 membrane itself differs markedly from that of all the other 

 species here described in that it is of great thickness, and 

 almost unaffected by staining reagents (fig. 24, bm.). Both 

 circular and longitudinal muscle layers are present in the 

 cutis. The cutis glands are small, and stain deeply with 

 carmalum. The connective-tissue layer is well marked, 

 becoming very strong posteriorly. Its fibres are to a great 

 extent oblique. 



Of the muscle layers the outer longitudinal in the 

 oesophageal region is more than double the thickness of the 

 circular layer, which in its turn is thicker than the inner 

 longitudinal layer. The horizontal musculature over the 

 inouth is very feeble, and there is a trace of longitudinal 

 fibres between the alimentary canal and the proboscis sheath. 

 Circular fibres surround the cephalic lacunae, and a ventral 

 muscle-cross occurs (fig. 18). There is no diagonal layer. 



The vascular system presents no head loop. Instead 

 there is a network of lacuuEe separated by fibrillated tissue 

 containing- very large oval nuclei. The two lateral vessels 

 are not formed until the brain is reached. The dorsal vessel 

 does not leave the proboscis sheath until 1"2 cm, behind the 

 tip of the snout. 



The alimentary canal is of the usual type. The intes- 

 tinal diverticula commence about 2 cm. from the tip of the 

 snout. A ventral gutter is well marked. 



The proboscis is about 12 cm. long and very stout. 

 Two muscle-crosses are present (fig. 17, mcr.). The epi- 

 thelium is in part much thickened, and contains a number of 



