COLLECTION OF NEMERTEANS PROM SINGAPORE. 127 



The proboscis is very thin and without muscle crosses. 



The proboscis sheath reaches nearly to the posterioi' 

 extremity of the animal. The rhynchodseum is very small. 



The generative sacs contain immature ova. 



The excretory system commences about 2*5 mm. from 

 the tip of the snout, and extends over about 5 mm. It lies 

 wholly ventral to the level of the side stems. There are no 

 excretory ducts opening to the exterior. Moreover, I have 

 been unable to discover any openings into the alimentary 

 canal, and as the series of sections was quite complete, I can 

 only conclude that in this instance the excretory system is 

 without any openings (cf. (7) Eupolia hemprichi). 



The nervous system is built on the usual type. The 

 upper lobes of the dorsal ganglion are considerably larger 

 than is general. The median dorsal nerve stands out well 

 from the nervous layer beneath the outer longitudinal muscle 

 layer. The ventral commissure is very strong, and where 

 they separate the ventral ganglion is nearly as large as the 

 dorsal. 



The cerebral organ is of moderate size and rounded in 

 shape, though posteriorly its outline becomes more oval (fig. 

 31, d). The dorsal gland cells are few, thovigh the ventral 

 are well developed. The organ is further removed from the 

 ventral nerve cord than is usually the case (fig. 31,6). The 

 dorsal lobe of the dorsal ganglion ends before the canal enters 

 the ventral lobe. 



The head slits reach nearly to the brain, but cease very 

 abruptly externally at the level of the anterior limits of the 

 brain. 



A frontal organ is present, but it is small. 



Eyes are absent. 



The head glands are well developed, and extend back- 

 wards nearly as far as the brain. 



Cerebratulus erythrus, n. sp. 



Several specimens of this worm were procured, the average 

 length being between 6 and 7 cm. The shape is rounded 



