COLLECTION OF NEMEETEANS FROM SINGAPORE. 129 



commissure being, as usual, much thinner than the ventral. 

 The latter is found somewhat behind the former. The median 

 dorsal nerve is well marked. 



The cerebral organ is small. Both dorsal and ventral 

 glands are well developed. The dorsal lobe of the dorsal 

 ganglion (£g. Qa, ddg.) does not end until the glands of the 

 cerebral organ have made their appearance. 



The head slits are wide and shallow, not reaching more 

 than halfway to the brain. 



The frontal organ is exceedingly well developed, being 

 very conspicuous in sections through the snout. At the base 

 of each of its three divisions are a number of small cells, with 

 large nuclei, bearing a great resemblance to the ganglion cells 

 of the brain (gf.), though whether they are of such a nature 

 it is impossible to state definitely. A nervous connection be- 

 tween the frontal organ and the brain could not be traced. 



Eyes are not present. 



The head glands are well marked, falling anteriorly into 

 three divisions round the frontal organ. Po'steriorly these 

 merge into one surrounding the head loop. They take a 

 light stain with carmahim, and do not become continuous 

 with the cutis glands. Neither do they reach backwards as 

 far as the brain. 



Cerebratulus sordidus, n. sp. 



The shape is rather rounded anteriorly, more flattened be- 

 hind. The length is about 6 cm., but the tail was somewhat 

 damaged, for which reason it is not possible to say avIi ether a 

 caudal appendage was present. The head slits extend beyond 

 the mouth region as shallow depressions. The colour in life 

 was a dirty yellow-brown. 



The epithelium contains greenish unicellular glands 

 superficially, and small more deeply staining ones near the 

 basement membrane. The cutis presents a fine layer of 

 delicate longitudinal muscle-fibrils, but no circular ones. A 

 layer of composite lightly-staining cutis glands occurs (fig. 

 23, cgl.), beneath which there is a layer of connective tissue 



VOL. 44; FART 1. — NEW SERIES. I 



