124 R. C. PUNNliTT. 



duct on each side opening just over the level of the side stems 

 (fig. 37). 



The nervous system exhibits the usual type. The 

 median dorsal nerve is not greatly differentiated from the 

 nervous sheath enclosing the circular musculature. 



The cerebral organ is well developed, and is rounded in 

 shape though somewhat flattened dorso-ventrally. The 

 ventral glands are well developed, but dorsally they are 

 almost absent. The dorsal lobe of the dorsal ganglion ceases 

 before either the ciliated canal effects a junction with the 

 ventral lobe or the appearance of gland cells round the 

 former. 



A frontal organ of the typical threefold arrangement is 

 present at the tip of the snout. 



Eyes are absent. 



The head glands are well marked^ reaching ventrally 

 beyond the commencement of the brain. Both dorsally and 

 ventrally they merge into the cutis glands. 



Cerebratulus brunueus, n. sp. 



'I'he single specimen procured measured about 12 cm. in 

 length and 4 mm. at its greatest breadth. In shape it was 

 rounded anteriorly, though somewhat flattened posteriorly. 

 The snout was much blunted. The mouth was small and 

 rounded. A caudal appendage was present. The colour was 

 darkish chocolate in life, slightly paler ventrally. It persisted 

 to a great extent after preservation. 



The epithelium is very thick, and near the basement 

 membrane are a number of deeply staining, small, unicellular 

 glands. The circular muscle layer of the cutis is thin, and 

 beneath it is a comparatively thick though sparse layer of 

 longitudinal fibres (fig. 40, mJc). The cutis glands form a 

 compact, thick, and continuous layer, beneath which may be 

 seen traces of the connective-tissue layer which is almost 

 absent in this species. 



The muscle layers are strong, the outer longitudinal layer 



