126 R. C. PUNNETT. 



to the brain. They are continued beyond the level where 

 the ciliated canal is given off. 



Frontal organ and eyes are both absent. 



Cerebratulus robustus^ n, sp. 



A single specimen only was procured. It is a short, thick 

 form 7 cm. long and about 7 mm. broad in the middle, with 

 a depth of about 4 mm. The snout is very blunted. The 

 mouth is small and the head slits rather short. No caudal 

 appendage could be observed, but this may have been due to 

 an accident. Unfortunately no record was made of the colour 

 in the living form. In the preserved specimen it is a uniform 

 pale huffish brown. 



The epithelium is separated by a fine line (possibly the 

 expression of a delicate membrane) into an outer portion con- 

 taining a few unicellular glands but no nuclei, and an inner 

 nuclear portion also containing unicellular glands (fig. 20, ep.). 



The cutis, which is separated from the epithelium by a 

 fine basement membrane, possesses a thin layer of circular 

 and longitudinal muscle fibres, contains a moderately well- 

 developed layer of glands. Beneath these, again, the connec- 

 tive-tissue layer is well marked in the oesophageal region, 

 being" thicker than the rest of the cutis. 



The muscular system is of the normal type. A diagonal 

 layer is present between the circular layer and the nervous 

 layer. 



The vascular system anteriorly forms a well-marked 

 head loop. The blood lacunae in the oesophageal region are 

 extremely small, and a single one is present in each of the 

 ventral oesophageal folds. There is no well-marked anasto- 

 mosis among them, as in most cases. Otherwise the arrange- 

 ment is typical. 



The alimentary canal in the oesophageal region (fig. 16) 

 presents a well-developed glandular layer beneath the epithe- 

 lium ventrally — recalling somewhat the condition found in 

 the Eupoliidge. The intestine commences about 1"3 cm. fi'om 

 the anterior end, 



