420 • G. WYNHOFF. 



snout. It was supposed to belong to the same species as the individual 

 described as Micrura aurantiaca and a small specimen of Cerebratulus 

 roseus. From both, however, it differs in the shape of the head, which 

 is conspicuously swollen at its hinder part and not separated from the 

 body, so that it is best described as fig- or pear-like. The colour is 

 a greyish brown anteriorly, which is replaced by a yellowish grey in the 

 greater part of the body. These two colours are sharply separated 

 from each other, just as in Tntulanus jwh/moi'phus. Sections revealed 

 the following peculiarities, which made me create a new species for this 

 single individual. 



The cephalic slits are rather long, extending nearly to the beginning 

 of the mouth, and farther than the cerebral organs themselves. They 

 are not very deep, and reach only half-way to the brain. The cerebral 

 pit, however, is deeper. The cerebral canal originates behind the 

 dorsal brain lobe ; this bifurcates into two lobes, the dorsal of which 

 ends quite free in the longitudinal musculature in the region of the 

 cerebral canal, separated from the ventral lobe by a thick band of tissue. 

 The ventral lobe continues directly as the cerebral organ. This is 

 never in contact with any blood-vessel, but lies internally to the 

 circular muscle layer. The dorsal lobe of the dorsal brain, the cerebral 

 organ, and the ventral brain lobe are situated above each other. The 

 blood-vessels form one large dorsal anastomose in the head ; the very 

 short cephalic blood-vessels unite again within the brain ; from this 

 ventral anastomose an unpaired oesophageal blood-vessel takes its 

 origin. This unpaired vessel divides into two in the region of the 

 oesophageal nerve commissure. These two communicate often with 

 the lateral blood-vessels situated on both sides of the proboscis sheath. 

 In this region large gland cells are also conspicuous. They are buccal 

 glands, which are enormously developed all round the mouth and the 

 oesophagus. They are placed in clusters, and freely protrude into the 

 blood-vessels, both into the lateral and into the oesophageal vessels, 

 which frequently communicate with each other and form a network all 

 round the oesophagus. They are even more richly developed than in 

 Micrura alasJcensis, Coc ; they do not, however, extend outside the 

 circular musculature. 



The epithelium is not very thick. A separate cutis layer cannot be 

 distinguished. The cutis glands are situated in the outer longitudinal 

 muscle layer. A small layer of longitudinal muscle fibres, as thick as 

 the epithelium itself, and traversed by the gland ducts, separates the 

 layer of glands from the epithelium. These are themselves sur- 

 rounded by muscle fibres, and do not form a compact layer. They are 

 some two or three times as high as the epithelium. The bases of the 



