DescriptioDS of new Metanemerteans. g 



does not remain below the rhynchocoel, but passes to the right of it 

 (Fig. 27 B.D). All these evaginations are very thin-walled, in cora- 

 parison with the rliynchocoel, their musculature consistiug (without) 

 of a Single layer of circular, and (within) of a Single layer of longi- 

 tudinal muscle fibres. There is no outer mantle of parenehyra cells 

 encircling them , as is present around the rhynchocoel. The only 

 other Nemertean with rhyuchocoelic diverticula is Drepanophorus, as 

 described by Hubrecht and Bürger; but in that genus the diverti- 

 cula are paired, do not arise from the ventral side of the rhyncho- 

 coel, and are more numerous. 



The proboscis and its armature is as in ÄmpMporus : the stilet 

 basis (Fig. 20) is rounded posteriorly, without medial constriction 

 there are two lateral stilet pockets. Longitudinal nerves of the pro- 

 boscis, 11 in number. 



No sensory hairs in the body epithelium. 



The longitudinal musculature of the body wall is ventrally about 

 twice as thick as the body epithelium; dorsally it is about one half 

 as thick as ventrally. 



The dorsal blood vessel is very small in diameter (Fig. 27), as 

 are the lateral vessels; in no other Metanemertean which I have 

 examined, are they of such small diameter. 



Short nephridia, of the ÄmpMporus type, present in the cerebral 

 region. 



Body cavity large, containing mesenchym cells. 



The cephalic gland extends posteriorly to the brain. 



Dioecish. The only individual which I found of this species was 

 a female, with numerous ovaries, the latter extending on each side 

 from the ventral median line dorsally to the side of the rhynchocoel, 

 so that on a given"; frontal section there were as many as 8 ova on 

 each side (a Single ovum matures in each ovary). 



The length of the Single individual which I found was about 

 20 mm. The head scarcely wider than the body, rounded terminally. 

 Width of the body about 2 to 3 mm when fully extended, largest 

 posteriorly, not flattened. Contracts to about V4 its extended length, 

 as an ÄmpMporus. Color, deep yellowish-brown, becoming orange 

 anteriorly. 



Ocelli (Fig. 12) medium sized, arranged in two groups on each 

 side of the head, 17 ocelli on the right, 19 on the left. The anterior 

 group of each side forms a Single curved line, the anterior ocelli ot 

 which foUow the lateral margin of the head, while the posterior 4 



