116 Froceedinf/t; of the Royal Society of Victoria. 



no definite observations to record, and can only suggest that 

 they are developed from the granular raesoderinal cells (Fig. 

 24, gv. c.) which are very abundant in the neighbourhood of 

 the reproductive organs. 



5. Summary. 



On comparing the foregoing account of the minute 

 anatomy of Geonemertes australiensis with Biirger's already 

 often quoted researches on the marine Nemertea, and 

 especially the marine Euoijla, it will be seen that the 

 marine and terrestrial forms agree very closely in structure. 

 The most striking and important difference concerns the 

 excretory system, which, in Geoncmertes, consists of a 

 system of intra-cellular tubules terminating in flame-cells. 

 The circulatory system, moreover, appears to be merely a 

 specialised portion of the excretory S3^stem. 



Only four species of land Nemertines have hitherto been 

 described, viz.: — Gemieinertes jialaensis, Semper; G. ckali- 

 co'pkora, von Graff; Teirat^temma agricola, von Willemoes- 

 Suhm, and T. roderi camion, Gulliver. From all these 

 Geonemertes australiensis differs widely, the most strikirjg 

 difference being, perhaps, the large and indefinite number of 

 eyes. 



The principal characteristic features of Geonemertes aus- 

 traiiensis are as follows : — 



Animal about 40 mm. long and 25 nnn. broad when 

 crawling. Colour chiefly yellow, sometimes with a darker 

 median dorsal band of brown. Eyes numerous, about forty, 

 arranged in two main groups one on each side of the head. 

 Lateral organs well developed, opening on the ventral 

 surface of the head in front of the brain by small round 

 apertures sometimes (? always) placed in a transverse groove. 

 No rod-like bodies in the skin, but irregularly oval, cal- 

 careous bodies in the deeper tissues. Mouth opening into 

 the rhynchodseum. Sexes distinct. Cephalic gland well 

 deveIo])cd, but with no conspicuous external opening. 

 Excretory system consisting of branching intra-cellular 

 tubules, provided with flame-cells and connected with the 

 circulatory system. The remainder of the anatomy closely 

 resembles that of the marine Enopla. Found under logs 

 and stones in Australia. 



