On Dimorphism in the Miliolinse. 401 



differs markedly from the Australian one, and conforms to 

 the more usual type amongst Land-Nemertines. 



The stylets and their arrangement closely resemble those 

 of G. australiensis ; in the specimen examined I have detected 

 four reserve-sacs. 



The sexes are probably distinct, for in the specimen of 

 which I cut sections I can find only eggs. 



Observations on a Variety o^ Peripatus novae-zealandise 

 with Sixteen Pairs of Legs. 



Having received from Mr. Suter three specimens of sup- 

 posed Peripatus novce-zealandice from Stratford, in the North 

 Island, I was greatly surprised to find on examination that all 

 of them had sixteen pairs of claw-bearing legs. I have care- 

 fully compared the specimens with the usual form (with 

 fifteen pairs of legs) obtained from both the North and South 

 Islands, and can find no other points of difference, the colo- 

 ration and the structure of the feet and jaws agreeing closely. 



It is well known that the number of legs in the Australa- 

 sian species of Peripatus is usually constant, although in some 

 other species it varies. I therefore think the three specimens 

 under consideration should be regarded as belonging to a 

 distinct local variety, for which I propose the name Peripatus 

 novce-zealandicB, var. SSuteri. 



It is interesting to note that the genital aperture in the new 

 variety is still between the legs of the last pair (the sixteenth) 

 and that the special nephridial apertures are on the legs of 

 the fourth and fifth pairs as usual. 



Christehureh, New Zealand, 

 September 1894 



LI. — Dimorphism in the Miliolinse and in other Forami- 

 nifera. By Prof. T. Rupert JONES, F.R.S., F.G.S. 



In 1826, when revising the work of previous authors, Alcide 

 D. d'Orbigny (Ann. Sci. Nat. vol. vii. pp. 297-304) placed 

 various forms which had been included by earlier observers in 

 the generic terms Mtliola, Miliolites, Serpula, Vermiculum. 

 and Lagena into six genera, which he called Biloculina, 

 Spiroloculina, Tri/oculina, Articulina, Qui?iqueloculina, and 

 AdeIosi?ia, concluding that the definite external segmentation 

 of the test was of real generic importance. 



In 1858 W. C. Williamson, in his 'Recent Foraminifera 

 of Great Britain ' (Ray Society), united three of these 



