24 Mr. H. M. Bernard on the Origin of the 



Hah. Pretoria. In coll. Edward Collier, Esq. 



A transparent shining little species, with regularly costu- 

 late whorls, ventricose, seven in number ; the shell is cylin- 

 driform in shape; peristome shining- white, somewhat trans- 

 lucent, as is the rest of the shell, furnished with a promi- 

 nent acute parietal fold and an internal broad plica behind the 

 columellar margin of the peristome. There is also one simple 

 labial tooth. 



Two specimens, one of which is slightly more elongate 

 than the other. 



EXPLANATION OF PLATE III. 



Fig. 1. Helix strobilodes. 



Fig. 2. somersetensis. 



Fig. 3. Piqm tabularis. 



Fig. 4. dysoruta. 



Fig. 5. (juantula. 



Fig. 6. Sykesii. 



Fig, 7. kapha. 



Fig. 8. Pupa p-etoriensis. 



Fig. 9. griqualandica. 



Fig. 10. Ennea distincta. 



Fig. IL regularis. 



Fig. 12. perspicua. 



Fig. 13. Collie ri. 



III. — Additional Notes on the Origin of the Trachece from 

 Setiparous Glands. By Henry M. Beknard, SI.A. 

 Cantab, (from the Huxley Eesearch Laboratory). 



In the last issue of the ' Zoologische Jahrbiicher ' (Bd. v.) I 

 brought forward some evidence in favour of the derivation of 

 the Arthropodan tracheas from setiparous glands, and pointed 

 out how this derivation might be made to explain many of 

 the difficulties which at present beset this subject. I propose 

 here to bring forward a few more arguments tending in the 

 same direction. 



(1) I endeavoured to show that in the Myriapoda, while we 

 could deduce the trachose from the notopodial acicular glands, 

 the stink-glands which occur dorsally to the stigm"Uta might 

 be the glands of the original parapodial setee. Mr. Pocock, 

 of the British Museum, kindly informs me that in the Chor- 

 deumidai, which appear in many respects to be intermediate 

 forms between the lulidse and the Polydesmidse, the foramina 

 repugnatoria of these latter are not to be found, but setse 

 develop apparently exactly on the spot where these glands 

 ought to occur, and, further, that in the Polyxenidaj a great 

 tuft of seta3 grows in the same spot, apparently in place of 

 the stink-glands which are wanting, and, again, a still more 

 important fact, that in Scolopendrella^ in which animal the 



