24 Mr. FT. M. Bernard on th<' Origin of the 



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



A transparent shinini^ little species, with regularly costu- 

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

 driforni 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 tuoth. 



Two sjiecimens, one of which is slightly more elongate 

 than the other. 



EXPLANATION OF PLATE III. 



Fig. 8. Pupa jxretorieTisia. 



Fig. 0. yriquuUindica. 



Fig. 10. Ennea distinda. 



Fig. 11. reyularis. 



Fig. 12. perspicua, 



Fiy. 13. Collieri. 



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

 ISttiparous Glands. By IIenry M. Beknakd, M.A. 

 Cantab, (from the Huxley Research Laboratory). 



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

 brought forward some evidence in favour of the derivation of 

 the Arthropodan trachea? from sctiparous glands, and pointed 

 out how this derivation might be made to explain many of 

 the difliculties 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 tracheai from the notojjodial acicular glands, 

 the .'^tink-gland.s mIhcIi occur dorsally to the stigmata might 

 be the jilands of the original parapodial setaj. Mr. Pocock, 

 of the Briti^^h ^luseuni, kindly informs me that in the Clior- 

 deumidai, which ajjpear in many respects to be intermediate 

 forms between the lulida3 and the Polydesmida?, the foramina 

 re]jUgnatoria of these latter are not to be found, but setaj 

 develop apparently exactly on the sjjot where these glands 

 ougiit to occur, and, further, that in the Polyxenidie a great 

 tutt of i^etai grows in the same spot, apparently in place of 

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

 important fact, that in Scolopendrelluj in which animal the 



