24 BULLETIN OF THE 



Genital system complicated with accessory organs in the form of vaginal 

 prostates, one long, narrow, flagellate, tapering at apex, four short, cylindri- 

 cal, bluntly terminating. Genital bladder very large, oval, on a narrow duct. 

 Penis sac stout, tapering above into a flagellate extension, at the commence- 

 ment of which the vas deferens enters. 



Jaw low, wide, ends attenuated, blunt : over twelve flat, broad, crowded ribs, 

 whose ends denticulate either margin. 



Lingual membrane with 40-1-40 teeth. Centrals tricuspid ; laterals bicus- 

 pid ; marginals also bicuspid without the inner cutting point being bifid. 



Turricula terrestris, CHEMN. 

 Tachea hortensis, MULL. 



Pomatia aspersa, MULL. 

 Also, San Jose, Cal. 



Besides the above, that have more or less firmly established themselves here, 

 various species have from time to time been noticed living, but the individual 

 or colony has died out. Some of these are : 



Zonites cultellatus See Vol. V. p. 135 



alliarius " "135 



Stenogyra octona " " 196 



Bulimulus obscurus " "212 



Pupa marginata " " 213 



Helix depicta " "256 



Pisana " "256 



arbustorum " "256 



lactea " "257 



variabilis " "257 



Bulimus acutus " "399 



Succinea putris " " 430 



amphibia " "430 



UNIVERSALLY DISTRIBUTED SPECIES. 



For all of these see Vol. V. 



Patula striatella, ANTHONY. Zonites arboreus, SAY. 



Microphysa pygmaea, DRAP.* indentatus, SAY.t 



Helicodiscus liiieatus, SAY. minusculus, BINN. 



Vallonia pulchella, MULL. viridulus, MKE. 



Pupa muscorum, LIN. milium, MORSE. 



Zonites nitidus, MULL. fulvus, DRAP. 



* See below, page 35. 



t See Supplement I. for Zonites subrupicola. 



