XI V ANATOMY OF ACHATINID^B. 



(fig. 70). The whole penis is enveloped in a thin sheath. 

 The vas deferen is free from the vagina. The duct of the 

 spermatheca is rather long. The penis retractor is short, and 

 attached distally to the diaphragm near its right border. 



The kidney is of the usual oblong shape, more than double 

 the length of the pericardium. 



The jaw is irregularly and very strongly striated vertically. 

 The radula has 54,1,54 teeth in the widest part (p. ix, fig. 3). 

 Middle tooth subobsolete, without cusp, and with ill-defined 

 basal-plate. Inner pair of laterals with boss-like entocones, 

 which however have not well developed cutting points. The 

 ectocones are well developed on all of the teeth, and even on 

 the marginals the mesocone is simple, not emarginate as in 

 Achatina. 



This species differs notably from other species of Achatina 

 and Cochlitoma by the insertion of its penis retractor muscle 

 on the diaphragm. 



ARCHACHATINA (this vol., p. 104) . A. marginata has been 

 dissected by Semper, who reports a single long cervical lobe 

 on the left side of mantle. The flattening of the tail above 

 has dentate borders. Grenitalia as in granulata. Jaw with 

 very numerous narrow riblets, not denticulating the cutting 

 edge. Teeth 90 to 92 in a transverse row. Mesocone of the 

 central fully half as long as the basal plate, even-edged and 

 acute; first 5 laterals unicuspid; on the 6th a minute ecto- 

 cone appears, increasing to the 14th, and then diminishing, 

 together with the mesocone, which becomes blunter and wider. 

 A. d'Ailly has figured the teeth of A. marginata, showing at 

 least 12 unicuspid laterals (p. ix, fig. 1). 



The anatomy of A. bicarinata has been figured by Deshayes 

 in Ferussac's Histoire. I reproduce a portion of his figure, 

 pi. 63, fig. 29. The very large penis is partially enveloped 

 by a sheath, which is penetrated by the vas def erens as usual. 

 The distal insertion of the retractor is unknown. The duct 

 of the spermatheca is long. The uterus contains three very 

 large eggs. The well-developed cusp of the middle teeth and 

 the unicuspid inner laterals are features unlike Achatina. 



COLUMNA (this vol., p. 120). Soft anatomy unknown. 



