262 



MR. G. C. ROBSON ON THE 



Pallial Ganglia, ete.— The cerebro-pallial connectives join the 

 pallial ganglia in exactly the same position in the two varieties, and 

 in this area the arrangement is very similar to that of var. ohesa. 

 There appears to be no visible distinction between the pallial, 

 visceral, and abdominal ganglia. There is the same asymmetry 

 with regai-d to the pallial roots, there being three on the left 

 and only one on the right. This asymmetry was observed by 

 Amaudrut in A. panthera (1886). The three main abdominal 

 nerves came off a common root in f^. 



Text-figure 9, 



spt/. 



Coclilitoma sehra XAY.fidgurata. 



Genitalia. 



hd. = heimaphrodite duct. spv. = spennoviduct. spth. = spermatlieca. 



vd. = vas deferens. _^r. = penis retractor, p. = penis. 



(5) Reproductive System. 

 The gonad lies between the second and third whorls. The 

 hermaphrodite duct, spermoviduct, and albumen gland show no 

 difference from those of ohesa. The vagina is long, measuring 

 27 in f and 34 mm. in f^. The spermatheca is spatulate in both 

 examples and the duct is long (38±2 in f^ and 35±2 mm. in f^). 

 The vas deferens measures 56 ±2 mm. in f^ and 41 ±2 mm. m f,, 

 and therefore may be regarded as long, though the anomalous 



