582 



F. A. Potts, 



Fig. D. 



Transverse sectiou through 



visceral raass jiist in front 



of the bay. Abbreviations 



as iu precediüg figures. 



Fig. E. Transverse sectiou through peduncle. 



Fig. F. 



a Strand of tissue which contains a wide and definite lacuna (Fig-. E). 

 This does not, however, pass straiglit to the visceral mass but runs 

 posteriorly for a considerable distance in the Upper surface of the 

 mantle (Fig. F) at the same time shifting slightly toward the left side. 

 But at the point where the section drawn in Fig. G is taken tliere 

 is a projection of the peduncular tissue which soon fuses vvith the 



