422 J- T. Cunningham 



The second form mentioned varies in color from yellowisli brown to light 

 reddish brown , sometimes having ligliter colored spots ; it has streng 

 powers of contraction ; its lateral lobes are fused together posteriorly 

 to the level of the mantle-siphon and are difficult to separate ; its mantle 

 glands exude a white viscoiis fluid, and its poison glands open by many 

 openings grouped over an elliptical area behind the genital opening. In 

 these characters it agrees with the A. leporina, Cuvierana and Poliana 

 of Delle Chiaje ; but it is best to retain for it the name A. depilans L. 

 with Dr. Blochmann. The third form I have not used for my prepa- 

 rations ; it exudes a purple fluid and has the opening of the poison glands 

 as in A. depilans: Dr. Blochmann calls it A. punctata. The first form 

 has no opening in the duplicature of the mantle which Covers the shell ; 

 the other two have a circular opening in the centre of the shell- co vering 

 of considerable size. Both A. camelus and A. depilans have a somewhat 

 streng characteristic smeli which is strenger in the latter. 



In erder to see the kidney, which is the triangulär gland of Delle 

 Chiaje, the lateral lobes of ene of the larger forms are separated or cut 

 away ; the cevering of the shell is then remeved with the scissers and 

 the shell taken away, then in the area which was covered by the shell, 

 are seen the pericardium anteriorly and the surface of the kidney ; the 

 latter is of a light yellow coler and its front edge runs along the posterior 

 border of the pericardium, from which it extends backwards growing 

 narrewer towards its posterior rounded termination in the left corner of 

 the area covered by the shell. To the right of the kidney is the free 

 mantle fold which forms the roef of the gill-cavity. The shell extends 

 nearly but not quite to the edge of this fold. To the left the upper surface 

 of the kidney extends beneath the skin, which lies between the shell 

 area and the left lateral lobe er epipodium, for seme distance. When the 

 pericardium is cut open, the anterior face of the kidney is seen forming 

 the posterior wall of the pericardium, and at the lewer edge of this face 

 to the right close, to the auricle is seen the depression leading to the 

 canal which forms the communication between the pericardium and the 

 cavity of the kidney. The relations now described are seen in fig. 1 , 

 which represents a view of the dorsal surface of A. depilans: the epi- 

 podia have been cut away aleng the line ep ; the shell has been taken 

 out from its Chamber and part of the mantle fold which covered the shell 

 is seen turned aside at mf: the pericardium is laid open and the posi- 

 tion of the reno-pericardial opening is seen at sp. The floor of the shell 

 Chamber is formed on the left by the upper surface of the kidney [k^ fig. 1) 

 and on the right by the free part of the mantle which forms a thin trans- 



