250 SELECTED NOTES FEOM 



In preparing feet with potash, the soft part, b (see plate), is very 

 Fig. 28. liable to be dissolved 



■^ away. The soft part 



of the pad is support- 

 •\ ed by a stiff concave 

 --^ rib, c, to which the 

 muscles are probably 

 ^^ attached, and the pad 



can be partially retracted into a socket, as in the annexed diagram 

 (Fig. 28) in which a represents the stiff part ; b^ the soft part; and 

 c, the socket. There is a dark spot, e (see Fig. 4 in plate), near the 

 part where the claws and pad are joined, which, I think, must be 

 due to a thickening of the chitinous integument for the purpose of 

 strength, because this part must necessarily be strong. The slide 

 from which this drawing was made, not having been treated with 

 potash, has retained in a great degree its natural form and colour, 

 although in mounting, the pads a a have come round to the side 

 from underneath, through the twisting of the joints to which they 

 are attached. But if they had not twisted, they would have been 

 invisible. 



F. J. Allen. 



Palate of Doris.— This fine Palate [Odontophore, Ed.] is ob- 

 tained from one of the Nudibranchiata, the popular name of 

 which is "Sea-Lemon," and here (as in the case of Sea-Cucumber) 

 the resemblance is strikingly suggestive. The Sea-Hare [Aplysia) 

 is a synonym equally applicable to one of the Tecti branch iata. 

 Some fine Nudibranchs are to be seen at the Crystal Palace 

 Aquarium, and probably also at Brighton, but they may be easily 

 overlooked, owing to their peculiar shapes, even when two inches 

 in length. There are some good figures of these in Gosse's 

 " Mollusca " and in Carpenter's " Zoology." The palates oi ^olis 

 are exceedingly beautiful, especially with the polariscope. 



H. E. Freeman. 



Palate of Cyclostoma elegans.— This is a land Snail, which 

 burrows underground. It may sometimes be found (alive) by 

 digging on limestone hills, but even in places where I have picked 

 up the empty shells three and four at a time, I have searched in 

 vain for a living animal. The colour of the shell is grey, it is 

 slightly mottled, and the shell is striated in the direction of the 

 spiral. It has an operculum, and is nearly allied to the common 

 Faludince, and Bithynia, of our ditches. 



H. M. J. Underhill. 



