538 



MKIMSTIC VARIATION. 



LI-ART I. 



C. Antenme. 



*828. Palinurus vulgaris : right antenna bore three complete 

 filaments. So tar as last spiny joint (merocerite) normal. Of 

 this joint the peripheral portion 

 much enlarged, presenting two 

 articulations The most posterior 

 bore a normal rarpoeerite and fila- 

 ment (Fig. 1!C, I). The anterior 

 articulation bore a double carpo- 

 cerite with two ti laments (II and 

 III). As author points out, II is 

 structurally a /<;// antenna. [By 

 the kindnes- ,,f M. Alphonse Milne 

 Kd wards I have been allowed to 

 examine thU specimen. I am not 

 -ure that I sue, -ceded in correctly 

 determining the surfaces of the 

 extra antennae, for the basal parts 

 were not very fully formed ; but 

 according to my determination 



their relations differed markedly 

 ,, ,.., ,."' FIG. 190. Proximal parts ot the right 



from those of any of the Schematic antenna of Palinurus ruiaaris, No. 828. 

 positions, for while the position I, the normal. II, extra left. Ill, extra 

 of origin is VVA the two extra right. (After Leger.) 

 antenna' stand very nearly in the Position DA.] LGER, Ann. 

 svi. nat., Znn/.. issi;', S. 7, i. p. 1UO, PI. (i. 

 *<S29. Astacus fluviatilis : exopodite of left 

 antenna! Fig. l!)7 )bear- t wo supernumerary 

 points, A'' and //, which seem to have been 

 insc-rieil upon the internal border of the 

 normal exopodite. STAMATI, G., Ball. Soc. 



/'i-'ince, ISSN, xin. p. 199, /r/. 



( \\SES. 



As has been stated, there are many cases, 

 recorded or preserved, in which the nature of 

 the parts cannot lie made out. The majority 

 of these are, I believe, injured or deformed 



limbs, ami not cases of repetition of parts. 

 \e\ert liel<\ss of the latter class there are un- 



-am 



s:;o. 



FIG. 1U7. Axtucu* Jlnria- 

 tilix having extra points to 

 'X(i]ioditc of left antenna. I?, 

 dOUbtedly some amorphous cases, though they normal right. L normal left, 

 are far less common than regular ones, even A", //, extra right and left. 

 as normal st nictures arc more common in their (After Stamati.) 

 regular shapes than in a deformed state. I mention the following as 

 bein.i:. I think, i he earliest record of abnormalities of this class. 



Homarus : left chela having irregular process on inner border of 

 dactylopodite, and two irregular processes on inner border of index. 

 [No description.] I'.KKMI \ i;nrs \ JJKKXIZ, Miscell. Curios., Jena, n. 

 1671, p. 17.">. Obs. 01. /'/. 



