A STR.fi A CEA . IL YA NTHID.fi. 



THE WAVED MUZZLET. 



Peacliia undata. 



Plate VIII. Fig. 4. 



Specific Character. Column cylindrical, short ; conchula cut into five 

 shallow lobes ; tentacles crossed by dark wavy bands. 



Peacliia undata. Gosse, Annals N. H. Ser. 3. i. 418. 



GENERAL DESCRIPTION. 



Form. 



Column. Cylindrical, rounded below, slightly fluted, about twice as 

 long as the diameter of the disk ; terminating below in a central perforate 

 depression, around which the skin is much puckered, and minutely cor- 

 rugated. Surface wrinkled, both transversely and longitudinally, espe- 

 cially when contracted. Margin distinctly angular, sometimes forming a 

 very low parapet. 



Dish. Smooth, flat, or rising with an even and very gentle elevation 

 from the foot of the tentacles to the edge of the mouth ; marked with 

 twelve radii forming so many fine lines. 



Tentacles. Twelve, in one circle, marginal ; thick and rounded at foot, 

 tapering regularly to the tip, which is obtusely pointed ; transverse 

 section sub-ovate, the diameter from side to side exceeding that from back 

 to front. By irregular contraction, they sometimes become slender and 

 cylindrical, often with the tip clubbed or knobbed. They are generally 

 carried widely expanded horizontally, with the tips arching downwards, 

 like a twelve-rayed star. 



Mouth. Descends abruptly from the disk 

 with a sharp angle, but which can scarcely 

 be called a lip, as it is not thickened. It 

 is protrusile at the will of the animal, when 

 ordinarily it embraces the exserted gonidial 

 groove, and displays a number of plicae at 

 its edge. 



Conchula. The groove is greatly de- 

 veloped ; its edges are in contact until coxchula of p. undata. 

 about one-sixth of an inch from the tip, {magnified). 



where they separate, and turn over with a scroll-like expansion, the margin 

 of which is cut into five shallow teeth, as follows : — one terminal and two 



