380 EXPLANATION OF THE PLATES. 



TAB. IV. 



1. Anelasma squalicola, (copied from Loven.) The 



ovigerous lamellae are seen 

 within the edges of the aperture 

 of the capitulum. Enlarged 

 about one and a half times. 



2. „ „ (from Loven), with the mem- 



branes removed from one side 

 of the capitulum and of the 

 peduncle, exhibiting the body. 



(a.) External membrane of 

 the capitulum. 



(a, a.) Inner membrane of 

 ditto, lining the sack, and 

 separated from the exter- 

 nal membrane by a double 

 fold of corium. 



ib.) The ovigerous lamellae, 

 the edge projecting beyond 

 the orifice of the capitulum. 



(c.) Penis, succeeded by six 

 pairs of rudimentary cirri. 



(d.) Probosciformed mouth. 



{e.) Orifice of the acoustic (?) 

 sack. 



(/.) Ovigerous frgenum. 



(c/.) Ovarian branching tubes 

 filling up the peduncle. 



(k.) Outer integument of pe- 

 duncle, lined by corium 

 and muscles, continuous 

 with the outer membrane 

 (a) of the capitulum. 



3. ,, „ Small portion of the outer integu- 



ment of the peduncle, greatly 

 magnified, exhibiting the natural 

 lines of splitting, and showing 



