BY C. HEDLEY. 45 



The cap-like mantle, to which the generic name alludes, covering 

 the whole of the visceral hnmp gives this odd creature somewhat 

 the aspect of an Onchidella ; on either side the margin adheres 

 to the body, but before and behind the free edge descends like 

 a curtain, from beneath which the tail alone protrudes ; along 

 each side runs an irregular black zig-zag stripe, while the ground 

 colour is like the tail a dull brown ; under a high power it is 

 seen to be finely papillated and transversely wrinkled ; except 

 the sinus at the pulmonary orifice no lobes or cicatrices as of lobes 

 coalesced together are apparent. I found no trace of a shell. In 

 both specimens dissected the stomach was quite empty. Jaw 

 arcuated, rather narrow, excessively thin and fragile ; upper 

 margin entire, concave edge divided into a dozen irregular teeth 

 which show a tendency to split into minor denticules ; no 

 rostrum or central limb. The jaw exhibits no raised ribs or stout 

 denticules after the Helix pattern, but rather appears as if an 

 originally smooth jaw were irregularly crumpled and frayed. The 

 teeth of the radula are extremely small, and seem from the unusual 

 length of the basal plate to be arranged in distant rows ; the rows 

 are nearly straight; some 45 ranks from the rachidian they sweep up 

 into a shallow curve and then flatten out again. I have some 

 doubts whether I interpreted the rachidian aright ; it appeared to 

 be broadly reflected, cordate in outline, tapering to an acuminate 

 point, with traces of lateral cusps. The laterals are remarkable 

 for their long narrow basal plates, twice the length of their 

 reflections, which are straight, slender and tapering. In the plane 

 of the membrane the teeth are straight, but vertically they curve 

 almost into a hook, A proximal accessory cusp appears a few 

 removes from the rachidian, further away a distal cusp is also added ; 

 as the accessory cusps are unsymmetrical, and being in different 

 planes cannot be focussed at once, they are somewhat difficult 

 to observe. The genital system appears much contorted at its 

 orifice, after which it divides into three portions ; the duct of the 

 genital bladder, which is rather short, twisted and continuing after 

 reaching the genital bladder is again expanded into a second sac ; 

 the penis sac stout and pyriform, invaginated upon itself and 



