1880.] FERUSSACIA GRONOVIANA. 663 



for so thin and fragile a form, possesses considerable powers of 

 vitality, as a large number of them packed together in a corked tube 

 had survived for many weeks. It may be that, being carnivorous, 

 they had been living on their less fortunate companions. 



The animal (PI. LXIV. fig. 1) is of a fine bright sea-green colour : 

 the eye-tentacles are dark and thick at their bases, which are conti- 

 guous ; the oral very short and blunt ; muzzle retractile, and can be 

 produced considerably. It is of darker tint at the extremity of the 

 foot, which has a distinct mucous gland with a truncate lobe above it. 

 There is a well-marked pedal line parallel to the edge of the foot, 

 from which a series of regular transverse furrows extends to the 

 dorsal side ; but the intervals between these furrows are smooth, not 

 papillate : this is seen to extend to the muzzle ; but from the oral ten- 

 tacles the whole upper part of the neck is strongly and longitudi- 

 nally grooved. The animal when fully extended is long and narrow, 

 end of foot equal with apex of shell when moving; and the mantle 

 is all round slightly reflected over the thin margin of the peristome. 

 The right dorsal lobe is small, the left is larger (fig. 2). 



The odontophore (figs. 8, 8 a) consists of over a hundred rows of 

 teeth, about 60 in each row, with a very considerable difference in 

 the size of the centrals and laterals, the centre being very small, 

 bluntly tricuspid, on an elongate oblate base ; the next seven having 

 a long pointed central tooth with the two smaller on either side ; the 

 outer laterals are minutely evenly tricuspid on broad, oblong, rect- 

 angular bases. The dental formula is 22—7 — 1— /— 22. The jaw 

 (figs. 4, 4 «, 4 b) is peculiar, not hard and chitinous as is usually the 

 case, but thin and elastic, consisting of a thin membranous ribbon, 

 closely ribbed or rather folded longitudinally, and presenting on the 

 anterior side a zigzag or serrated edge. This elastic plicate structure 

 of the jaw is thus quite in accord and adapted most admirably to 

 the retractile muzzle of the animal. The buccal mass is well de- 

 veloped, of rounded form ; the salivary ducts short, the glands of 

 unequal size. 



Generative oiyans.— The penis (fig. /) is short, fusiform, conical 

 near the junction of the vas deferens ; the retractor muscle is given 

 oflF close to this. The spermotheca is elongately pear-shaped. No 

 dart-sac was observed in the three specimens examined. The ovo- 

 testes (fig. 5) in one specimen appeared to be a mass of globosely 

 pear-shaped follicles united at their basal ends into a duct ; but in 

 two specimens (fig. 6) there was found near the apex, embedded in 

 the livers, a dark triangular-shaped organ, which, when examined more 

 closely, was hilobed, uniting in a single duct, streaked and coloured 

 black along its straight terminal margin, and may possibly have con- 

 sisted of closely packed bundles of spermatozoa. 'The hermaphrodite 

 duct was not made out, nor the albumen-gland ; and I most unac- 

 countably did not notice the exact position, with respect to the right 

 eye-tentacle, of the generative aperture. 



This species in many respects assimilates to Agraulina, Bourg. 

 {Lovea tornatellina, Lowe), of Madeira, described and figured by the 

 Rev. R. Boog Watson (together with Lovece melamjioides, triticea, 



