170 



OS ANEITEA GRAEFFE1 AND ITS ALLIES. 



■Grooves arise at each lip, passing around the exterior base of each 

 tentacle, they gradually approach each other and enclose a triangu- 

 lar facial area equal in extent to the shield ; no sooner do these 

 grooves junction at the anterior angle of the shield, than they 

 abruptly diverge to encircle it. The groove on the left side bends 

 slightly outwards for two-thirds of its length, then it inwardly 

 inclines till it reaches the median line. The right side 

 groove turns sharply outwards and downwards till it readies 

 the pulmonary orifice, when abruptly turning it ascends to 

 the median line, there completing the third and posterior 

 angle of the mantle. The pulmonary orifice is capable of great 

 expansion, sometimes opening to a diameter of 8 mm., when all the 

 interior of the lung is visible A minute groove runs from the 

 pulmonary orifice to the anus. No definite mucus pore is visible, 

 but from the entire edge of the shield appears to issue abundance 

 of mucus. The mucus is transparent, the red stain that is some- 

 times rubbed off the marginal band must not be mistaken for it. 

 The inediaB groove is deep and well defined at its junction with the shield* 

 and grows fainter as it approaches the tail. On each side, about 

 twenty more or lpss^defined grooves run obliquely downwards, the 

 posterior dozen branch off from the median groove at an angle of 

 45 u . The space between the grooves varies from smooth to finely 

 obscurely reticulated. Tentacles wide apart, short, thick, conical. 



The calcareous fragments, which represent the shell of the 

 snail, are situated beneath the anterior end of the shield. They 

 consist of about a dozen, rounded, white pieces of irregular size and 

 shape. The anterior one is usually many times larger than all the 

 rest, and appears to consist of several morsels grown together* 

 This latter is fiat above, the thickened margins of the shell make 

 it somewhat concave beneath. One specimen measured 4 x 

 2 mm. | 



The lips are inconspicuous, and are immediately in front of the 

 jaw. The remarkable feature in this is its root or fang imbedded in 

 the roof of the buccal mass. It approximates more to the jaw of 

 the Cephalopoda than to the usual type of the Gasteropoda, The 

 cutting edge offers a slight median tooth, and on either side is 

 projected into frwo downwardly descending, inwardly incurving, 



