132 PHYLLAPLYSIA. 



truncated ; rhinophores tubular, slightly expanded toward their 

 apices, slit below. Foot rather broad, truncated in front, scarcely 

 differentiated from the integument of upper surface. Gill cavity 

 small, enclosed by two minute lobes ; mouth longitudinal, furnished 

 with two transverse, fleshy lateral processes (pi. 36, fig. 4). 



General ground-color not known, markings consisting of minute 

 irregular dots most numerous above. 



Shell (pi. 36, fig. 5) small, claw-shaped, long, thin, glassy and 

 pellucid, with iridescent reflections, sculptured with concentric 

 growth lines, the nucleus apical, sinus obsolete. 



Radula (pi. 36, fig. 6) seems to have teeth according to the form- 

 ula 301 "30. See above for description of teeth. 



Yokohama, Japan. 



Phyllaplysia punctulata T.-C., Zool. del Viaggio intorno al Globo 

 della R. Fregata Magenta, Malacologia, p. 112, pi. 2, f. 3 a, b, c 



(1874). 



Genus V. PHYLLAPLYSIA Fischer, 1872. 



Phyllaplysia FISCHER, Journ. de Conch., 1872, p. 297. MAZ- 

 ZARELLI, Boll. Soc. di Naturalisti in Napoli, vii, 1893, p. 5, pi. I 

 (anatomy). 



Body oblong-oval, much depressed and flattened ; eyes, anterior 

 tentacles and rhinophores as usual in the family, the latter much 

 nearer the anterior end than to the dorsal slit. Mouth with well- 

 developed labial palpi. Pleuropodial lobes arising behind the mid- 

 dle of the length, contiguous, the right overlying the left, united 

 behind, leaving a very short dorsal slit more or less open at the two 

 ends. Foot very broad. 



Shell wanting. Opaline gland diffuse. 



Radula (pi. 9, fig. 26) with the rhachidian tooth tricuspid, cusps 

 acute ; inner laterals with three broad, obtuse cusps, the middle one 

 largest ; passing outward on the radula the inner cusp increases in size, 

 and the outer cusp decreases and becomes obsolete. Mazzarelli 

 gives a somewhat different form of teeth (pi. 67, fig. 26). 



Distribution : Bassin d'Arcachon, southwestern France. 



Allied to Petalifera and especially to Notarchus, but the body is 

 more depressed, the shell wanting, if we may trust Fischer's account, 

 and the number of denticles of the teeth is less, the cusps of the 



