PHYLLAPLYSIA. B38: 
laterals broad and blunt. The position of the genital pore is not 
given by Fischer. 
In habits Phyllaplysia is like Petalifera and Notarchus, living on 
Zostera and other sea-weeds upon which they feed, clinging with 
limpet-like tenacity to the supporting surface, and mating recipro- 
cally like the land snails. 
P. paFontTI Fischer. PI. 36, figs. 1, 2; pl. 9, fig. 26. 
Length 15-35 mill. Body very much flattened, rounded in front, 
obtuse behind; head and neck short. Anterior tentacles wide, flat- 
tened, confluent at base, hollow, slit in front, truncated at the apices ; 
rhinophores hollow, dilated at the ends, slit; the eyes in front of 
them. Branchial slit small, covered by small lobes; foot very 
wide, subtruncate in front ; buccal processes conic and transverse. 
Color pale green above, ornamented with concentric zones of a 
darker green, and small scattered spots formed of a rounded white 
dot surrounded by violaceous punctation, these spots appearing also 
on the anterior tentacles and becoming tubercular there ; upper 
tentacles pale green, with 4 or 5 rings of pale violet. Foot very 
light greenish-white; buccal processes white and transparent. 
Shell wanting. 
Basin of Arcachon, s. w. France, on sea- weeds. 
Dolabrifera lafonti Fischer, Ann. Se. Nat. (5), xiii, 1870, p. 3 (no 
description ).——Phyllaplysia lafonti Fiscuer, Journal de Conchyl., 
1872, p. 297, pl. 15, f. 1-3; Actes Soc. Linn. Bord., xxix, 1873, p. 
236.—-CRrossE, Journ. de Conch., 1875, p. 101. 
This species lives on Zostera, which it resembles in color. They 
adhere strongly by the large foot, and crawl rapidly like Limaces ; 
sometimes they float foot upward at the surface, in the manner of 
Limneidex. They cannot, of course, swim like Aplysias. | Copula- 
tion is reciprocal, as in the Helices, two individuals placing them- 
selves side by side, the head of one toward the tail of the other. 
They have been found only in the locality named and during the 
month of September. 
Crosse collected a specimen 35 mill. long, 9 broad, in which the 
concentric zones and the spots were less conspicuous than in the 
types, the general color being a more vivid green. ‘The animal, as 
observed by him in an aquarium, is habitually longer than shown in 
Fischer’s figure, especially when in motion. The dorsal bands are 
more numerous and less distinctly concentric than shown in the 
