495 
Succinea ovalis optima Pilsbry. Pl. XXV, Fig. 18-20. 
Station V. The large form so abundant in Station V, appears to 
be Pilsbry’s optima, the large individuals of which are quite character- 
istic; the smaller specimens approach very closely to typical ovalis, 
having the peculiar greenish color. Specimens from this region would 
seem to indicate that optima is the senile stage of ovalis. 
SIGMURETHRA. 
Superfamily AULACOPODA. 
Family PHILOMYCIDA. 
Genus PuiLomycus (Rafinesque) Ferussac. 
Philomycus carolinensis (Bosc.). Moll. Chi. Area, Pl. XXX, Fig. 1. 
Station XXX. 
Family ENDODONTID. 
Subfamily ENDODONTIN&. 
Genus Pyramiputa Fitzinger. 
Subgenus Patula Haldeman. 
Pyramidula aliernata (Say). Moll. Chi. Area, Pl. XXVIII, Fig. 23-24. 
Stations V, Vill, XXVIIL- 
Genus Heticopiscus Morse. 
FHlelacodiscus parallelus (Say). Moll. Chi. Area, Pl. XXVIII, Fig. 25. 
Stauions xox VLE. XXX. 
Family LIMACID. 
Genus AGRIOLIMAX MOrch. 
Agriolimax campestris (Say). Moll. Chi. Area, Pl. XXVIII, Fig. 13. 
Stations Il, VIE, IX; XVIID, XIX, XXIV, XXVIII, XXXIV. 
Family ZONITID. 
Subfamily ARIOPHANTIN. 
Genus ZONITOIDES Lehmann. 
Zonttoides arboreus (Say). Moll. Chi. Area, Pl. XXVIII, Fig. 9. 
stations Vi VIE, XIX, XXIV, XXVIIT, XXX, XXXIV. 
