PATELLID. Bolt 
Leprra, Gray. 
Syn.—Cryptobranchia, Midd. pars. Propilidium, Gray, not 
Forbes and Hanley.  Pilidium, Stimpson, not F. and H. nor 
Midd. 
Shell conical, patelliform, with a subspiral nucleus, which is 
generally lost in early life, the permanent apex being erect or 
anteriorly directed. 
Animal without eyes, without lateral teeth, with a rachidian 
tooth, and erect uncini; muzzle with an entire margin, which is 
extended backward into a tentacle-like filament on each side. 
LEPETA (restricted), Dall. Apex erect. Rachidian tooth tri- 
cuspid, the middle cusp much larger ; lateral teeth simply cuspi- 
date. LZ. ceca, Mill. (Ixxxiv, 42 . 
CRYPTOBRANCHTA (restricted), Dall. Apex inclined anteriorly. 
Rachidian tooth with three nearly equal denticles; uncini 
broadly hooked. L. concentrica, Midd. (Ixxxiv, 43). 
LEPETELLA, Verrill. Shell as in Lepeta, Animal differing in 
having eyes and in being provided with true lateral teeth and 
also with seale-shaped uncini. JL. tubicola, Verrill. 200 to 400 
fms., off New England coast. 
piniptumM, Forbes. (lotha, Gray. Ergina, Jeffreys.) Shell 
patelliform, apex anterior, generally deep-colored. Mantle 
fringed with cilia; rachidian tooth long, rhomboidal, bearing a 
very large black cusp with asimple denticle on each side, laterals 
with broad cusps striated beneath and obliquely bent, shafts 
slender. P. fulvum, Forbes. Northern America and European 
coasts. 
Supramity ACM AINE. 
Embryonic shell conical. Animal usually having eyes and 
a plumose, cervical, external gill, with or without a marginal 
cordon; rachidian tooth rarely present, lateral teeth three in 
number. ; 
AcmA, Esch. 
Syn.—Tectura, Aud. Patelloida, Quoy and Gaim. Lottia, 
Gray. Iotha, Forbes. — Patelloidea, Couth. Tectura, Gray. 
Secutellina, Gray. Scutella, Brod. 
Distr.—25 sp. Mostly W. Coast of N. America, Europe, ete. 
A. mitra, Esch. (Ixxxiv, 44). 
Shell solid, patelliform; apex erect or anteriorly inclined. 
Animal. Muzzle frilled, produced at the lower anterior corners 
into two lappets or tubercles; no marginal cordon, the cervical 
gill alone present. 
COLLISELLA, Dall. Muzzle-frill simple, entire, not produced 
into lappets or tubercles. A. spectrum, Reeve (Ixxxiv, 45, 46). 
A, variabilis, Sowb. (Ixxxiv, 47). 
