FISSURELLIDA, 329 
PARMOPHORUS, Blainv. 
Etym.—Parme, a shield, and phoreus,a bearer. Duck’s-bill 
limpet. Syn.—Seutus, Montf. 
Distr.—12 sp. East Indies, Philippines, Australia. Fossil, 3 
sp. Eocene; Paris basin. P. australis, Bl. (Ixxxiii, 21). 
Shell lengthened-oblong, depressed; apex posterior; front 
margin incurved. Muscular impression horseshoe-shaped, elon- 
gated. The shell is smooth and white, and permanently covered 
by the reflected borders of the mantle. The animal is black, 
and very large compared with the shell; its sides are fringed 
with short cirri, and its eyes sessile on the outer bases of thick 
tentacles. Occurs in shallow water, walking freely. 
TUGALIA, Gray. Shell cancellated, with crenulated margin. 
P. elegans, Gray. 

CoccuLina, Dall. 
Distr.—2 sp. New England, deep waters. C. Rathbuni, Dall. 
Shell patelliform, apex posteriorly inclined, with a deciduous 
spiral nucleus ; margin entire. 
Animal blind, with prominent head and muzzle; two tentacles; 
gill single, plumose, asymmetrical, extending between the under 
surface of the mantle and the foot (from a point above and 
behind the head) backward on the right side; anal opening above 
and behind the head; mantle-margin plain; margin of the foot 
without processes, excepting a single filament on each side. 
Radula with a small or moderate rachidian tooth, three incon- 
spicuous and a fourth larger, dentate laterals, uncini numerous. 
The male has a verge permanently exserted from the inner side 
of the right tentacle. 
The shell resembles that of the Patellidse, but the animal is 
more nearly allied to the Fissurellide. Mr. Dall has formed a 
family for the two species known. 
Apprsonia, Dall. 
tym.—In honor of Prof. Addison E. Verrill, of Yale College. 
Distr.—2 sp. New England, Mediterranean Sea. “A. paradoxa, 
Dall. 
Shell ovate, subconical, strongly asymmetrical with curved 
apex; no epidermis; margin plain. 
Animal with two tentacles; no eyes; foot and mantle without 
tubercles or processes; gill composed of leaflets as in Patella, 
the series starting on the right behind the head and continued 
within the mantle-edge backward, the body of the animal being 
asymmetrically placed with regard to the aperture of the shell 
to afford room for the enormous series of branchial leaflets ; anus 
opening behind and above the head slightly to the right of the 
median line, and indicated by a small papilla. Radula with 
22 
