CLASS GASTROPODA 
51 
brown fluid. The muscular stomach or gizzard contains eleven pentagonal 
corneous bodies, which fit raised areas on its wall. The largest of these 
bodies was 14 x 10% x 10% mm. The alimentary canal contained seaweed. 
(Cockerell.) 
Type locality, San Pedro, California. 
Range. Known only from the type locality. 
Family TYLODINIDAE 
Genus TYLODINA Rafinesque, 1819 
Corps rampant, a petite coquille dorsale exterieure, membraneuse, sans 
spire, ovale, a pointe calleuse, palliliforme. 4 tentacules, les 2 posterieurs 
eloignes et plus grands, branchies dorsales sous la coquille a droite, du 
cou.— T . punctulata , pointille de brun, tentacule obtus; coquille lisse. 
(Rafinesque.) 
Shell limpet-like, depressed, apex-subcentral, with a minute spiral 
nucleus. (Woodward, Manual of the Mollusca.) 
Type. Tylodina punctulata Rafinesque. ( Tylodina citrina Joannis.) 
Distribution. Mediterranean, Norway, Gulf of Mexico, California. 
Fossil: Tertiary. 
Tylodina fungina Gabb, 1865 
Plate 2, figs. 20a, b 
Proceedings of the California Academy of Sciences, 3:188. Bulletin 112, United States 
National Museum; PI. 15, figs. 15, 16, 17. 
T. testa sub-elliptica, elevata; apice sub-centrali; epidermide rufo- 
brunea, prope apicem lutea, ultra marginem testae projecta; intus lutea, 
prope marginem caerulescens. Long., 1.3; lat., 1.1; alt., .5 mm. (Gabb.) 
Shell subelliptical, elevated; apex sub-central, blunt; epidermis reddish- 
brown, yellowish on and near the apex, projecting beyond the margin of 
the shell; color internally straw-yellow, shading toward the margin into 
a bluish white. (Gabb.) 
Type in Survey Cabinet, Mollusca No. 994. Type locality, Santa 
Barbara Island, California. 
Range. Santa Barbara Island to San Diego, California. 
Family PLEUROBRANCHIDAE 
Genus PLEUROBRANCHUS Cuvier, 1804 
Shell internal, large, oblong, flexible, slightly convex, lamellar, with a 
posterior sub-spiral nucleus. (Tryon, Structural and Systematic Con¬ 
eirology.) 
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