_Acanthia elongata_ Conr. Angled Unicorn. Fig. 95. _Acanthia spirata_ Blain. Fig. 96. _Murex gemma_ Sby. Fig. 97. _Murex (Tritonalia) lurida_ Cpr. Lurid. Fig. 98. _Murex (Tritonalia) gracillima_ R. E. C. S. Fig. 99. _Murex (Tritonalia) circumtexta_ R. E. C. S. Fig. 100. _Murex (Tritonalia) poulsoni_ Nutt. Fig. 101. _Epitonium hindsii_ Cpr. White Wentletrap. Fig. 102. _Epitonium crenatoides_ Cpr. Fig. 103. _Actæon puncticælatus_ Cpr. Barrel Shell. Fig. 104. _Mitra idæ_ Melv. Ida's Miter Shell. Fig. 105. _Mitra lowei_ Dall (?). Fig. 106. _Alectrion (Nassa) perpinguis_ Gld. Fig. 107. _Arcularia (Nassa) tegula_ Reeve. Cover-lip. Fig. 108. _Turris ophioderma_ Dall. Pencilled Drill Shell. Fig. 109. _Potomides (Certhidæ) californica_ Hold. California Horn Shell. Fig. 110. _Myurella simplex_ Cpr. Simple Auger Shell. Fig. 111. _Amphissa versicolor_ Dall. Joseph Coat. Fig. 112. Slightly enlarged. _Calliostoma canliculatum_ Mart. Channeled Top Shell. Fig. 113. _Polynices recluziana_ Desh (?). Southern Moon Shell. Fig. 114. under side. _Amalthea antiquata_ Linn. Ancient Hoof Shell. Fig. 115. _Amalthea tumens_ Cpr. Sculptured Hoof Shell. Fig. 116. _Fossarus fenestratus_ Cpr. Windowed Isapis. Fig. 117. _Lacuna unifasciata_ Cpr. One-banded Chink Shell. Fig. 118. _Melampus olivaceus_ Cpr. Olive Ear Shell. Fig. 119. _Janthina trifida_ Nutt. Violet Snail. Shell violet. Jahraus collection. Fig. 120. _Leptothyra carpenteri_ Pilsb. Red Turban Shell. Fig. 121. _Leptothyra baccula_ Cpr. Berry Turban. Fig. 122. _Calliostoma tricolor_ Gabb. Three-colored top shell. Fig. 123. _Haliotis rufescens_ Swains. Red Abalone. Quite common near Laguna. _Haliotis cracherodii_ Leach. Black Abalone. More common than the red. TOOTH SHELLS _Dentalium neohexagnum_ S. and P. Hexagonal Tusk Shell. Dredged off Laguna. CHITONS _Mophia hindsii_ Sby. Hind's Chiton. Fig. 124. _Mophia mucosa_ Gld. Mossy Chiton. Fig. 125. _Ischnochiton clathratus_ Rve. Fig. 126. _Ischnochiton magdalensis_ Hinds. Gray Chiton. Fig. 127. _Nuttallina scabra_ Rve. Scaly Chiton. Fig. 128. _Nuttallina californica_ Nutt. California Chiton. Fig. 129. _Trachydermon dentiens_ Gld. (Pseudodenturus). Fig. 130. _Lepidopleurus rugatus_ Cpr. Fig. 131. _Callistochiton crassicostatus_ Pilsb. Thick-ribbed Chiton. Fig. 132. _Tonicella hartwegii_ Cpr. Hartweg's Chiton. Fig. 133. SMALL SHELLS Wash Drawings by Miss M. Cate _Caecum californicum_ Dall. Common at Laguna Beach. Pl. IV. Fig. 1 ×10. _Vitrinella williamsoni_ Dall (?). Pl. IV. Fig. 2 ×10. (This specimen in the Bradshaw collection was so determined, probably at Washington.) Arch Beach, Cal., near Laguna. _Columbella chrysalloidea_ Cpr. Shell white. Pl. IV. Fig. 3 ×10. _Columbella pencillata_ Cpr. White shell, cross lines brown. Pl. V. Fig. 1 ×6. _Columbella gausapata_ Gould. Common Dove-shell. Brown mottled. Pl. V. Fig. 2 ×6. _Liotia acuticostata_ Cpr. Sharp-ribbed Liotia. Pure white. Pl. V. Fig. 3 ×6.