PLATE 39 
Fig. 1. Turris (Bela) tabulata (Carpenter). X 4. Altitude 9 
mm. Station D5788.* 5 
Fig. 2. Thais emarginata var. ostrina (Gould). X 1. Altitude 
17 mm. Presidio.* 
Fig. 3. Thais emarginata var. ostrina (Gould). X 1. Altitude 
17.5 mm. Presidio.* 
Fig. 4. Thais emarginata var. ostrina (Gould). X 1. Altitude 
18 mm. Presidio.* : 
Fig. 5. Thais emarginata var. ostrina (Gould). X 1. Altitude 
20 mm. Presidio.* 
Fig. 6. Monoceros engonatum Conrad. X 1. Altitude 27 mm. 
Pigeon Point, San Mateo County. 
Fig. 7a. Murex foliatus (Martyn). X 1. Altitude 58 mm. Bo- 
linas. 
Fig. 7b. Murex foliatus (Martyn). X 1. 
Fig. 8a. Cerithidea californica (Haldeman). X 1. Altitude 38 
mm. Lake Merritt, Oakland. Specimen from the collection of Pro- 
fessor Wm. 8S. Raymond. 
Fig. 8b. Cerithidea californica (Haldeman). X 1. 
Fig. 9a. Cancellaria crawfordiana Dall. X 1. Altitude 20.5 mm. 
Station D 5789. . 
Fig. 9b. Cancellaria crawfordiana Dall. X 1. 
Fig. 10a. Mangilia augulata Carpenter. X 4%. Altitude 10 mm. 
Station D 5786. 
Fig. 10b. Mangilia augulata Carpenter. X 41%. 
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