G38 MOLLUSCA. 



ORDER I. PEDUNCULATA, 



Consists of five genera:—!. Otion ; 2. Cineras; 3. Pollicipes; 4. Scalpel, 

 lura ; 5. Anatifa. — Of which we have represented the following-. 



Olion Blainvillii.—B\a\nvine'3 Otion. Plate Ixxxi fig. 1. Ash-coloured, 

 the body and horns spotted with black. Inhabits the North seas. 



Cineras atirattis.— The Eared Cineras. Plate Ixxxi. fig. 2. Greenish ash- 

 colour, clouded and streaked with black ; wrinkled towards the base. In- 

 habits the coasts of England. 



Pollicipes cornucopia. — The Cornucopia Pollicipes. Plate Ixxxi. fig. 3, 

 Peduncle covered wi-th imbricated scales, the base of the scales towards the 

 bottom of the peduncle rounded, and pointing upwards. Inhabits the Euro- 

 pean seas. 



Scalpellum vulgare.— The Common Scalpellum. Plate IxxxL fig. 4. 

 Valves rough, the dorsal one compressed ; covered with short hairs ; pedun- 

 cles short, annulated, and hairy. Inhabits the British s-eas. 



Anatifa Icevis.— The Smooth Anatifa. Plate Ixxxl. fig. 5. With five 

 smooth valves ; the dorsal valve rounded at the sides, and slightly carinated; 

 peduncle very long, of a scarlet colour. Inhabits the British seas 



ORDER II. SESSILIA, 



Contains six genera : — 1. Pyrgoraa ; 2. Creusia ; 3. Acasta ; 4. Balanus ; 

 5. Coronula; 6. TubicineUa. 



Pyrgoma crenata. — The Crenated Pyrgoma. Plate Ixxxi. fig. 6. With 

 radiated ribs, and crenated round the margins ; of a pale violet colour. 



Creusia verruca. — The Warted Creusia. Plate Ixxxi. fig. 7. White ; 

 slightly depressed, with interwoven obliquely striated valves ; the margin at 

 the base irregularly serrated. One-fourth of an inch broad. Inhabits the 

 British seas. 



Acasta Montagui. — Montagu's Acasta. Plate Ixxxi. fig. 8. Valves erect, 

 triangular, acute, with muricated ascending spines. Inhabits the British 

 seas. 



Balanus candidus. — The White Balanus. Plate Ixxxi. fig. 10 and II. 

 White ; valves nearly smooth ; operculum strongly ridged transversely with 

 longitudinal, nearly obsolete striae. Two inches broad at the base. Inha. 

 bits the Frith of Forth. 



Coronula diadema. — The Crown Coronula. Plate Ix.xxi. fig. 12. Some, 

 what compressed, with six prominent longitudinally ribbed valves ; alter, 

 nating with as many depressed transversely striated ones. Found attached 

 to the skin of whales iu the North seas. 



TubicineUa Balanarum. — The Whale TubicineUa. Plate Ixxxi. fig. 13. 

 Tubular, with transverse ribs, and a ring-shaped margin ; operculum bottle, 

 nhaped. Found adhering to the skin of whales in the South American seas. 



DIVISION III.— ARTICULATA, 



CLASS v.— ANNELIDES. 



The bodies are soft, usually elongated, naked, or inclosed into a tube, and 

 diviili'd into many segments ; with red blood. ' 



