Introduction to Animal Morphology. 309 



outer border with (rarely without, Bela) an anterior notch ; 

 operculum lamelloseornone (Mangilia). 10. Cancellariidae 

 spiral, ovate shells ; proboscis none ; tentacles far apart, with 

 basal eyes ; operculum none ; foot small, triangular. 



Series III. Hamiglossata (i-i-i). Families, n. Muri- 

 cidce shell with foliaceous or spiny varices, a straight canal ; 

 eyes at the bases of the tentacles ; foot broad, single in front, 

 with leaf-like operculum. Murex has at least three rows of 

 varices ; Typhis has hollow spines ; Trophon a crown of la- 

 mcllose varices ; Fusus is spindle-shaped, with an oval mouth; 

 Pvrula pear-shaped, with a wide opening ; Columbella thick, 

 with a narrow mouth ; Fasciolaria has fusiform shells, whose 

 outer lip is striped transversely. 12. Buccinidse anterior 

 canal short ; foot large ; border of the outer lip smooth 

 (Buccinum), or toothed (Nassa), often cancellated (Phos), or 

 smooth, oval (Pusionella) ; canal sometimes reduced to a 

 notch (Purpura). In Concholepas the mouth is very wide, 

 and the spire almost none ; Monoceros has a strong tooth on 

 its outer lip ; Magilus, living in coral, has, when young, a re- 

 gular spiral shell, but becomes irregular as age advances. 

 13. Mitridae shell smooth, with a pointed spire, small mouth, 

 and sharp columellar folds ; proboscis long ; operculum none 

 or small. 14. Olividae foot large, trigonal, divided into 

 fore and hind lobes ; eyes medial, stalked ; proboscis short ; 

 siphon long ; shell cylindrical, smooth (Oliva, &c.), or lon- 

 gitudinally ribbed (Harpa). 15. Volutidae rachiglossal ; shell 

 notched anteriorly at pcritreme ; columella sharply folded ; 

 siphon long ; proboscis short ; operculum none ; shell oval. 



:ion 2. Ilolostomata herbivorous, with no 

 siphon, and an entire peritreme. This ineliules the fol- 

 I. I'tenoglossa (oo .o co ), including, 16. Sca- 

 lariidse foot smal! e of the ten: 



limn COR piral ; shell aeiculate, while, lon- 



gitudinally rib! 17. Solariiihu shell trochiform, 



ular, widely unibilieated ; mouth four-ai 

 Of the lower ^roove-like hollow ten 



18. lanthi;. -11 thin, snail-like, bluish, with thin lips; 



>ur; pel.i-i. inof.en ulate forms, SC- 

 :ng a purple fluid ; eggs cohering into a " ra: 



