128 SYSTEMATIC ARRANGEMENT 



b. Siliquariana. Mantle and shell with a longitudinal slit. Oper- 

 culum many-whorled. 



8. Siliqtjaria. 



Operculum spiral, fringed. Foot end truncate, circular. — Adams, 

 Gen. Moll. t. 39. f. 5 a, from Philippi. 



1. S. anguina, t. 58. f. 2. Tenagoda a., Adams, Gen. Moll. t. 39. f. 5. 



2. S. rosea, t. 56. f. 3. 



Shell tubular, internally glassy, irregularly twisted; apex attenuate, 

 sometimes spiral, with a longitudinal fissure running the whole 

 length. Body cylindrical. Foot porrect, cylindrical, truncate in 

 front, operculated. Head behind the foot, small, rounded. Tenta- 

 cula two, lateral, cylindrical, obtuse, short. Mouth vertical, small. 

 Eyes at the outer base of the tentacles. Mantle adnate to the belly, 

 and back to the middle of the body, free with a longitudinal slit on 

 the right side ; right lobe narrow, hinder lobe much broader. Gills 

 on the left lobe in a simple series of rather short threads, produced 

 to the hinder part of the body. Rectum and oviduct parallel on 

 the right side. Retractor muscle, as in other Gasteropods, fixing 

 the body to the shell. Hinder part of body consisting of the small 

 green liver and very large golden oviduct. Hermaphrodite. 



III. Leptopoda. 



Foot compressed : for leaping. Gills comb-like, distinct, on left side 

 of mantle-cavity (see p. 64). 



I. Eyes pedicelled, with a small tentacle on the side. 



Fam. I. STROMBIDjE. 



Muzzle elongate, produced, annulated. Eyes on the top of thick, 

 elongated peduncles, with the tentacles on the sides. Foot compressed, 

 rather dilated in front, tapering behind. Siphon of mantle and 

 canal of the shell elongate, straight, or rather bent to the left. The 

 left side of the mantle of the adult more or less expanded or lobed. 

 Shell solid, spiral, whorls compressed. Mouth linear. Operculum 

 annular, horny * claw-like, serrated on the outer side (fig. 63). 



a. Strombina. Tentacles on middle of eye-pedicels. Operculum 

 claw-like. Mantle and outer lip of shell produced. 



* Sinus in outer lip of shell separated from the canal by a broad 



lobe. 



1. Strombtjs. 

 Shell : outer lip expanded, entire. 

 1. S. gigas, t. 80. f. 2, t. 81. f. 4, t. 83. f. 1. 



