424 



MONOTOCARDIA— RACHIGLOSSA 



CHAP. 



Jumald)^ subg., Sipho ; Siplionalia (subg., Kelletia), Group ii. 



Liomesus (^ = Buccinopsis^. Group iii. Bucciniim (Fig. 1b, p. 6; 



subg., Volutharpa^ Neohuccinum). Group iv. Cominella^ Triton- 

 idea^ Pi^ania, Euthrla ; ^nM?^^ (Miocene), 

 Grenea (Pliocene), Metula^ Ungma. Group 

 V. JPhos, Hindsia. Group vi. Dlpsaccus ( = 

 Ehurnd)^ Macron. Group vii. PseudoUva. 

 Fam. 6. Tu7^hinellidae. — Central tooth 

 of radala tricuspid, median cusp strong, 

 lateral bicuspid, cusps unequal (Fig. 117, p. 

 220) ; shell fusiform or pear-shaped, heavy, 

 canal often long, operculum corneous, claw- 

 shaped, nucleus terminal. Miocene . 



Principal genera: Turhinella^ Cynodonta^ 

 Tudicla (subg., Streptosiphoii) ; Piropsis 

 (Cretaceous), Perissolax (Cretaceous), 



Fig. 280. — TurbineiiapT/r- Strepsidura (Eocene, subg., Whitnem}, 



J071 Lam., Ceylon, x §. 71^ 7 . t7 7 ^ 7^ t^- t rn. 



Melapium, ±utgur (^ = Bu8ycon^ rig. loU, 



p. 249, including Sycotypus^, Melojigena (subg., Pugilina., 



Myristica^ ; Liostoma (Eocene), Hemifusus (subg., Megala- 



tractus)., Ptychatr actus., Meyeria. 



Fam. 7. Fasciolariidae. — Eyes at the outer base of the tenta- 

 cles (radula. Fig. 121, p. 221) ; shell 

 fusiform, spire long, canal often very 

 long, columella often with a fold at 

 the base; operculum corneous, nucleus 



terminal. Cretaceous . Principal 



genera : Fusus (including Sinistralia, 

 Aptyxis^ Tro8clielia\ with subg., Serri- 

 fusus (Cretaceous), Clavella (subg. 

 Thersites')^ Fasciolaria., Latirus (subg. 

 Polygona., Peristernia^ Leucozonia, La- 

 gena; Mazzalina (Eocene), Ohascax^. 



Fam. 8. Mitridae. — Siphon rather 

 long, with anterior appendages, eyes 

 on the side of the tentacles, proboscis 

 very long ; radula variable, laterals 

 sometimes lost (Fig. 120, p. 221); 

 shell fusiform, solid, spire more or less pointed, columella with 

 several prominent folds, the posterior the largest, aperture rather 



Fig. 281. — Latirus (Leucozonia) 

 cingulatus Wood, Panama. 



