424 



MONOTOCARDIA— RACHIGLOSSA 



CHAP. 



Fig. 280. — Turhinella pyr- 

 wm Lam., Ceylon, x §. 



Jumala)^ subg., Sipho ; Siphonalia (subg., Kelletia). Group ii. 



Liomesus Q = JBuccinopsis'). Group iii. Buceinum (Fig. 1b, p. 6; 



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

 idea^ Pisania, Euthria ; Anura (Miocene), 

 G-enea (Pliocene), Metula, Engina. Group 

 V. Phos^ Hindsia. Group vi. Dipsaccus ( = 

 Ehurna)^ Macron. Group vii. Pseudoliva. 

 Fam. 6. Turhinellidae. — Central tooth 

 of radula 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., Strepto siphon') ; Piroj>8is 

 (Cretaceous), Perissolax (Cretaceous), 

 Strepsidura (Eocene, subg., Whitneya)^ 

 Melapium^ Fulgur Q = Busycon^ Fig. 150, 



p. 249, including Sycotypus)., Melongena (subg., Pugilina, 



Myristied) ; Liostoma (Eocene), Hemifusus (subg., Megala 



tr actus), 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, Troschelia), with subg., Serri- 



fusus (Cretaceous), Clavella (subg. 



Thersites), Fasciolaria, Latirus (subg. 



Polygona, Peristernia, Leucozonia, La- 



gena; Mazzali^m (Eocene), Chascax). 

 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. 2S1. — Latirus {Levcozonia) 

 dngulatus Wood, Panama. 



