3-±6 On the genus Pompholyx and its Allies, 



relations with Pompholyx are very close. Many small embry- 

 onic shells were found in the dried remains of the animal. 



Physa (fontinalis, Jieterostro2)ha). 



Buccal plate chevron-shaped or triangular with the sides excavated ; 

 strongly striate, apex posterior; occasionally membranous or absent. 



No accessory plates. 



Ten taenia filiform, long, with a small basal auricle. Eyes at the 

 front of the head, near or on the inner bases of the tentacles. 



< tenitalia on the left side. Foot acutely pointed behind. 

 Mantle edge digitate or lobed, extending partly over the shell. 

 Teeth (P/ii/sn hwmerosa Gld. Arizona) alternate, differing widely 



from those of Limtwea. Central tooth wide. Base with projecting 

 processes before and behind. Cusp consolidated with the base, quin- 

 ((Ueilentate. Laterals alternate. Principals strong, obliquely bent, 

 comb-like, 9G in a row on each side. Secondaries, narrow, oblong, 

 anteriorly depressed with a simple rounded cusp. Insertion between 

 the principals. From their extreme tenuity these secondary teeth 

 are liable to be overlooked. They are omitted in all the figures of 

 the teeth of I'hysa, accessible to me. 



< K;i deposited in flattened oval masses, without perceptible covering 



except of jelly-like mucus. 



Shell sinistral, turn-ted, edge continuous. 



Jinl 'in a .1 (fn/pnorum). 



Jaw Btrongly arcuated, thin, cartilaginous. No accessory plates. 

 Tentacles slender, long, filiform. Kyes sessile on a slight expansion 



of their inner baSOB. 



Genitalia on the lefl side. Foot acutely pointed behind. 



Mantle edge simple, nol extending beyond the shell. 



Teeth strongly resemble those of Physa ; centrals broad, base bifid 



before and behind. Shell elongate, sinistrally spiral, margin entire. 

 Ova capsules ovate cylindrical, without membranous envelope. 



• li'iliitUM hit, n.i. Phil.. Luke Nicaragua. 



