1870.] 



•24? 



[Dail. 



exigua, p. 400. P. rainus- 



cula, p. 399. 

 (Striatwa Morse.) S. milium, 



p. 401. S. ferrea, p. 401. 

 (Conulus Fitz.) C. chersinus, 



p. 402. 



Vallonilnce. 

 Vallonia Risso. 



V. minuta, p. 428. 

 Helicodiscus Morse. 



H. lineata, p. 404. 

 Planogyra Morse. 



P. asteriscus, p. 415. 

 Patula Hald. 



P. striatella, 1 p. 413. 

 Strobila Morse. 



S. labyrinthica, p. 415. 

 Punetuin 2 Morse. 



P. minutissimum, p. 403. 



succiniid^e Martens. 



Suecinea Drap. 



S. ovalis, p. 445. S. avara, p. 



446. S. obliqua, p. 447. 

 S, Totteniana, p. 448. 



pupid^e Morse. 



Zua 3 Leach. 



Z. labrica, p. 431. 

 Acantiiinula Beck. 



A. liarpa, p. 427. 

 Pupilla Leack. 



P. muscorum, p. 433. P. 

 Hoppii, p. 433. P? pento- 

 don, p. 434. P. decora, p. 

 435. 

 Leucoeheila A. & M. 



L. fallax, p. 436. L. armif- 



era, p. 437. L. contracta, 



p. 438. L. rupicola, p. 



439. L. corticaria,p. 439. 



Isthmia Gray. 



I. Gouldii, p. 440. I. milium, 

 p. 441. I. Bollesiana, p. 

 442. I. ovata, p. 442. I. 

 ventricosa, p. 443. I. sim- 

 plex, p. 444. 



Suborder Limnophila. 



AUPvICULID^E. 



Alexia Leach. 



A? myosotis, p. 463. 



Melampus Mont. 



M. bidentatus, p. 467. 

 Carychium Mull. 



C. exiguum, p. 466. 



1 Quite distinct from P. Cronkheitii, of which I have authentic specimens. 



2 This genus, in the form of a subfamily', would require to be transferred to the 

 Orthalicidce, if the conformation of the jaw, as figured by Morse, should be con- 

 firmed. The jaw of H. pygmcza figured by Lindestrom (Gotl. Moll., PI. iii, fig. 12), 

 shows characters which indicate that some misapprehension has occurred ; which 

 is not at all improbable considering the extreme minuteness of the object. 



3 Compare the dentition of this species, as figured by Morse, with that of Vallo- 

 nia minuta. Also Strobila with Leucoeheila corticaria and Pupilla badia; also 

 Punclum with Carychium and Planogyra with Isthmia ovata. The distinction be- 

 tween Leucoeheila, as it stands, and Pupilla, is very fine drawn and not at all 

 definite. 



