THE NAUTILUS. 87 



in Lexingtonia, and have a lanceolate, compressed shape, so that 

 the charged marsupial gills, even in young specimens, are con- 

 siderably more swollen. The two species also differ in the 

 beak-sculpture, which, in P. oviforme, consists of about four 

 subconcentric, rather indistinct bars, which are slightly angular 

 and nodulous upon the region of the posterior ridge; but there 

 is no trace of the fine, wavy, and crowded bars seen on the an- 

 terior side of the beaks in Lexingtonia. 



LASTENA LATA (RAFINESQUE). (Ortmann, 1. c. , p. 556.) 



The description of the anatomy will be found in NAUTIL. 28, 

 '15, p. 106. 



LASMIGONA (ALASMINOTA) HOLSTONIA (LEA). (See: Lasm. 

 (Sulcidaria) badia (.Rcr/. ) (Ortmann, 1. c. , p. 557.) 



The anatomy has been described in NAUTIL. 28, '14, p. 431. 



Additional specimens have been obtained subsequently, con- 

 firming the previous account, and furnishing more complete 

 records for the breeding season. Gravid females have been col- 

 lected on Sept. 6, 7, '13; Sept. 8, 12, '15; Sept. 20, '12; and in 

 spring on May 12, '14; May 18, '15. Glochidia have been 

 found as early as Sept. 20; and on the two dates in May, dis- 

 charge of glochidia was observed. Thus this species is brady- 

 tictic, breeding from September to May. 



ALASMIDONTA (PRESSODONTA) MINOR (LEA). (See: 1. c., p. 580.) 

 Anatomy, see 'Ann. Cam. Mus. 8, '12, p. 295, and NAUTIL. 

 28, '14, p. 46. 



Also here additional material has been secured throwing more 

 light on the beginning of the breeding season. Dates for gravid 

 females are as follows: Sept. 2, 4, 5, '14; Sept. 6, '18; Sept. 9, 

 11, '15; Sept. 17, 20, '12. Glochidia have been observed on 

 the last two dates. This places the beginning of the season in 

 September. 



ALASMIDONTA (DECURAMBIS) RAVENELIANA (LEA). (Ortmann, 

 1. c., p. 561.) 



I have collected a number of specimens of this species in 

 Pigeon River, at Canton, Hay wood Co., N. Car., on May 14, 



