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 oi the beaks in Lexingtonia. 
LASTENA LATA (RAFINESQUE). (Ortmann, l. c., p. 556.) 
The description of the anatomy will be found in Naovrtr. 28, 
1, ps LOG. 
LASMIGONA (ALASMINOTA) HOLSTONIA (LEA). (See: Lasm. 
(Sulcularia) badia (Raf.) (Ortmann, |. c., p. 557.) 
The anatomy has been described in Nauti. 28, ’14, p. 481. 
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, 713; Sept. 8, 12, 715; Sept. 20, ’12; and in 
spring on May 12, 714; 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. Carn. Mus. 8, 712, p. 295, and Nauti. 
28, ’14, p. 46. 
Also here additional material has been secured throwing more 
light on the beginning of the breeding season. Dates for gravid 
Jemales are as follows: Sept. 2, 4, 5, 714; Sept. 6, 718; 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, 
ey. pools) 
I have collected a number of specimens of this species in 
Pigeon River, at Canton, Haywood Co., N. Car., on May 14, 
