Pomona College, Claremont, California 27 
in the cephalic region close to the median line, two pair on each 
segment of the thorax, two pair each on segments 1 and 2 of the 
abdomen, one pair each on segment 3, 4, 5 and 6 and three pair on 
segment 7 of the abdomen. In the submarginal area between the 
papilla-like pores and the margin is a row of the small circular 
pores and in addition to these some may be found with no apparent 
regularity near the bases of the submarginal papilla pores. The 
sutures of the case are distinct, the last three of the abdomen 
strongly reflexed caudad. The crenulations of the margin are 
broad and the incisions shallow. The submarginal area is not set 
off by a raised ridge or depression. Vasiform orifice subcordate, 
with the anterior margin straight, the lateral margins with corru- 
gations or folds extending inward and downward; operculum 
shaped similar to that of the orifice with the caudal end slightly 
truncate, one-half filling the orifice; lingula subspatulate, densely 
setose, extending about three-fourths of the length of the orifice, 
bearing at its distal extremity three pair of lateral lobes and a pair 
of terminal lobes. Thoracic tracheal folds not evident. Just 
laterad of the anterior margin of the vasiform orifice is a pair of 
\ oN Lt 
286 . x08 5 
fayoia) 
NSN 
_ AAW ANA 
a ly 
Fig. 2. Asterochiton corollis n. sp. a, pupa-case; b, vasiform orifice, caudal 
furrow and section of the caudal margin; c, pupa-case showing the 
wax secretions. 
