332 
has in my specimens a more evenly rounded periphery than in 
Kriiger’s figure. 
While the tergum in my specimens agrees with Kriiger’s 
description, the scutum shows some differences; the plate is 
strongly bent with a concave outer side adorned with regular 
ridges of growth; the interior side is only feebly sculptured with 
a low adductor ridge 
that does not reach the 
apex, but makes a bend 
towards the occludent 
margin somewhat below 
it. The pit for the lat¬ 
eral depressor is distinet, 
and basally situated at 
the commencement of 
the adductor ridge. The 
articular ridge is little 
prominent, but a narrow, 
although deep articular 
furrow is developed; the 
latter seems to be en- 
tirely absentin Kriiger’s 
drawing. 
In spite of these small 
Fig. 68. Acasta Dofleini, off Jolo. a labrum, b man¬ 
di ble, c maxilla, d basipodite of cirrus IV, e seg¬ 
ment 8 and 9 of cirrus IV, f segment 29 and 30 of 
cirrus VI. [All figures X 33]. 
differences it seems ob- 
vious that the specim¬ 
ens belong to the same 
species. As Kriiger had 
only access to empty shells, I shall give some details as to the 
body of the animal. 
The labrum (Fig. 68a) is narrow and furnished with one dent- 
icle at the side of the deep notch; the crest is here armed with 
small hairs. 
The man di ble has three almost equidistant main teeth, the 
lower two double. The lower angle is pectinate, but the pectination 
is worn off in older specimens about moulting. 
The maxilla is broad; the upper spine is hardly longer than 
the other ones; a feeble notch is indicated below the upper two 
