Page:Smithsonian Miscellaneous Collections, Volume 85.djvu/111

Rh Carapace.—The carapace when viewed from its dorsal side is elongate, narrowed anteriorly, expanded posteriorly, and has the outline of two broad lobes by the incurving of the rounded posterior margin



a, antennae; a ' , antennules; a.l., abdominal limbs; a.o., anal opening; c, carapace; c.f., caudal furca; c.l., cephalic limbs; e, eye; en, endopodite (??); ex, exopodite; h.c., hepatic caeca; i, intestine; r.p., rostral plate; sh.gl., shell gland; st, stomach; th.l., thoracic leg.

(About ✕ 3.5.) Diagrammatic outline of ventral view of appendages and digestive organs. Most of the data on which this figure is based are shown by specimens illustrated on plates 19 and 20.

towards the median line; when folded over on its longitudinal axis each side is a long semi-oval with the narrow end in front; there is no evidence of the presence of a longitudinal median line or hinge in the many specimens collected from the Burgess shale.