Transactions and proceedings of the Royal Society of South Australia (Incorporated) . gement of the auricle, leads, in theadult, to the formation of a pit between the two deep hollow described in this area of the adult earis, however, a secondary feature formed by the relative growthof the surrounding parts. Two genuine pockets are, however, present in the first is the common mammalian pocket in the posteriorportion of the helical margin, and which is generally knownas the sulcus auris posterior. Tlio second pocket is a remark-able one (marked A in figs, 7 and 8) in t
Transactions and proceedings of the Royal Society of South Australia (Incorporated) . gement of the auricle, leads, in theadult, to the formation of a pit between the two deep hollow described in this area of the adult earis, however, a secondary feature formed by the relative growthof the surrounding parts. Two genuine pockets are, however, present in the first is the common mammalian pocket in the posteriorportion of the helical margin, and which is generally knownas the sulcus auris posterior. Tlio second pocket is a remark-able one (marked A in figs, 7 and 8) in the centre of thedeveloping tragus. This tragus pocket becomes covered by thehair of the cheeks in the adult, nevertheless it remains apermanent and remarkable feature of the external ear. Manus.—The digital formula is 2 = 3>4>>5>»1. Clawsare developed at the 17 mm. stage upon digits 2, 3, and 4;but 1 and 5 are clawless. The digits are fusiform, taperingtowards their distal extremities; there are no definitelydeveloped apical pads. Three basal pads are developed, one. Fig. 8. Form of the external ear (from Specimen Male B, Perth). being opposite the base of each clawed digit. The skin of thepalm is granular (see fig. 9). ,—w. Pes.—The digital formula is 4>5>2:3>1. The outstanding features of the foot are the great sizeof the fourth digit and the reduced condition of the first,which bears no claw. The digits are fusiform. Three basalpads are present, one being at the base of digit 5, a larger oneat the base of 4, and a small one at the base of the syndactylouselements. 45 In the 77 mm. embryo the sole is uniformly granular,but at 92 mm. hair has clothed a large area of the plantarsurface of the pes and of digit-s 2 and 3 (see figs. 10 and 11). HF; t^mm
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscience, bookyear1912
