. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. ()ii the left valve there is a cavity corre-sponding to this tooth. (In the accompanying figure 5 this tooth is only indicatedschematically by a curved line.) I did not succeed in finding any hinge tooth posteriorlyeither on the right or the left valve. The selvage is very wide along the anterior andposterior margins of the rostrum and along the jjosterior margin of the rostral incisur —the incisur is quite filled by it — and along the anterior part of the vential margin ofthe shell; it continues along the whole ve
. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. ()ii the left valve there is a cavity corre-sponding to this tooth. (In the accompanying figure 5 this tooth is only indicatedschematically by a curved line.) I did not succeed in finding any hinge tooth posteriorlyeither on the right or the left valve. The selvage is very wide along the anterior andposterior margins of the rostrum and along the jjosterior margin of the rostral incisur —the incisur is quite filled by it — and along the anterior part of the vential margin ofthe shell; it continues along the whole ventral margin of the shell, extending somewhatoutside the edge. It is uniformly and finely cross-striated and is extremely finely, almostinvisibly, serrated at the edge or else smooth-edged. The shell is |)resuinal)ly ratheistrongly calciferous — although the type specimen had a soft shell, not calcilerous; a larva,preserved in the same lii|Mi(l as the type specimen, in its sliell nuinerous roundedcalcareous concretions, SI iiiliiS nil inaiilir Osliiicods 303. Fig. LIII. — C. (Siphonoalra) spinifera il. S|)., 9- — ?• -Slull. ^^<ll from the side; «() X. i. Shell, .seen finm lielow. the opening of the siphon reprosenlod by a dolled circle; 31 X. 5. .Vnterior part of the righl valve, seen from the Inner side: iri8 X. fi. One of the anterior bristles on the list jnsl behind Ihe rostral incisnr of the shell: 617 X. Tpper lip. seen fiom the side: Ififi X. S. Fiirca: Ihe serond:iry liith of Ihe rlaws are not drawr.: Ififi X. F i r s t a n t c n n a: — The fifth and sixth joints, although still free, seem to showa certain tendency to become joined to each other. The approximate proportions betweentlic joints are as follows: I %; 11|: III I; IV : V I; YT |: VII |: VIII (».3. The most striking fact is perhaps the great reduction of the third joint; this joint has, however,no marked tendency to become joined to the neighbouring joints. The posterior bristle of thet
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectostraco, bookyear1920
