Kansas University quarterly . owing convexity of the same. Fig. lb. Outline showing the convexity of the adult long-hinged forms. Figs, ic and d. Young specimen of the long-hinged formshowing different degrees of development of the hinge and natural size. Fig. 2. Pscudomonotis roluista. Left valve of type. The strireare finer and more wavy than represented, and the upper third ispractically glabrous, only the faintest traces of stria? being present-About natural size. Fig. 2a. Anterior view of the same shell, showing gibbosityand arcuity of shell, as well as concentric lines of grow
Kansas University quarterly . owing convexity of the same. Fig. lb. Outline showing the convexity of the adult long-hinged forms. Figs, ic and d. Young specimen of the long-hinged formshowing different degrees of development of the hinge and natural size. Fig. 2. Pscudomonotis roluista. Left valve of type. The strireare finer and more wavy than represented, and the upper third ispractically glabrous, only the faintest traces of stria? being present-About natural size. Fig. 2a. Anterior view of the same shell, showing gibbosityand arcuity of shell, as well as concentric lines of growth. Aboutnatural size. Figs, ab and 2c. Anterior and lateral views of the left valve ofa young individual of the above shell. About natural size. Fig. 3. Pseiidomonotis Jiawni cqiiistriala. Left valve of type. Alittle less than natural size. Figs. 3a and 3b. Anterior views of two left valves showingvariation in convexity and indistinctness of beak. About naturalsize. Kan. Univ. (^), Vor>. VIII, Series A. liLATE PLATE XIX. Fig. I. rscitdomonotis Cf. Jiaunii. Left valve showing posteriorlobation and contortion of costre and striae. The lobe is not sepa-rated from the rest of the shell very distinctly in most of thespecimens, being more of a prolongation of the postero-ventralpart backwards. Natural size. Fig. la. Interior of right valve of a specimen, in all probabilityof this form, showing the very deep byssal sinus and the locationof the retroactor scars behind the byssal sinus instead of on theear above. It also shows the adductor scar and traces of radiatingribs are visible on the interior. Natural size. Figs. lb and le. Outlines illustrating degrees of gibbosity ofthese shells. Fig. id. Another specimen showing more clearly the radiatingstriae and costae and possessing a more distinct posterior lobe. Figs, ic and if. Views from above of two specimens of thisshell showing the form of the umbo. Figs. 2 and 2a. Right and left valves of a specimen ofPseudomonotis
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlawrencekansastheu
