GASTROPODA. '"'' 



ll<rl 1 



TROCHOITKMA (KnwiA) SAI.TKKI. n. sp. 

 i-i \ri i.\\\ 11 nos.1 



Shell 90 to 30 mm. in bight; width across the body whorl about three-fourth* of the hlght; apical 



Whorls four or five, angular, with a gently concave slope above nearly to the suture, and 



vertical flat peripheral band; base moderately ventrlcose, umbll m-ly small <>r 



w.intnik': .;.- t the suture a slight angularity. Of the two peripheral angles the upper Is the more 



prominent, the I..W-T U'lng comparatively obtcure, especially near the aperture Lines of growth fine, 



HIT the whorls somewhat obliquely backward and downward, the direction \-\n^ almost uniform on 

 all part-; slightly sinuate on the base. Aperture obscurely triangular In outline, somewhat effuse below, 

 with the Inner Up nearly stra 



Jnnmtt ttriyiUatum Sailer Is a higher thell, and differs more Importantly In having the line* of 

 growth turned forward Instead of backward after crowing the upper of the two peripheral car lose. 



r. taluri resembles species of Lophosptra very greatly, and collectors may find It difficult to recog- 

 nize unless they are fortunate enough to meet with good specimens retaining either the mouth or some of 

 the surface markings. 



and ioeaUty. Lower half of Fuslsplra bed, Trenton group, Goodhue county, Minnesota. 

 CWUcsioto. Geological and Natural History Survey of Minnesota ; E. O. Ulrlch. 

 M***m Rtffitter, No. 7375. 



TROOHONRMA (EUNKMA) NITIDUM, n. sp. (Ulrich.) 



PLATE LXXVII. FIG8. 44 and 4. 



Related to T. tnlteri, but has a shorter and smaller spire, and proportionally larger and much more 

 venirlcoM body whorl. The lower margin of the peripheral band also Is more obscure, the upper slope 

 more concave, the Knee of growth very fine and more nearly vertical, the Inner Up not so straight and the 

 aperture leas oblique and more ovate. The specimen Illustrated may be said to be of the average sice, 

 though we have an interior cast of one that was fully twice as large. 



formation and locality. Utlca group, Cincinnati, Ohio, and localities In the vicinity of that city. 

 CWtsetfon. K. O. Clrlch. 



TROCHONKXA (ETJNKXA) ROBBINBI, n. sp. 



PLATE LXXVI. KIOS. 11-14. 



This also Is related to T. talteri, yet may be distinguished very easily by Its more depressed, subcon- 

 Ical, shape, much less ventrlcose bate, perfectly even and longer upper slope, and more prominent and 

 sharper lower angle. Th- umt.ilical peiforatlon is very small and mostly covered by the rv flexed Inner lip. 



The specific name Is given In honor of Dr. C. 11. Kobblns, of Wykoff, who first brought the shell to 

 our notice. Wears Indebted to this gentleman for many good specimens and courtesies while visiting 

 his locality. 



Formation and locality Fuslsplra bed. Wykoff, Minnesota. 

 CWtoettoM.-G)k)glcal and Natural History Survey of Minnesota; K. O. Ulrlch. 

 ITntSMM Beyitttr, No. 7518. 



TROCBONBMA (EVNEMA) SIMII.K, . sp. 

 figured.) 







This form is in some respect* intermediate between T. fallen and T. roMiiui. beta* more depressed 

 than the former and not as much as the latter. The angles are slightly more prominent than In either. 



