GASTROPODA. '"' 7 



Lophoplr (Ulau>r*il> ) 



LOPHOSIMKA. K1I.I.MOREN8I8, H. sp. 

 I'l Mi I \\!l. HUB. -*. 



Mitfht li tn -J" mm.: apical alible 53 to 56; volutions about six. This form is 

 represented by six casts of the interior and one macerated testiferous example. In 

 its general aspect it, the cast especially, reminds one greatly of L. concinnula and it 

 is not at all improbable that it is a later variety of that species. Still the testiferous 

 example shows that on the exterior of the shell the spaces separating the upper and 

 lower cariiKi- from the central one are more decidedly concave or groove-like. The 

 -ui face markings also are different, consisting as near as can be made out, of trans- 

 verse lines only. These furthermore are not sharp and equal but consist of more 

 delicate lines with each third or fourth stronger than the others aud sometimes 

 iMm^ui-hahle on the casts. The direction of the lines of growth is about the same 

 in the two species. L. (>i<-i,< '*i Hall has more ventricose whorls, less prominent 

 keels and more equal and sharper surface striae. For comparison with L. perforatn 

 see that species. 



formation and locality. Trenton group, Fuslsplra bed, Wykoff and Fountain, Flllmore county, 

 Minnesota. 



CMtod*Mu.-B. O. r I rk-h: Dr. C. EL Bobbins. 



LOPHOSPIRA QL'ADRISl I.CATA, H. Sp. 

 PLATE LXX1I. FIGS. 10-11. 



Hight 12 to 22 mm.; apical, angle 67 to 70; volutions about six, the last large 

 and ventricose below, quadrisulcate, its upper slope with a strong subcentral carina, 

 dividing two distinctly concave spaces; peripheral angle thick, trilineate; beneath it 

 a wide concave hand, next a sharp carina, then a narrower groove and finally the 

 convex base; umbilicus very small, generally bordered by an obscure ridge. Lines 

 of growth sharp, thread-like, regular, ju-t visible to the unaided eye, curving 

 gently backward on the upper slope, more abruptly bent backward and then 

 forward on the peripheral angle, and nearly vertical between the periphery and the 

 nmbilii 



This beautiful shell, thouul related, is readily distinguished from L. 



Mall, and all other species now referred to Lophospir<i, by having a fourth carina 

 and groove beneath the usual lo\\er carina. The revolving grooves are also deeper, 

 the carinze being more prominent than in that species. The upper one besides is 

 usually further removed from the suture. The lines of growth are precisely the 

 same in the two shells excepting that mi rhe trilineate peripheral hand in /,. <[n<t<lri- 

 they are abruptly curved, while they are straight in L. > 



