Blchicebas (Si'Henodiscus) Belviderensis. 2i) 



occurring in No. 5 of my Blue Cut Mound section (tiie Ful- 

 lington horizon of the Kiowa shales). The specimens so 

 recorded were small ones, of which the drawings were made 

 in 1889, and published, without comment, in 189-4.* They 

 were assigned a specitic name because smaller, plainer and 

 simpler-sutured than those recorded in 1889 and 1890 as 

 ^'Ammonites pedcrmiUs''^ from the Chamijion shell-bed; f 

 but the Fullington and Champion forms are now regarded as 

 belonging to one variable species, which must, therefore, take 

 the name belviderei, or its modified form, helvklerensis. 



Of this species there appear to be five varieties that call 

 for notice. These may be described as follows: 



Var. MONS-COMANCHEANUS. 

 Plate I, Ar. ■). 



Suture relatively complex for this species, having even 

 the smaller leaves more or less cut at the summit, usually 

 with two or three simple, obtuse lobules, and the larger leaves 

 cleft into a larger number (4 — G) of processes which are 

 either simple and short (tooth-like) to somewhat longer (sub- 

 digitiform), or show a tendency to secondary toothing, one 

 or two of the processes being expanded at the extremity and 

 abruptly truncated or notched. Of the saddles centripetally 

 succeeding the five secondary saddles,^; the first three are 

 simple and subrotund (the first one a little compressed), with 

 rounded to truncate extremity, the next two (respectively 

 just outside of and opposite the circum-umbilical tubercles) 

 are broader than deep and strongly emarginate or bilobate, 

 being parted into two lobes by a small and short clavate leafiet. 

 The type is from the Comanche Peak limestone of Tarrant 

 County, Texas; and to this variety the connnon Sphenodiscus 

 of the Champion shell-bed (illustrated in figures 1 and 2 of 

 Plate I) seems to belong. 



♦Now and Littlo Known Invertebrata from tli(> Ni>oconiiaii of Kansias. Aniori- 

 can Geologist, XIV, Plato I, Aks. W-U. July, 1894. 



tQooloKical Notoson tho Ropion South of the Groat Bond of the Arkansas. Rul. 

 Washb. Coll. Lab. Nat. Hist., No. y, Fobrr.ary, ISSil; and, On the Choyenno Saudstono 

 and tho Neocoiuian Shales of Kansas. L. C. No. 11. 



X 1 lie term " secon<lary saddles " is used as a convenient desiRnation for tlie five 

 saddles into which, by foliolation, the external saddle of typical Buchiceraa is sub- 

 divided in UphenoUiscuii. 



