SCH LOTH EI MIAN BRANCH. 129 



Sihlotheimia catcnata, w tram. 



Minim. PL Kl I .- 



Awm 



- 



- 

 Am i •--! . Iliiil.. pi. ii tig. 10, II. 



Amm. angulatus h Hi 12. 



.•Inn*, on;/'.' ',' KNS1 . Ibid . 



;. 



Nil m . [bid 



mg, MoblhtoseD, < 



In the collection of the Museum of Stuttgard 1 from the Planorhis bed there 



ipecimen of thi- species, which i- more discoidal than Sehht. angulata, and 



like Waehneroceras in its aspect than any other members of this Beries, and 



rvable in Quenstedt's collection. In the collection at 



Semur there are three specimens from the Planorbis bed correctly named <-,,■. 



l ire not large, and one Bpecimen ai the diameter of 52 mm. shows signs of 



old age in its obsolescing pike and Bmooth abdomen. We have also examined 



D'Orbigny's types and confirmed these comparisons. Neumayr compares bis 



ten from the Planorbis bed of Pfonsjoch with the North German Bpecies of 



. and in Professor Emerson's collection from 



dendorf, now ;it Amhi ill specimens of tb very 



closely with as figured l>\ Quenstedt. The pilae cm— the abdomen with 



:i forward bend, but in one precisely the peculiarities of Quenstedt's Fig 12 



ichibited, 1 1 » * - pilae being is they cross the abdomen. 



11 • n-t , in.i\ be .i large variety ; the whorl as figured resembles tl 



Bohlothelmia BtriatiMimA, Hyatt. 



s 



ea in the Museum of Comparativi nnd 



11 riptions and figures show thai it is ;i discoidal shell lik< 



but the abdomen is narrower, the whorl more compressed, and the pilae more 

 numerous and finer than in thai mind one in this ol the 



s, Init unfortunately there are no transitional modifications by 

 which tn follow out the connection, it it existed, \sitli th< d forms of the 



( »w a. The mould of thi Quenstedt to 



