i II, OB \'. \ — !• 1.:. W i ! \\r|| 



1 quarter of the fifth whorl in the St. Thibault Bpecimen, the channel 



line-; marking the angular junctions <»i" tl md Binooth 



chann On the lasl pari of the same whorl in the third Bpecimen just 



mentioned, and in tact on the -<■<•■ -mi quarter, even this angularity ha* almost 

 wholly disappeared, the channels being i the keel therefore additionally 



prominent The involution of the last pari of 1 1 » » * fifth whorl covers three fourths 

 of the ng whorl, exclusive of the channel area and the keel, 



which would somewhat increase this amount 



the young of GuibaUanus, our G 



. he was probably mistaken. The specimens in our | 



that this Bpecies bas not been correctly quoted as coming from any other 

 localities than C6te d'Or, 1 1 j » • basin of the Rhone, and perhaps Hierlatz. 



S lures of the first Bpecimen described above <>m the third quarter of the 



fourth whorl had lobes differing from our third to our half, and Baddies al t 



one third; and the third Bpecimen on the first quarter of the fifth whorl had 



me third and saddles a trifle less. The outlines of the Butui 

 siroilai ras. Three - iddles are to bi 



upon the Bide, the inferior laterals being deeper than 1 1 » . - superior laterals, as in 

 other it the first auxiliaries an- unusually large, nearly as deep a< the 



and very broad. The abdominal lobe, a> stated, is from one half 

 to <>ne third longer than the superior lateral-, and the superior lateral saddles 

 third shorter than the inferior laterals. 'There ia therefore no ground 

 for the reference of this species to the genus Amaltheus, as ha- been supposed by 



1 Ippel this Bpecies is found in the Tuberculatus bed, 



ami though Oppel probably never saw a true I this statement is approxi- 



1 > • specimens of ( I were found in 



■<] immediately above the Oxynotus bed, and all of his beds 



the Buckiandi and Davidson i - beds are equivalents of the Birehii 



D'O rials w< re reported as coming 



bul this was evidently considered to be doubtfuj 



pel, even b • I' mortii r found his specimens, 



Th< - figured and described bj Wright from the Oxynotus 



nder the nam' 5 widely distinct The figures of the shell and 



linly taken from n species \\ hich is \ erj 

 . allied with the true! It i- aasuredl^ an Arietian, with affinities 



allying I inn au\ ol 



nvolution, smoothness, form of whorl, and abdomen. The o the i mera- 

 i 



mined \ ei j c irefulh to determine w b< 

 i or hollow, and it was found to be solid. 



\ 'i < , '■ l ■ 



II I 



ench form of thai name I i 



M XXVI., 



