554 G. C. Crick — On Ammonites calcar. 



V. — Note on Ammonites calcar, Zieten 

 By G. C. Crick, F.G.S., of the Britisli Museum (Natural History). 



IN his work ^ entitled " Die Versteinerungen Wiirtembergs "" 

 C H. V. Zieten figured and briefly described ^ a species under the 

 name Ammonites calcar. The description is as follows : — " Eiicken 

 gewolbt, Euckenlinie spornradformig gezackt ; er hat in dem Bau. 

 seiner Rippen und dem erhohten Saum seiner Windungen grosse 

 Aehnlichkeit mit dem vorhergehenden [i.e. Ammonites bipartitus, 

 Zieten], unterscheidet sich jedoch von ihm sogleich durch seine 

 einfach gezackte Euckenlinie. Aus dem untern Oolith bei 

 Guttenberg." ^ 



In the same work he also figured a species, which he named 

 Ammonites bipartitus * and characterized in the following terms : — 

 " Eiicken flach, Sipho darauf sehr wenig vorstehend, zwischen zwei 

 Eeihen schriig gegen einander iiberstehender Zahne ; die innern 

 Windungen von den ausseren stark bedeckt, deren Mitte auf der 

 Seite durch einen erhohten Saum getheilt scheint, an dessen inneren 

 Seite sich die Eippen einfach in spitzigen Winkeln anlegen, von 

 seiner ausseren Seite dagegen doppelt bis zu den Zahnen seines 

 Eandes hinlaufen. Aus dem untern Oolith unweit Guttenberg." 



In the British Museum (Natural History) collection [Eegister No. 

 37,670] there is an example (see Fig. 1) of Zieten's Ammonites 

 calcar, which bears a label to the following effect in the hand- 

 writing of Dr. Bruckmann, from whom the specimen was obtained : — 

 ^'Ammonites calcar, Benz. -Zieten. Ausserst selten. 1st nach Quenstedt 

 ein kranker bipartitus. Brauner Jura ^, Gamelshausen." On the 

 label there has been written in pencil, in the same handwriting, the 

 letters " [Dr. 0.]," signifying Dr. Oppel, as I have been able ta 

 ascertain from the labels accompanying other specimens in the 



^ This work was issued between 1830 and 1834 in twelve parts of six plates each, 

 as follows : — 



Heft i, 1830, pp. 1-8, pis. i-ri, fide JSTeues Jahrbuch, 1830, p. 404. 



„ ii, 1830, ,, 9-16, ,, vii-xii, ,, „ 1831, p. 336. 



,, iii, 1831, ,, 17-24, ,, xiii-xviii ) ,009 „ ns 



,; iY, i83i; „ 25-32, ,; xix-xxiv j " " ^^^2' p- ^^^- 



,, V, 1832, ,, 33-40, 



„ Ti, 1832, ,, 41-48, 



,, vii, 1832, ,, 49-56, 



,, viii, 1832, ,, 57-64, 



„ ix, 1833, ,, 65-72, 



„ X, 1833, ,, 73-80, 



„ xi, 1833, „ 81-88, 



( „ 89-96 \ I 



„ xii, 1833 ^t^£f pis. Ixvii-lxxii \ " " 1S34, p. 245. 



I pp. 97-102 ) J 



2 Heft iii, 1831, p. 18, pi. xiii, figs. 7r/, l>, c. 



^ Zieten attributes the species to ' Benz.,' but gives no reference to that author. 

 Probably, therefore, Zieten was the first to publish a description of the species, and 

 must be regarded as its author. 



* Heft iii, 1831, p. 18, pi. xiii, figs. Qa, b, c. 



XXy-XXX I jggg JJ1_ 



XXXl-XXXVl ) " ^ 



xxxYii-xm > 1833, p. 244. 



xliii-xlvni I " ' ^ 



idi: } „ „ 1833, p. 624. 



Ixi-lxvi ^ 



