TIIIKI'. OB \ ERMICER \N BB \N< II. 1".7 



mi.- li.iv.- reverted to larval outlines. On the eighth whorl tin- lobes are 

 ell of equal length; the superior lateral Baddies, however, are deeper than the 

 inferior laterals, and the first auxiliary saddles aol more than half as deep as the 

 inferior laterals. 



The abdominal lulu- and the larger Baddies are much shallower in proportion 

 to their breadth in this species than in ( I . > t increase in the 



hulk of the whorl by growth i> also less than in < . and the umbilicus 



shallower. The longest living chamber was observed in a specimen in the Museum 



■ It from Vaihingen; it was lull one and a half volutions in length, 

 ninl not complete. Quenstedt 1 figures a Benile specimen with a living chamber, 

 the aperture preserved, which i- a trifle over one and a half volution- in length. 

 The nperture is remarkable for having no lateral Bulcations, ami no abdominal 



m It would be instructive to compare this with the aperture <>t an adult 

 !)l: specimen, since it sujj eneration in the rostrum, and, if this lie 



true, is another characteristic occurring through senile metamorphosis which is 

 analogous t" the younger Bta 



The Museum of Comparative Zoology received in exchange from the Museum 



■ It a young specimen of tin- Bpecies labelled M Arrun. kupteut, Quenst., 

 ! unl Pound with I notm at Nellingi The genicuke hail already 



t.i he developed, ami the presence of a Bubquadragonal form of whorl, as 



well as the keel ami immature channels, at BUch an e.uls age, Bhows that this 



must have been a vermicemn ami not a cal ran Bpecii 



A -: • men from the Arietenkalk in the Museum of Tubingen, anil belonging 



cither to tin- or to ( './/. longidomus, ha- a rupture in tin- -hell at an early age, ami 

 iti'l. The distortion of the spiral is Blight, hut the pilae cross the abdomen, 



which ha- no keel. < >n the first part of the exposed whorl they are mm.- or less 



alternate, hut subsequently quite regular, and on the latter put of this whorl a 

 keel-lil .low. though not high enough to interrupt the pike. 



The ,• mi. 'ii i- about 39 mm. 



Vermiceras Conybeari, ih\rr. 



i \ i i i 



Am*. 



D*0 I'll 



II v 11. |. 10 1 1 



:' ~" 

 I 

 Amm 

 Am 



I 



I 



The th throughout the first volution On thi 



ond whorl scattered folds appear, which develop into true p .ml whorl 



