THE INFERIOR OOLITE OP DORSET. 



603 



dually to join the inner whorl. It occurs at Sherborne and Bradford 

 Abbas, but is rare. 



The variety figured by d'Orbigny occurs at Bradford Abbas, but 

 is also rare. 



Haepoceras aeicetjm (Waagen). 



1867. Ammonites adicrus, Waagen, Geogn. Pal. Beitrage, pi. 25. 

 fig. 7. 



Localities. Zone of Harpoceras Sowerbyi at Bradford Abbas, Half- 

 way House, Louse Hill, and many other places ; rather abundant. 

 This species often attains a very large size. 



Dr. Waagen has very properly separated this species from Harpo- 

 ceras Sowerbyi (Miller). It is sometimes rather difficult to separate 

 it from some of the varieties of that species ; but it is really distinct 

 in possessing a small rounded keel, as opposed to the large sharp 

 one of Harp. Sowerbyi, also a larger umbilicus and large distinct ribs, 

 when adult, at a time when Harp. Sowerbyi is smooth. 



Harpoceras pissilobatum (Waagen). 



Ammonites fissilobatus, "Waagen, Geogn. Pal. Beitrage, pi. 27. 

 fig. 1. 



Locality. This species occurs at Sandford-Lane quarry near Sher- 

 borne. I believe it is in the zone of Harpoceras Sowerbyi ; but I 

 have never seen this quarry worked. It is a common fossil there. 



Harpoceras concavtjm (Sow.). 



1812. Ammonites concavus, Sow. Min. Conch, pi. 94. fig. 2. 



1881. A. concavus (Sow.), J. Buckman, " Terminations of Ammo- 

 nites," Quart. Journ. Geol. Soc. vol. xxxvii. p. 60, fig. 1. 



Localities. This species is common in the Sowerbyi zone at Brad- 

 ford Abbas, Halfway House, Sherborne, &c. 



The termination is a curve like an S ; that is, it rises from the 

 inner whorl, curving forward, then rounded and curving back, and 

 then produced on the ventral area. It has no horn, as was sup- 

 posed when it was figured in the Geological Journal. The species 

 that d'Orbigny has figured by this name (Terr. Jurass. pi. 116) 

 does not seem to me at all to agree with Sowerby's figure. 



Harpoceras MiJRCHisoNiE (Sow.). 



1829. Ammonites Murchisonce, Sow. Min. Conch, tab. 550. 

 1825. A. corrugatus, Sow.? Min. Conch, tab. 451. fig. 3. 



1830. A. Murchisonce (Sow.), Zieten, Verstein. Wiirttemb. tab. vi. 

 1845. A. Murchisonce (Sow.)?, d'Orb. Terr. Jurass. pi. 120. figs. 1, 



2, 3, var. ? 



1854. A. Murchisonce (Sow.), Morris, Catalogue, p. 293. 

 1856. A. Murchisonce (Sow.), Oppel, p. 368, no. 18. 

 1867. A. Murchisonce (Sow.), Waagen, Geogn. Pal. Beitrage, p. (92) 

 598, § 31. 



1878. Ludwigia Murchisonce (Sow.), Bayle, Carte. Geolog. de la 

 France, pi. 85. 



