cxciv INFERIOR OOLITE AMMONITES. 



The present is most likely the more correct position — at any rate, it belongs to 

 the Sonnininae. Since it was described I have been able to work certain disused 

 quarries around Sherborne, and I can therefore judge that the horizon of this 

 species is probably Witchellia beds, certainly not Murchisonse or Goncavus beds. 

 See Baj. Sherborne Disk, Quart. Journ. Greol. Soc, vol. xlix, p. 480. 



Family— OPPELULE. 



Genus— (Ecotraustes, Waagen. 



(Type : (Ecotraustes genicularis, Waageu.) 

 1869. Oekotraustes, Waagen, Formenreihe Am. subradiatus ; Geol. Pal. Beitrage, 

 Bd. ii, Heft ii, p. 251. Spelt " Oecotraustes " in 

 explanation of Plates. 

 (Ecotraustes, auct. 



That the Hectici were related to Ludwigia was the opinion of several palaeonto- 

 logists. The species called (Ecotraustes were figured in Plates XX, XXI as being- 

 related to the Hectici, which is perhaps correct, and hence to Ludwigia. But 

 before they were described the Ludwigia connexion was seen to be untenable; 

 these species belonged to the Oppelidae, though the idea that the Hectici were 

 related to Ludwigia was still clung to. Bonarelli, however, considers that the 

 Hectici belong to the Oppelidae, and that seems to be most likely. 



As the specimens of (Ecotraustes that happened to be figured have not been 

 described in the body of the work, it is advisable to consider them here. 



(Ecotraustes rugosus, S. Buchnan. Plate XXI, figs. 1, 2. Suppl., Fig. 189, p. cxcvi. 

 1889. (Ecotraustes rugosus, This Monogr., PI. xxi, figs. 1, 2. 



Description. — Subplatysubleptogyral ; subangustumbilicate ; costate ; periphery 

 subconvex, parvicarinate. 



Note. — Plain costate stage until 29 mm. diameter, then begins a stage with 

 nodate-ended costae. 



Locality and Stratum. — Somerset : East Coker, from the upper beds. 



Date of Existence. — Probably hemera Truellii. 



(Ecotraustes costiger, S. Buchnan. Plate XX, figs. 15 — 17. Suppl., Fig. 190,p. cxcvi. 

 1889. (Ecotraustes oonjungens, This Monogr., PI. xx, figs. 15 — 17. 

 Description. — Platysubleptogyral; excentrumbilicate ; parvicostate, costae quite 



