70 Ml{. S. S. BTJCKMAN ON [vol. lxxvi, 



presumed to belong to the series allied to JEgoceras obsoletum 

 Blake (11011 SimpsonJ. [See Crucilobiceras crucilobatum S. Buck- 

 man, II, 9, pi. clxxviii, September, 1920. The forms are usually 

 colomorphs of, or aft", this species.] 



Deroceras armatum. I have ventured to translate the species 

 which are recorded under Deroceras as armatoids belonging to a 

 horizon lower than the subplanicosta bed. D. armatum, so far 

 as is known at present, is a species of a horizon above that ; and 

 D. submuticum Dumortier is a species of a still higher level — 

 leckenbyi (Raasayan 7). One may suggest the addition of ' cf.' to 

 the names of the species found by Mr. Richardson. 



I venture to think that the species recorded as Deroceras 

 armatum in connexion with JBifericeras tubellum at Toddington 

 cutting may be different from that in the -pre-subj)lanieosta 

 horizon. And it will be noted that in Table I there is a suspicious 

 gap above Deroceras under Bishop's Cleeve. If these two records 

 could be raised to a -post-ttibellum position the diagram would be 

 much improved. 



Echioceras RARicosTATUM. Here are combined the various 

 records of Echiocerates which presumably require the same addition 

 of 'cf.' 



Oxyxoxiceras guiralianum and sp. I venture to interpret 

 these as belonging to Gleviceras. 1 



Oxyxoxiceras EERRUGiNEUM. This is presumably to be inter- 

 preted as O. jiavum^ (Simpson) homceomorph of Ammonites 

 ferrngineus Simpson, which belongs to the Domerian (about 6, 

 Icevis) and genus Amauroceras. 3 This may possibly indicate the 

 simpsoni horizon. 



Rhynchoxella [rosxellaia (Quenstedt)] is the form which 

 Mr. Richardson has recorded as Mliynclionella sp., so abundant at 

 Toddington. He very kindly gave me some specimens several 

 years ago, but I had not then recognized it. I have also found 

 the species among my father's Cheltenham specimens. Some of 

 the Gloucestershire forms are rather larger than those from 

 Wurtemberg, but otherwise it conforms with Wurtemberg speci- 

 mens kindby sent by Dr. Rau. It belongs to the same limited 

 group as JRh. tlialia (genus Tropiorliynchia S. Buckman) 4 and is a 

 sort of dwarf development of that species. Its presence links the 

 strata of Gloucestershire and Wurtemberg (see p. 72). 



Quenstedt figured Terebratula rostellata as from Lias I (Do- 

 merian), but that is a mistake corrected by Dr. Rau. 5 The label 

 with his specimen is ' Lias y unten.' 



1 II, 8, p. 289. ■ II, 4, No. 55, vol. i, 1912. 



3 II, 4, ii — Systematic, p. vii, 1913 ; II, 9, pi. cxlii. 



4 II, 5, p. 1 ; II, 7, p. 33. 5 XVI, p. 289. 



