CETACEA. 81 



four "from the Coralline Crag of Beccles Old Abbey, Suffolk," in 

 the British Museum* (No. 30,265), have yet to be identified or 

 described. Mr. Lydekker (Quart. Journ. Geol. Soc., Vol. XLIIL, 

 p. 16, 1887, and Cat. Fos?. Mamm. Brit. Mus. Part v., p. 84, 

 1887) in speaking of these undetermined specimens says they 

 " indicate a Dolphin agreeing in size with the existing Lageno- 

 rhynchus acutus .... and may be identical with one 

 or both of two Belgian species to which Prof. Van Beneden has 

 applied the name of Delphinus Wasii and D. Delannoyi (the 

 generic term being used in a wide sense). The specimens in the 

 Brussels Museum do not, however, include any examples of the 

 periotic, so that I could not institute any comparison between 

 the Belgian and the English specimens." Among the examples 

 of unnamed periotics in the Museum of Practical Geology I recog- 

 nize three forms which appear to represent three distinct species ; 

 one of these (Plate VIII., fig. 11) has the anterior foramen of the 

 inner side included in the large fossa above the cochlea, and 

 together they form an elongated oblique depression placed nearly 

 horizontally and the articular surface for the tympanic is broad 

 and concave. These may be young examples of Globicephalus 

 uncidens. The second form of periotic (Plate VI II., fig. 10) has, 

 in most cases the anterior inner foramen distinct from the 

 supra-cochlea fossa, but when they are united the depression is 

 more nearly vertical than in the previous form, though still 

 oblique ; and the tympanic articulation is more elongated and less 

 concave or even inflated. This is the form figured by Prof. 

 Lankester (Ann. Mag. Nat. Hist. Ser. 3, Vol. XIV., Plate viii., 

 figs. 2, 3, 1864) and provisionally included in his Delphinus unci- 

 dens. (See p. 77.) The third form of periotic (Plate VIII., 

 fig. 12), has the elongated supra-cochlea depression nearly hori- 

 zontal as in the first form, and the tympanic articulation elongated 

 and inflated as in the second form. 



Another large periotic in the Museum of Practical Geology 

 from the Red Crag Nodule-bed of Woodbridge (Plate VIII., 

 fig. 9) has yet to be generically determined. Fig. 13 on same 

 plate is an undetermined tympanic. 



Two small delphinoid vertebrae from the Norwich Crag, Wigham 

 Collection, are preserved in the British Museum (33,504, 33,505) 

 (Cat. Foss. Mamm. Part v., p. 83, 1887). 



* There is some error as to the horizon and locality of these specimens, which 

 were purchased by the British Museum in 1855 from Mrs. Nixon, for there seems 

 to be no such place as Beccles Old Abbey, Suffolk ; and the Coralline Crag does 

 not occur near Beccles. It has been suggested that " Leiston Old Abbey " is the 

 place meant, but there is no outcrop of Coralline Crag within three or four miles. 

 Red Crag occurs near Leiston, but the specimens are not hard and phospbatised 

 like specimens from the Nodule-bed, and it is unlikely that four specimens like this 

 should be found in the Ked Crag proper. 



o 63855 



