J. W. Jachson — MoUusca, Coal-measures, Lancashire. 449 



9. That only in the Orthopoda high specialization of the pelvis had 

 been obtained. 



10. That the pelvis of Triceratops and Stegosauria^\iow Siu. incipient 

 stage towards bipedal progression and not a secondary return to 

 quadrupedal habits. 



V. — Pal^ontological Notes feom the Manchester Museum : 

 On Mollusca fkom the Lancashire Coal-measures. 



By J. Wilfrid Jackson, F.G.S., Assistant Keeper, Manchester Museum. 



I IT re-arranging the large collection of Coal-measure fossils in the 

 Manchester Museum I have had occasion to revise a number of 

 species (notably in the Wild Collection) which have been recorded 

 in the past under determinations which are now obsolete or erroneous. 

 The object of this communication is to give a few critical remarks 

 on these, as well as to place on record several hitherto unrecorded 

 forms from the Lancashire Coal-field. 



Cephalopoda. — The Nautiloid section of this class has already 

 received some attention at the hands of Dr. W. Hind [l]/ with the 

 result that three new Lower Coal-measure forms have been discovered 

 and some of Wild's former incorrect identifications rectified. 

 Particulars of these will be found in Dr. Hind's paper ; it will 

 therefore be unnecessary to deal with them again here. 



Two further Nautiloids, not dealt with by Dr. Hind, were also 

 figured by Wild, from the Lower Coal-measures, in his paper [2]. 

 These were given in his " lleference to the Plates" as '■^Nautilus 

 temnocheilus [pi. i, figs. 2 and 3]. Eoof of the Bullion Coal, Carre 

 Heys, Colne ", and '■^Nautilus subsulcatus, Salter [pi. ii, fig. 5; 

 pi. iii, fig. 3]. Eoof of the Bullion Coal, Townhouse, near Colne ". 

 JN^o descriptions, however, accompanied the figures. Both these 

 specimens are now in the Wild Collection (M.M.), and I have recently 

 carefully examined them. One of the two examples referred, to, 

 " N. tevinocheilus " (Wild's fig. 2), is a young shell consisting of one 

 or two inner whorls displaying the sutures ; this appears to be 

 referable to Solenocheilus cyclostomus (Phil.), in which Dr. Hind 

 agrees with me. The original of Wild's fig. 3, which is only a 

 fragment of a whorl, together with another similar example in the 

 Kay- Shuttle worth Collection (M.M.), are also to be referred to Phillips' 

 species. With regard to ^' Nautilus suhsulcatus'", this has proved on 

 critical examination to be an entirely new species of Temnocheilus. 



Mr. H. Bolton, in his PalcBontology of the Lancashire Coal-measures 

 [3, p. 394] (compiled mainly from material in the Manchester Museum), 

 givesalistofl^autiloid forms in the Lower Coal-measures as follows: 

 Ephippioceras costatmn, E. clitellarium, Coelonautilus sziisulcatus, 

 C. quadratus, Fleiironatctilus falcatus, Temnocheilus concavus, and 

 T. chrhonarius, stating that he believes examples of most of these 

 species are in the Manchester Museum. The Museum, however, does 

 not appear to possess authentic examples of anj" of these species from 

 the Lancashire Coal-field, but E. clitellariiim is represented by some 



^ These numbers refer to the bibliography at end of paper. 

 decade v. — VOL. IX. — NO. X. 29 



