DEPARTMENT OF GEOLOGY. 83 



The Mesozoic and Tertiary Gastropoda and Lamellibranchia 

 registered, labelled, and incorporated, include : — British Jurassic and 

 Cretaceous specimens (J. W. Butler coll.) ; Post-pliocene marine 

 shells from Ayrshire (John Smith coll.) ; Tertiary Mollusca from 

 Australia (J. H. Young coll.) ; New Zealand Tertiary Mollusca 

 (Geological Survey of New Zealand) ; Cretaceous Mollusca from 

 Africa (Angola) (J. W. Gregory coll.), described by R. Bullen 

 Newton, Trans. Roy. Soc. Edinburgh, 1916, vol. li., part 3 (No. 15), 

 pp. 561-580, pis. i., ii. ; and natural casts of British Lower Green- 

 sand (Aptian) Lamellibranchia (R. Broom coll.). 



Number of Mollusca registered : — Cephalopoda, 947 ; Gastro- 

 poda, 294 : Lamellibranchia, 494. Total, 1,735. 



Arthropoda (Gallery 8 and Workroom). — The acquisitions 

 registered, labelled, and incorporated include : — Devonian and Car- 

 boniferous trilobites from Devonshire (J. G. Hamling coll.) ; various 

 groups from the Coal Measures of Coseley, Staffs. (S. Priest coll.) ; 

 and insects in amber and gum copal transferred from the Zoological 

 Department. 



The large collection of Arthro})ods, mainly insects, from the 

 Bembridge beds of Gurnet Bay, has been sorted into Orders. 



Number of specimens of Arthropoda registered, 1,148. 



Ecliinoderma (Gallery 8). — The acquisitions registered, labelled, 

 and incorporated include : — Ashgillian Cystoids from the Lake 

 District (Marr coll.) ; Silurian Stephanocrinus from Canada and 

 Tennessee (Parks and Foerste colls.) ; Crinoids from the Chouteau, 

 Keokuk, and St. Louis Limestones of Missouri, Illinois, and Iowa 

 (Greger and Worthen colls.) ; from the Mesozoic rocks of England 

 (Mockler coll.) ; Blastoids from the Chouteau and Keokuk Lime- 

 stones of Missouri (Greger coll.) ; Echinoids from the Jurassic of 

 Dorset (J. W. Butler coll.) and the Tertiary of Portuguese East 

 Africa (Thiele and Wilson coll.) ; Asteroids from the Mesozoic of 

 England (Mockler coll.) and Bohemia (Fritsch coll.). 



In the exhibited series the chief accessions are : — A Melocrinus 

 gregeri (see Donations) and a Stereocidaris merceyi with apical 

 system in place. Various specimens from the Pliensbachian of 

 Mickleton tunnel have been re-mounted and re-labelled. 



The collections of Agaricocrinus and Dorycrinus from North 

 America, and of the Cidarids from the Hartwell Clay, have been 

 revised and relabelled. 



The slip-catalogues of exhibited specimens, of specimens of 

 Blastoidea, and of genera and species of other Classes, have been 

 continued. 



Number of specimens of Ecliinoderma registered : — Echinoidea, 

 121 ; Stelliformia, 95 ; Crinoidea, 274 ; Blastoidea, 58 ; Cystoidea 

 and Edrioasteroidea, 24. Total, 572. 



Annelida (Gallery 8 and Workroom). — The acquisitions regis- 

 tered, labelled, and incorporated unclude specimens from the 



