A CRITICAL LIST OF 

 THE SPHOEROSPIRA SECTION OF THERSITES. 



By HUGH FULTON. 

 (Plate i.) 



The collectidns of Dr. James C. Cox of Sydney, and of the late Capt. C. E 

 Beddome, both rich in specimens of this group, having passed through my 

 hands, I have had the opportunit)- of examining many typical specimens, and 

 thought a critical list might be of some service. 



One great difficulty in working out this group has hitherto been the 

 lack of authentic material, so many of the species having been founded 

 upon such slight characters, that without one had for comparison actual 

 t\pes or co-types, it was quite impossible to identify specimens with an)- 

 certaint)- from descriptions. Fortunately, the collections mentioned above 

 contained many co-types, especially of the forms described by John I'razier 

 of Sydney, whose descriptions, often without figures, and very rarely with 

 comparative notes, generally indicate but characters common to the whole 

 group. 



It is probably owing to lack of authentic material at his disposal, that 

 Dr. H. A. Pilsbry's comparatively recent monograph in Tryon's Manual 

 is not up to his usual e.xcellent form ; his division of the section into 

 perforate and imperforate species is not a natural one, for example, 

 amlcr^nni, Cox, occurs both perforate and imperforate, and the same thing 

 occurs in other species of the group. 



In this list I have endeavoured to arrange the various forms according 

 to their relationship and have added notes upon their distinguishing 

 characters. 



I am greatly indebted for valuable assistance to Col. Beddome, Dr. 

 James C. Cox, Chas. Hedley, Esq., John Ponsonby, Esq., and Edgar A. 

 Smith, Es(|. 



Group of inr^'i, Pfr 

 1— T, ineei, Pfr. 

 P.Z.S., 1845, P 126; Cox's Monog. Aust. L. Sh., pi. 5, fig. 5. 

 = rlmlUd. Cox: P.Z.S., 1873, p. 565, pi. 48, fig. 3. 

 = appendinilala, Pfr.: P.Z.S., 1854, p. 149; Cox: Monog. Aast. L 



Sh., pi. 5, fig. II. 

 = fhafrlieri, Cox: P.Z.S., 1870, p. 170, pi. 16, fig. 2. 

 = lianni, Braz. : Proc. Linn. Soc. N.S.^\'. (i), 1876, p. 97. 

 = Ivilli, Braz. : P.Z.S., 1875, p. 32, pi. 4, fig. 3. 

 = jolindonei, Braz. : P.Z.S., 1875, p. 32, pi. 4, fig. 2. 

 - hayensis, Braz. : P.L.S., N.S.W. (i), 1872, p. 2. 

 = jurii^^prwii^io', Cox: Monog. Aust. L. Sh., p. iii, pi 20, fig. 13. 

 Jjir. — Oueensland. 



