34 
F.C. Holmes 
adjacent interambulacra, reaching a maximum depth of 3 mm 
(5.2%TL) below the anterior ambitus. Pore pairs are visible 
adapically between the ocular plate and approximately one- 
third of the radius to the anterior ambitus. Adapically, the pore 
pairs are angled inwards at approximately 45° to the perradial 
suture but gradually become monoserial halfway towards the 
anterior ambitus. The ambulacrum is covered with closely 
spaced small tubercles and miliary granules, the former 
gradually increasing in diameter adorally. 
Peristome reniform and slightly sunken, longitudinal 
dimension 4 mm (6.9%TL), width 8.6 mm (14.8%TL), anterior 
edge situated 12.4 mm (21.4% TL) from ambitus. Phyllodes 
unipored with periporal areas protuberant. Basicoronal plates 
amphiplaceous. 
Labrum small, wider than long, covered with small 
tubercles and flared anteriorly where bordered by a smooth 
raised rim (fig. 3H). Curved anterior edge projects over the 
peristome for about one-third of the latter’s length. Posterior 
edge does not extend beyond the first adjacent ambulacral 
plates. Plastron wide, long, and covered with rows of closely 
spaced angular tubercles without interstices. Maximum width 
of plastron (45%TW) occurs about three-quarters of the test 
length from the anterior ambitus. 
Periproct elliptical shaped with slightly pointed upper and 
lower junction with interradial suture, height 8.0 mm 
(13.8%TL), width 5.0 mm (5.6%TL). Underside of vertical 
opening situated high above base of test (44.2%TH) on 
truncated posterior surface. Subanal surface slightly depressed. 
Etymology. Named for Janice Krause of Hamilton, Victoria, an 
exceptionally dedicated fossil echinoid collector. 
Remarks. Comparison of Peribrissus janiceae sp. nov. with the 
type species P. saheliensis from Algeria and P. sotgiai from 
Sardinia is complicated by the lack of detailed descriptions, 
comparative measurements and illustrations of many of the 
important diagnostic features of the latter two species. The 
difficulty is compounded by the excellent preservation of detail 
found on the single specimen of P. janiceae and the large 
difference in size between specimens of the three species, with 
P. saheliensis approximately twice the length and width of P. 
janiceae and four times that of P. sotgiai. Where possible, 
diagnostic features of the three species are compared in table 1, 
based on the descriptions of Pomel (1887), Giorgio (1923) and 
Stefanini (1911), together with approximate measurements 
taken from their illustrations of the partial and poorly preserved 
type specimens. 
Acknowledgements 
I am indebted to Christopher Ah Yee and Janice Krause 
(Hamilton, Victoria) for collecting and donating the holotype, 
and to David Holloway (Invertebrate Palaeontology, Museum 
Victoria) for valuable advice and support during the 
preparation of this manuscript. Kenneth McNamara 
(Department of Earth Sciences, Cambridge University) and 
Andrew Smith (Department of Palaeontology, Natural History 
Museum, London) are thanked for suggesting improvements 
to the manuscript. Peter Aucote of Sunlands, South Australia, 
kindly gave approval to collect on his property and Museum 
Victoria Library staff and Eric Poirot (www.echinologia.com) 
were extremely helpful in obtaining references. Michael Gatt 
(Rabat, Malta) is also thanked for providing photographs for 
comparative purposes. 
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