DISTRIBUTION OF GRAPTOLITID^. 375 



The next clearly-marked zone above these is well shown at the 

 head of Victoria Gully, and is characterised by the great abundance 

 of Didymograjitus caduceus and Phyllograptus typus. This is seen 

 to be overlain by a set of beds containing D. caduceus in still 

 greater relative abundance, but without Phylloyraptus. These two 

 zones occur repeatedly over the field, both east and west of Wattle 

 Gully, and are readily distinguished, as Phylloyraptus if present is 

 quickly found, as, owing to the broad extent of its surface, it is 

 easily displayed, even in badly cleaved beds. 



Loyanoyraptus Loyani occurs somewhere near this last zone, but 

 I have onlv a single fragment from a " mullock -heap " in a dis- 

 .turbed locality. Professor M'Coy says it is abundant at one 

 locality here, but I am afraid the spot is built over, and I camiot, 

 therefore, state definitely where it comes in. 



Taking the fauna as a whole, we have, in the highest beds I 

 have examined, what is apparently a 2Ionoyraptus, represented at 

 present by only a single specimen, and related closely to M. Nils- 

 som\ the sole difference apparently being the much smaller number 

 of hydrothecse. Didymoyraptiis is represented altogether by 

 about six species, D. caduceus being taken as a true species. 

 Tetrayraptus has three species, two (T. quadribrachiatus and 

 T. bryonoidesj ranging throvighout, and the latter attaining a larger 

 size in the uppermost beds. The third species, T. jruticosus, is 

 confined to the lowest rocks. Dichoyraptus has two species, I 

 think — D. octohrachiatus and D. octonarms. Gonioyraptus is repre- 

 sented bv two species, G. Thureaui being confined to the lowest 

 one, while the other species has a more extended range. Temno- 

 yraptus has one species at any rate, though, perhaps, some of the 

 fragments I have may be distinct. It ranges widely. Two species 

 of Diployraptus occur, D. mticronatus being very common in the 

 highest zone. Pliylloyraptus is represented by perhaps two 

 species, but more specimens of the doubtful form are required. 

 hendroyraptus is fairly common, and I do not know hoAV many 

 species may be claimed. D. diver yens is one, while another closely 

 resembles D. fiexilis. Thamnoyraptus typus occurs in the lowest 

 zone. 



The only other fossils found comprise a single spicule of a 

 silicious sponge and Linyulocaris M' Coyi (Eth. Jim.), which is 

 abundant throughout. Other species of allied crustaceans occur, 

 but are always very obscure. 



It is interesting to note that the line of strike of the lowest 

 zone passes through what was the richest reefing country in the 

 field. Mr. E. J. Dunn states that the central area of Bendigo is 

 occupied by the lowest rocks exjjosed, and that where the beds 

 crop out most gold is obtained. 



