GRAPTOLITES OF AUSTRALIA 
57 
apHni, K. 
chimaera, Y. 
colonus, Y. 
var. compactus, Y. 
comis, Y. 
concinnus, K. 
dubius, Y er. Y. 
exiguus, K. 
fimbriatus, K. 
galaensis, K., Yer. 
griestonensis, Yer.? 
gregarius, K. 
jaculum, K. 
marri, K. Yer. 
melbournensis, Y. 
nilssoni, Y. 
pandus, K. 
priodon, K. Yer. 
romeri, Y. 
sedgwicki, K. 
spiralis var. permensis, K. 
turriculatus, K. 
varians, Y. 
var. pumilus, Y. 
vulgaris var. curtus, Y. 
Retiolites (Cladograptus) geinitzia- 
nus, K. 
Stomatograptus australis, K. 
Numerous plans and sections are published with the paper. 
W. J. Harris (127) erected the new family Isograptidae 
and subdivided it into the genera I sag nipt us (Moberg), 
Oncograptus (T. S. Hall), Cardiograptus (Harris & K.), 
Skiagraptus gen. nov., and Meandrogmptus (Moberg). He 
fixed as the genotype of Isograptus, 1). caduceus (Salter), 
thus conceding prioiity to Salter’s specific name. He pointed 
out that I. caduceus and its allies are “the most easily followed 
of graptolite phylogenetic series and they are the most 
reminiscent of the best-known palaeontological pbylogenies.” 
In the genus Isograptus he places 7. forcipiformis, 1. 
Jinstatus sp. nov., I. manuhriatus (T. S. Hall partim), I. 
dumosus sp. nov., and 7. ovatus (T. S. Hall). The genotype 
of Oncograptus is 0. upsilon, and in this genus he placed 
O. hiangulatus. The genotype of Cardiograptus is C. morsus, 
and in the genus he placed C. crawfordi. The genotype of 
Skiagraptus is D. gnomonicus. The genot^qie of Meandro- 
graptus is M. schmalenseci Moberg, and in this genus he 
placed the Victorian species 17. aggestus and M. tau spp. nov. 
He stated “that unity is given to the whole by progressive 
development along several lines” which he specifies with 
examples, as follows: 
1. The rhabdosome becomes increasingly scandent. 
2. Progression and then regression in the form of the 
thecal aperture. 
3. Concrescence, the more important. 
He commented on the ancestry of Isograptus caduceus. 
published a table showing the stages in the hypothetical 
development of that genotype and allied forms. 
Stage 1 shows a progressive increase in the size ot the 
rhabdosome, accompanied by more open spacing of the 
thecae, angle of divergence, downward direction of apeitiiial 
