BY T. HARVEY JOHNSTON AND B. BUCKLAND TAYLOR. 29 
capture of S. enflata forma minor by the “ Gazelle’ during 
a voyage between the Solomon Islands and Moreton Bay, 
but this record is not sufficiently localised to be regarded as 
Australian. SS. hexaptera is known from New Guinea 
and New Britain (Ritt.-Z. 1909, p. 790), 
We have examined tcw-net material from Moreton 
Bay and Port Jackson, as well as that collected by Pro- 
fessor Haswell, F.R.S., in the s.s. ‘‘ Miner,” in June, 1906, 
at a locality fifty miles E. of Sydney. We take this 
opportunity to express our indebtedness to Professor Has- 
well. 
To the three species of Chaetognatha reported from 
Eastern Australian waters, we are able to add six species 
of Sagitta and one of Spadella. The total number of species 
now known from the Australian coast is as follows : Sagitta 
eleven ; Pterosagitta one; Krohnitta one; Spadella one ; 
total fourteen. 
Under each heading we have mentioned some of the 
outstanding features by which the species may be readily 
determined. A list of measurements is appended, and 
a simple key to the recorded Australian forms, which we 
have found to be of service, has been added for the con- 
venience of Australian students. 
1. S. serratodentata Krohn. 
Syn : Spadella serratodentata Grassi, 1883. 
We have examined a good many specimens of the 
species, and have found a considerable range of variation 
in the number of anterior and posterior teeth, and in the™ 
relative size of the jaws. Our specimens have from 2 to 3 
anterior and 4 to 12 posterior teeth as compared with 8 
to 10 and 17 to 20 respectively, as recorded by Fowler 
(1906, p. 20) and 6 to 9 anterior. 13 to 19 posterior, as 
recorded by Michael (1911. p. 39). The fins of the speci- 
mens were very torn, which probably accounts for the fact 
that we found less than 50% of the posterior fin on the 
body. Michael (1911. p. 39) has referred to the variability 
of this ratio. In a few of our specimens, which were very 
small, being less than 5mm. in length, some of the jaws were 
