66 
J. M. Thom sox. 
Caprella penantis Leach 1814 and Caprella scaura Templeton 1836. 
These two forms were common among the algae and have been recorded 
together in the Tables as Caprella spp. Their variability with growth and 
sexual maturity was so great that identification was difficult. From March 
to May C. penantis formed the greater proportion of the catch. Those 
caught in July were entirely C. scaura. 
Mayer (1912) in Fauna S lichees t -A us t ra liens records Metaproto • 
novae -hollandiae , Monoliopus agilis and Caprella aequilibra also from the 
8 wan river. No adult specimens of these species were taken. It is possible 
however that the young of C. aequilibra are included amongst the recorded 
immature forms, since the young of C. scaura and C. penantis develop to a 
considerable size before the frontal spine and other armature appears. 
The Caprellids were among the dominant members of the fauna during 
March and April. Their numbers were reduced by the end of May, and they 
were present in but few numbers in June. They experienced a temporary 
increase in July and then disappeared. Despite the onset of summer condi- 
tions they had not reappeared in collections by 12th of December. 
Distribution: — C. penantis (C. acutifrons) has been recorded from Cler- 
aldton and the Swan River, W.A., South Australia, New South Wales,. 
Mediterranean and North Sea. 
C. scaura from the Swan and at Bunbury, W.A., South Australia,. 
New South Wales, Mediterranean, Rio de Janeiro, Mauritius, Japan, Cali- 
fornia. 
Corophium minor J. M. Thomson. 
It was taken from March to July, and then reappeared in November.. 
It was taken in greatest numbers in late March. In December another 
larger species of Corophium was taken. It has not been identified and is 
recorded here as Corophium sp. 
Erichthonius pugnax Dana 1852. 
Chilton (1922) and others have considered that this and other recorded 
species of Erichthonius are to be referred to one species E. brasiliensis as 
different growth stages. However all the specimens collected which ranged 
from immature forms to ovigerous females and larger males were in close 
agreement with descriptions of E. pugnax. One large male seemed more in 
accord with E. macrodactylus. 
The species is tubieolous, inhabiting tubes built on the algae. These 
tubes are very similar to those of Tanais eavolinii but with a greater pro- 
portion of sand utilised. The species was found only during June and 
July, but during the former month Avas one of the dominant species, at 
least as far as numbers are concerned. As far as I can ascertain this is 
the first record of the genus from Australia. 
Distribution: — New Zealand, Sooloo Sea. 
Melita sp. 
i radically all the specimens recorded under this heading are immature 
specimens. Howe\'er unless a great change occurs in proportion of parts 
such as the very short inner ramus of the third uropod and other character- 
