ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 251 
the determination of the species rests upon the authority of the naturalist 
whose name follows the quotation. 
1861. Mr. Jeffreys, Mr. Waller, and myself. The dredging this year was 
chiefly carried on from the Whalsey Skerries, where the Lighthouse was 
made our headquarters; but a short cruise was taken, just before the home- 
ward voyage, to the ground to the north of Unst, which in later years 
proved so productive. Vessel, the yacht ‘ Osprey.’ 
1862. Mr. Jeffreys and Professor Allman. The expedition came to a pre- 
mature and unfortunate termination. The vessel which had been chartered, 
haying been caught in a heavy gale at sea, had her rudder-post carried 
away, and thus became disabled. Professor Allman, however, succeeded in 
procuring several Hydrozoa new to science. 
1863. Mr. Jeffreys, Mr. Waller, Mr. R. Dawson, and myself. A steamer 
was this year engaged in the work, and the dredging was in the directions 
north, north-east, and east of Unst. 
1864. Mr. Jeffreys, Mr. Waller, and Mr. Peach. The dredging was chiefly 
carried on to the north of Unst, Balta Sound being made the headquarters 
during the greater portion of the summer. Mr. Peach paid special attention 
to the sponges, and discovered several new species. Vessel, the ‘ Osprey.’ 
1867. Mr. Jeffreys, Mr. Waller, Mr. Dodd, and myself. The bed of the 
ocean, to the north and west of Shetland, was investigated, and at greater 
depths than had before been tried. A fortnight was also spent in examin- 
ing the rich fauna of the deeper parts of St. Magnus Bay. Vessel, Mr. 
Jeffreys’s yacht the ‘ Osprey.’ 
1868. Mr. Jeffreys, Mr. Waller, and Major Woodall. Dredging chiefly 
to the north of Unst and St. Magnus Bay, but the Out Skerries Haaf was 
also yisited. Vessel, the ‘ Osprey.’ 
My sincere thanks are especially due to my kind and valued friends Mr. 
Jeffreys and Mr. Waller, for the assistance they rendered me in all kinds of 
ways during our dredging operations, and in the preservation of those inyer- 
tebrata which it is my duty here to notice. 
In 1867 Mr. D. Robertson went to Shetland, and, besides dredging and 
using the towing-net in Bressay Sound, he visited many of the inland lochs 
and streams, for the purpose of examining the Crustacea which they might 
contain, I have to thank him for haying kindly allowed me to examine 
the gatherings which he made, and I am thus enabled to add many species 
to the list of Entomostraca, 
In the preparation of the Tables which follow, it must be understood 
that I have not relied solely on published localities. A large number of the » 
species have been identified by myself from habitats further to the north or 
to the south than those which have been recorded in print. This will 
account for the absence of many names from the Tables IV., V., and VII. 
which might have been expected there. 
i 
Comparison of the Total Number of British and of Shetland Species. 
The following Table is intended to show— 
1. The number of species belonging to the several Classes and Orders, as 
given in the “ List of the British Marine Invertebrate Fauna,” published by 
the British Association in 1861, and which supplies us with a carefully cor- | 
rected catalogue of the species known seven years ago. 
2. The total number of species which have been Tecorded as British up to 
the time of publication of this Report. This estimate I have own up 
a 
