cw) 
52 REPORT—1868. 
with great care. In the second column many species are omitted which, 
though contained in the first, are not considered by me to be distinct from 
other described species; consequently the difference between the number 
of British species now known, and those which had been recognized previ- 
ously to 1861, is even greater than appears from a comparison of the figures 
here inserted. 
3. The number of species which have been found in the Shetland seas. 
The inland forms are entirely omitted from these columns. The small area of 
the Shetland Islands, their isolation, the stunted character of the vegetation, 
the almost total absence of trees, and the scarcity of ponds or pieces of 
water other than moorland tarns (which character of water has a restricted 
fauna peculiarly its own), all tend to limit the numbers of land and fresh- 
water invertebrata likely to be found in the islands. Our object was the 
investigation of the marine fauna, and but little attention was paid to that 
of the land. ‘Those few species, however, which were observed will be found 
enumerated in the Catalogue, and consist of twenty-two Crustacea (out of 
one hundred an fifteen known as British) and one Hydrozoon. 
I. Il. Ill. 
British, | British 
in 1861. | in 1868, | Shetland. 
ie ae ROMO O00 Sil 4] 40 18 
TACO MUTE, Seo aaa oc 14 15 11 
| UES, Pupo nado ood 52 55 26 
os MtOMAPOdA 2 wees oo 23 40 23 
a PATHIP HPO Heels olaye le olereene 120 185 nT 
<4 a 
S | Crustacea 4 Betopode I 8 | 8 | a pe 
F Cladocera vi .c sii. ce 1 2 2 
a Ostracoda ey. simiaew sj. 21 124 87 
< Copepoda ............ 50 87 51 
Cirripediaatenniiie iis: 27 25 6 
Pycnogonoidea ........ 11 25(P) 6 
Arachnida, Acayina .......0.00005 0 9 2 
ini carta," Se they sneeaetere 73 104 39 
a Cheilostomata ........ 110 153 102 
RA} Cyclostomata.......... 24 25 21 
36 | Polyzoa ..< Ctenostomata.......... 24 28 10 -137 
so ‘| Pedicellinea ........+. 3 3 Cea | 
I (Moplopea) ye -iweactexierie ies 0 1 1s et 
iat ( Holothuroidea ,....... 24 20 14 ag 
Ss | HICHINOIGER s,s cine oie 15 16 15 ( 
a cree eee + Asteroidea .......5...> 16 18 17 62 
5 & | | Ophiuroidea 111210000: 14 16 14a 
pale =p UCrinoidea .........06- 3 4 pac 
ae IO Gr Semin oon . 74 21 
< Bt, fs AU GVONATIANS yreieyel er sielols 1 15 Uf 
| Actinozoa . Ctenophora...... Seer a Gk 11 1 34 
= Lucernariada .......... 13 14 5 
5 eeaphore jae es "hie oie'sa\|) 02 92 52 
| [ PATHE CHB mete bhh s cioves stats 36 72 26 | 
3 Hydrozoa .2 coerce Medusze ” 69 69 24 +104 
iS) | Calycophorida ........ 1 1 1 | 
le Physophorida.......... 3 a Le 
$s Calcaxeaie tii as a‘scas nie 10 12 5 
Bua) LOPEtera. sa ieem Smear teh winners & 101 177 73 83 
Ae IKGPDEOSB, Mice cote ete ais 10 12 5 
