138 
Rev. A. M. Norman on two 
lidicola. It is a parasite on the tail of an Annelid belonging 
to the genus Clymene. 
It may be expected that some of the above nine forms will 
ultimately be found to be states of other species. Thus Vogt 
would unite 1,4, and 6 ; whereas Barrois considers 2 and 4 to 
be the same species. 
Genus Tuiticella, Dalyell, 1848. 
Triticella Java, Dalyell. 
1848. TriticellaJlava, Dalyell, Rare and Remarkable Animals of Scot¬ 
land, ii. p. 66, pi. xix. fig-. 1, and pi. xxxvi. fig. 1. 
1873. Triticella Java, G. O. Sars, Christ. Vidensk.-Selsk. Forhand. 
1873, p. 398. 
1873. Triticella Korenii, G. O. Sars, l. c. p. 397, pi. ix. figs. 1-9. 
Thirty years ago Dalyell described the above genus, of 
which he gave rough figures and a brief description. It has 
since remained entirely unnoticed in Great Britain, not being 
so much as inserted in lists of our fauna. In 1873, however, 
Prof. G. O. Sars described two species which he had dis¬ 
covered in the Norwegian fiords, one of which, Triticella 
Bceckii , G. O. Sars, was living on the carapace and legs 
of the crab Geryon tridens , while the other, Triticella 
Korenii , G. O. Sars, had made the carapace of Calocaris 
Macandrewi its home. 
In the summer of 1877 I had the pleasure of rediscovering 
Triticella Jlava in Scotland. When shore-hunting in Kerrera 
Sound, a little to the south of Oban, I procured a specimen 
of the now well-known Cirriped parasite Bacculina carcini , 
attached, as usual, to the tail (pleon) of the common shore- 
crab ( Carcinus mcenas ) ; the posterior part of the Bacculina 
■was subsequently found to be occupied by a colony of the 
long-lost Triticella Jlava —a parasite of a parasite. But Dal¬ 
yell supposed that he had found his species parasitic on an 
Ascidian. We turn to his work; and, behold, what he had 
taken to be an Ascidian, and figured plate xxxvi. fig. 1, is 
manifestly no Ascidian at all, but a veritable Bacculina car¬ 
cini ! At the time when Dalyell wrote, Saccidina had only 
just been described by Vaughan Thompson ; and it is probable 
that our author was unacquainted with Thompson’s paper. 
Now that the secret is out, and when a search is made in the 
right place, Triticella will probably be often met with. 
Those who want to know what this genus is must consult 
Sars’s capital paper, where will be found a detailed description 
illustrated by his usual admirable drawings. I extract here 
his Latin abbreviated characters :— 
