410 
CRUSTACEA. 
and July. M. Edwards indicates this species merely as found in the gills 
of a salmon. C. vespa was noticed this year for the first time as found on 
the English coast. See British Museum Crust., p. 118. 
C. curtus, Kroyer. 
On Raia maculata taken in Belfast Bay, April, 1839, W. T. 
C. rapax, Edw. 
C. sturionis, Kroyer, 
I obtained on Trigla hirundo and T. pini brought to Belfast market in 
November, 1839. 
C. Nordmanni, Edw. 
I took several specimens of this fine Caligus alive on a sun-fish ( Or- 
thagoriscus mold) captured on the coast of Antrim in September, 1848. 
They were all adherent externally to the skin of the fish on different 
parts of the body. When living they were marbled over with greyish 
lilac of dark and light shades. This species was erroneously included in 
a paper published in the 20th vol. of the Annals, p. 248. The name C. 
Mulleri being substituted there for C. Nordmanni will make all correct. 
Two others noticed in the same page require the following correction, 
according to Dr. Baird, who then kindly assisted in determining them, 
but has since given the subject a more rigid examination. 
C. pectoralis, Kroyer. 
M. Edwards notices this as found on turbot, plaice, and other flat-fishes 
(vol. iii. p. 454). I have procured it on Platessa Jlesus , P. limanda, Solea 
vulgaris , Scomber scombrus, Zeusfaber, and Conger vulgaris , brought to 
Belfast market in March, 1837 : they adhered to all the exposed parts of 
the body of the various fishes, and not to the gills, &c. 
Genus Trebius. 
T. caudatus, Kroyer. 
This truly generic form was obtained by Kroyer on a Squalus galeus 
taken in the Kattegat. My specimens — both male and female — were 
found adhering externally over both sides of the body of a Raia batis 
captured in Belfast Bay in September, 1838. 
Genus Cecrops. 
C. Latreilleii , Leach. 
South of Ireland, J. V. Thompson. 
On Orthagoriscus Mola, taken at Dublin, Dr. Ball. Cork, Prof. Allman. 
On the same from Antrim coast.* 
Genus Dichelestion. 
Z>. sturionis, Edw. 
South of Ireland, J. V. Thompson. 
* On Orthagoriscus Mola, Belfast Bay, 1852 . — Ed. 
