470 Part I1.—Twentieth Annnal Report 
Dr. Giesbrecht, in his great work on the Pelagic Copepoda of the Gulf 
of Naples, seems to be in doubt as to whether the Forth specimens con- 
sidered by Mr. Bourne as belonging to the- Monstrilla helgolandica, 
Claus, can really be identical with that species, and is rather inclined to 
ascribe them to his MW, longiremis; the chief difficulty in the way of 
accepting this conclusion, however, is that Bourne, in describing the 
specimens, states that they possessed six furcal sets, whereas in MM, 
longiremis there are only five; unfortunately the mounted preparations 
from which the original description and figures were prepared were acci- 
dentally destroyed, and I am therefore unable to throw any light on the 
subject ; but the occurrence of the specimen of Monstrilla longiremis just 
recorded seems to lend some support to the doubt expressed by Dr. 
Giesbrecht. Moreover it is interesting to note that none of the species 
mentioned by Mr. Bourne appear to have been provided with five furcal 
setae, the number observed being either three or six. 
Thaumaleus thompsont, Giesb. Pl. XXV., figs. 5, 6. 
1892, Thaumaleus thompsoni, Pelagischen Copepoden des Golfes 
von Neapel, p. 584, pl. 46, figs. 7, 27, 31, 36, 40. 
A male specimen of a Copepod, which is apparently identical with 
Thaumaleus thompsont, Giesbrecht, was obtained in a tow-net gathering 
collected in Lerwick Harbour, Shetland, on October 15th, 1901. In the 
male of this species the first of the two abdominal somites is shorter than 
the second, while in the female the first abdominal seement is, according 
to Dr. Giesbrecht, distinctly more dilated than the other. The caudal 
furea in the male are each provided with three sete (fig. 5), but the 
female, according to Giesbrecht, has four. 
One of the more obvious differences between the genus Thaumaleus 
and Monstrilla is that in the first the abdomen is composed of not more 
than two segments, exclusive of the caudal furca, whereas in Monstrilla 
the abdomen is composed of three, and sometimes of four, segments. 
Moreover, in Thaumaleus the number of hairs on the caudal furea is 
usually three or four, while Monsérilla, on the other hand, is provided with 
five or six furcal sete. 
LICHOMOLGID. 
Lichomolgus furcillatus, Thorell. 
This species was obtained in the washings of some dredged material 
collected at the north end of Inchkeith on May 23rd, 1901. 
Lichomolgus hirsutipes, T. Scott. 
1893. Lichomolgus hirsutipes, T. Scott, 11th Ann. Rept. of the 
Fishery Board for Scotland, pt. i., p. 206, pl. iv., figs. 
1-12. 2 
This was dredged off the North Craig, Firth of Forth, on July 4th, 
1901; the species was described from specimens collected in the vicinity 
of the Bass Rock at the mouth of the estuary in 1893 ; it appears to be 
a rare species. 
Pseudanthessius liber (Brady and Robertson). 
1875. Lichomolgus liber, B. and R., Brit. Assoc. Report, p. 197. 
This species was obtained in the same gathering with the last. It 
appears to be a more common and more widely distributed species than 
Lichomolgus hirsutipes. 
