470 Part III. — Twentieth Annual 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 M. 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 sette, whereas in M. 

 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 

 setse, the number observed being either three or six. 



Thaumaleus thompsoni, Giesb. PI. XXV., figs. 5, 6. 



1892. Thaumaleus thompsoni, Pelagischen Copepoden des Golfes 

 von Neapel", p. 584, pi. 46, figs. 7, 27, 31, 36, 40. 



A male specimen of a Copepod, which is apparently identical with 

 Thaumaleus thompsoni, 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 segment is, according 

 to Dr. Giesbrecht, distinctly more dilated than the other. The caudal 

 furca in the male are each provided with three setae (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 furca is 

 usually three or four, while Monstrilla, on the other hand, is provided with 

 five or six furcal setae. 



LICHOMOLGID.E. 



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. Kept, of the 

 Fishery Board for Scotland, pt. iii., p. 206, pi. iv., figs. 

 1-12. 



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. 



