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Part LIT. — Seventeenth Annual Report 



the Moray Firth Thysanoessa neglecta, Kroyer, is frequently the pre- 

 vailing form. * Nyctiphanes norvegicus, which is also of frequent 

 occurrence, and of large size, in Loch Fyne, is generally comparatively rare 

 in the Moray Firth and in the Firth of Forth. This Nyctiphanes, though 

 occasionally met with in considerable numbers in other parts of the Clyde 

 district, seldom attains such a large size as it does in Loch Fyne. 



Erythrops serratus and Erythrops elegans have been obtained in 

 gatherings collected during the past year both in the Clyde and in Loch 

 Fyne, but neither have been observed in the Moray Firth. Erythrops 

 serrata formed part of the contents of a hake's stomach captured at 

 Station XIY. (Loch Fyne). The Epicarid parasite Aspidoecia Normanni, 

 Giard and Bonnier, was obtained on Erythrops elegans at Station VII., 

 September 1898. 



Siriella norvegica, G. 0. Sars, was obtained at Station VII. (Firth of 

 Clyde). The Siriella}, though represented in the Clyde by at least four 

 species, are usually of rare occurrence, so that even the commoner forms 

 are worth recording. Siriella norvegica is one of the less familiar of the 

 British Siriellw. 



Scliistomysis ornatus, G. 0. Sars, and Hemimysis lamornai (R. Couch) 

 has been occasionally met with in the Clyde tow-net gatherings during 

 the past year. The first has been obtained in gatherings from Stations 

 VII. and VIII., near the mouth of the estuary, and from Stations XIV. 

 and XVII. in Upper Loch Fyne ; the other was obtained in a gathering 

 from Station VII. 



Leptomysis gracilis, G. O. Sars, and Leptomysis lingaura, G. 0. Sars, 

 were also obtained in Clyde tow-net gatherings recently examined. Lep- 

 tomysis gracilis occurred in a gathering from Station VIII., and Lepto- 

 mysis lingvura in two different gatherings from Station VII., and in 

 gatherings from Stations XIV. and XVII. 



Mysidop>sis gibbosa, G. 0. Sars, Mysidopsis didelphys (Xorman), and 

 Mysidopsis angusta, G. O. Sars, have all occurred in gatherings recently 

 collected in the Clyde and Upper Loch Fyne. Mysidopsis gibbosa was 

 obtained in gatherings from three stations, viz., Stations VII., VIII., and 

 XVII.; Mysidopsis didelphys in a gathering also from Station XVII., and 

 Mysidopsis angusta in one from Station VIII. 



Before concluding these notes on the tow-net gatherings collected on 

 board the " Garland " and forwarded for examination, it may be of 

 interest to refer to a young form of crustacean which is sometimes met 

 with in these gatherings. 



The study of the changes of form to be met with in the life-history of 

 the Crustacea is a profoundly interesting one. The variations of form 

 observed in the different species are sometimes so perplexing that they 

 have occasionally puzzled even experienced students. Numerous larval and 

 young forms are now and again captured in the tow-nets, but usually 

 they belong to species that are fairly well known. It sometimes happens, 

 however, that specimens are obtained which are not so easily disposed of, 

 and I now draw attention to a curious form which is occasionally noticed 



* Thysanoessa negleda has recently been observed in the Clyde. It occurred in a tow- 

 net gathering from Station X.. collected on the 16th of January last. An exposition of 

 the characters which distinguished ^his from the closely allied species, T. longicaudata. 

 will be found in Rev. Dr. A. M. Norman's excellent "Revision of the British Schizopoda," 

 published iu the " Annals and Magazine of Natural History," June- September 1892. 



