NOTES ON THE GENUS MONSTRILLA. 565 
Notes on the Genus Monstrilla, Dana. 
By 
Gilbert C. Bourne, M.A., F.L.S., 
Fellow of New College, Oxford, and Director of the Marine Biological 
Association. 
With Plate XXXVII. 
In 1848 Dana! described under the name of Monstrilla 
viridis an anomalous Copepod, taken in the Sulu seas during 
the Wilkes’ Exploring Expedition. In 1857 another specimen 
of this remarkable genus was found by Sir John Lubbock? at 
Weymouth, and was described by him as M. anglica. Two 
years later Semper,’ writing to Kolliker from Zamboanga, 
gave an account of a Cyclops-like parasitic Crustacean (Cyclops- 
aihnlichen Schmarotzerkrebse) which is clearly of the genus 
Monstrilla; and in 1863 Claparéde* gave a detailed account of 
several specimens from St. Vaast la Hougue, to which he gave 
the specific name of Monstrilla Dane. At about the same 
time Claus’ described as Monstrilla helgolandica two 
females of this genus taken by him in Heligoland. No further 
captures of Monstrilla were recorded from this time up to 
1 J. D. Dana, ‘ Proc. Amer. Acad. Art. Sci.,’ vol. ii, p. 53. See also the 
‘Crustacea of the U. 8S. Exploring Expedition,’ part ii, p. 1313. 
2 J, Lubbock, ‘Ann. Mag. Nat. Hist.,’ 2nd ser., vol. xx, p. 409, pl. x, 
figs. 7 and 8. 
3 C. Semper, ‘ Zeit. Wiss. Zool.,’ xi, p. 105. 
4 Hd. Claparéde, ‘ Beobacht. tiber Anat. u. Entwicklungsgesch. Wirbellos. 
Thiere,’ Leipzig, 1868, p. 95, Taf. xvi, figs. 1—6. 
® C. Claus, ‘ Die freilebenden Copepoden,’ Leipzig, 1863, p. 164, Taf. xii, 
fig. 15, and Taf. xiii, fig. 9. 
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