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Part III. — Sixteenth Annual Report 



pleased that Dr. Giesbrecht has so far settled the question as to the value 

 which should be placed on the structural difference observed in this species, 

 and referred to in the above description, and has given to it a more satis- 

 factory position in the group to which it is related. 



Stephos minor, T. Scott. This species, first described from specimens 

 obtained in the Firth of Forth, was observed among some dredged 

 material from Otter Spit. One of the specimens from this locality was a 

 male, the structure of the fifth thoracic feet of which cannot be con- 

 founded with any allied form. 



Steplios fultoni, T. and A. Scott (PI. XV. figs. 5-16). 



1898. Stephos fuUoni, T. and A. Scott, * Ann. and Mag. Nat. 

 Hist.,' ser. 7, vol. i. p. 185, PI. X., figs. 1-8, and PI. XL, 

 figs. 1-4. 



This fine species, which was first noticed in 1896 amongst some 

 washings of trawl-net refuse from Kilbrannan Sound, has been obtained a 

 second time in a small quantity of dredged material collected in 1897 near 

 Otter Spit, Loch Fyne. Stephos fultoni differs from the other two 

 described members of the genus in the fifth thoracic feet in the female 

 being scarcely symmetrical ; and it may be remarked that, so far, this 

 Clyde species shows a departure from the normal characters of the genus. 

 The antennules of Stephos fultoni (fig. 6) are twenty-four-jointed, and 

 they resemble those of Stephos minor in the arrangement of the joints, 

 but the proportional lengths of the joints are rather different {see 

 fig. 6). The antennae and mouth-organs (figs. 7-9) are somewhat similar 

 in structure to those of Stephos minor. The second, third, and fourth 

 pairs of swimming feet are proportionally rather more slender and elongate 

 than those of that species. As already stated, the fifth pair in the 

 female (fig. 13) are scarcely symmetrical, the end-joint of the right foot (?) 

 is of a broad, knife-like form, and has the posterior half of the outer 

 margin finely serrated, but the end-joint of the left foot (?) assumes some- 

 what the form of a " tap-root," being dilated at the base, and then, after 

 suddenly contracting to a small extent, it tapers gradually to the pointed 

 apex. 



In the male the chief distinctive feature is the remarkable and power- 

 ful development of the fifth thoracic feet (fig. 14). The structure of the 

 left foot is cumbrous and complicated : it terminates in a strongly dilated 

 appendage that is armed with a large and dark-horn-coloured movable 

 claw distinctly bifid at the extremity, while in addition to the claw there 

 are several flexuous appendages of moderate length and stoutness. The 

 right foot is slender, and is somewhat similar to the same foot in Stephos 

 minor, but the end-joint is quite different, being curved like a reaping- 

 hook, and with the basal part slightly produced in a direction opposite to 

 that of the hook-like process. It may be noted that the left foot some- 

 what resembles the same appendage in Stephos gyrans (Giesbrecht), but 

 besides other differences Stephos gyrans wants the strong bifid claw which 

 gives such a marked character to the left foot of Stephos fultoni. 



The name adopted for this remarkable species is that of the Superin- 

 tendent of the Scientific Investigations of the Fishery Board for Scot- 

 land— T. Wemyss Fulton, M.D., F.K.S.E. 



