257 Part III — Seventeenth Annual Report 



Cletodes tenuipes, T. Scott. 



1897. Clef odes tenuipes, T. Scott, Fifteenth Ann. Rep. Fish-. 

 Board for Scot., Pt. III., p. 170, PI. I., figs. 19-27. 



This species, which is apparently rare, was also obtained in the same 

 gathering from Cromarty Firth in which the Huntemannia occurred. 

 Cletodes tenuipes was described from Clyde specimens, and it is interesting 

 now to find it also on the East Coast. 



Cletodes perplexa, sp. n. (PL XL, figs. 12-20; PI. XII., fig. 1). 



Description of the Female. — Length of the specimen figured , 67mm. 

 (-g 1 -^ of an inch). The body is stout anteriorly but tapers gradually 

 towards the posterior end ; in spirit specimens the tail is generally incurved 

 as shown in the figure (fig. 12, PI. XL). Ilostrum short and slightly 

 recurved. Antennules very short, moderately stou,t, and composed of 

 five joints ; the first and second joints are large; the third is about half 

 the size of the second ; the fourth is very small ; and the last is about one 

 and a half times the length of the third (fig. 13, PI. XL). The approxi- 

 mate proportional lengths of the various joints are shown in the formula — 



Numbers of the joints, 1 • 2 • 3 • 4 • 5 



Proportional lengths of the joints, 21 • 25 ' 12 • 4 • 19 



There are a number of coarsely plumose setae on the distal half of each 

 antennule, and a small asthetask springs from the end of the third joint. 

 Antennae three-jointed ; secondary branches small, each furnished with 

 two coarsely plumose setse and a small hair (fig. 14, PI. XL). Mouth 

 organs nearly as in Cletodes linearis (Claus) ; figs. 15 and 16, PL XL, 

 show the form of the anterior and posterior foot-jaws. The inner branches 

 of the first four pairs of swimming feet, which are all two-jointed, have 

 the first joint small, while the second is slender and elongate. The inner 

 branches of the first pair have the first joint somewhat dilated, while the 

 principal terminal seta of each is fully three times the entire 

 length of the inner branches ; these brauches are also somewhat shorter 

 than the three-jointed outer branches (fig. 17, PL XL). The inner 

 branches of the second, third, and fourth pairs are comparatively shorter 

 than those of the first pair, and the terminal setae of both the inner and 

 outer branches of these three pairs are long and plumose (fig. 18, PL XL). 

 The fifth pair of feet differ from those usually observed in Cletodes ; the 

 basal joint, which is proportionally much dilated, is produced into a large 

 and strong spine-like process which is slightly curved at the end and 

 bordered with minute spinules ; the secondary joint is rudimentary, and 

 bears three small setae at its truncate apex ; two setae spring from the 

 opposite margin of the large basal joint (fig. 19, PL XL). The caudal 

 f urcae are long and slender ; two small setae spring from near the middle of 

 the outer margin of each of the furcae, and they each bear a long spini- 

 form terminal seta (fig. 1, PL XII.). 



The male differs little from the female, exceot that the antennules are 

 modified in the usual way. The fifth pair of thoracic feet are nearly the 

 same as those of the female (fig. 20, PL XL). 



Habitat. — Vicinity of Smith Bank, Moray Firth. Eare. 



Remarks. — This very distinct species was obtained amongst some 

 dredged material collected on the 6th October 1898, and sent to me by 

 Mr. F. G. Pearcey. The fifth thoracic feet form one of the most striking 

 characters of this species, not only because of their remarkable form, but 

 also because in all the specimens examined they projected nearly straight 

 out from the body of the animal instead of being adpressed, as is usually 



