ncio Crustacea from Devon and CormoaU. 203 



aLout twice the breadth ; they are each provided with four 

 plumose terminal sefre, 



III tlie male the iitth pair are very small and rudimentary. 



Furcal joints slender and about equal in length to the last 

 abdominal segment ; principal tail-set^e somewhat dilated at 

 the base. 



Ilab. Dredged at St. Mary's, Scilly Islands, in May 1903. 



Genus DactylOPUSIA, A. M. Xorman, 1903*. 



DactyJopusia valida, sp. n. 



This species resembles Dactylopusix tishoides (Glaus) in it.s 

 general appearance and size. The eight-jointed anteiuiules 

 are short and stout ; the tirst and second joints are longer 

 and the fifth and seventh shorter than the others ; the other 

 four, which are nearly of equal length, are each about a 

 third shorter than the tirst or secon ,1, as shown by the 

 formula — 



Proportional lengtlis of the joints. . 13.11.7.8.5.8.5.8 



Numbers of the joints 1 2 3 4 5 6 7 8' 



The three-jointed outer ramus o£ the posterior antennfe is 

 moderately large and stout and provided with several setie. 

 The mouth-organs resemble those of D. tisboides, but the 

 second maxillipeds are moderately stout and their terminal 

 claws elongated and slender. 



The first pair of swimming-feet are moderately stout ; tlie 

 outer branches are rather more than half the length of the 

 inner and armed exteriorly with strong spines ; the first 

 and second joints are very robust, their width being about 

 equal to three fourths of the length; the end joint is very 

 short and furnished with four spines and a seta; the spines 

 are of unequal length, the two outer being very small, 

 the other two strong and slightly clawed, the inner being the 

 longer; the inner branches are also moderately stout, the 

 first joint elongated, the second and third very short, and the 

 third armed with one long and one short and stout terminal 

 claw. The second, third, and fourth pairs resemble the same 

 three pairs in D. tisboides. 



In the fifth pair the primary joints are moderately elon- 

 gated and reach to about the extremity of the secondary 

 joints ; they taper slightly to the rounded distal end, which 



* Cf. Ann. «S: Mag. Nat. Hist., April lOO-"}. Norman, on change of 



