41 _ 



Remarks. The female of this form has been described and figured in the 

 main part of this work, and I have therefore here confined myself to an indication 

 of the sexual differences exhibited by the adult male. These differences are, as 

 shown above, rather striking. 



Occurrence. The present form, of which previously only 3 female spe- 

 cimens had come under my notice, occurred rather frequently in one locality near 

 Korshavn, at a depth of about 20 fathoms, sandy bottom. 



Page 233. 



Add the following genera and species belonging to the family Cantho- 

 camptidoe: 



Gen. Tetrag-OnleepS, Brady, 1880. 



Generic Characters. Body of narrow cylindrical form, with the posterior 

 division unusually slender. Cephalic segment comparatively large and deep pro- 

 jecting in front in an obtuse rostral prominence. Caudal rami conically tapered. 

 Anterior antennae well developed, with the 1 st joint much the largest and produced 

 at the . end outside to a claw-shaped process. Posterior antennae with the proximal 

 joint distinctly subdivided, outer ramus small, uniarticulate. Anterior lip securi- 

 formly produced. Mandibles strongly built, with the palp well developed, biramous. 

 Maxillae with the epipodal lobe obsolete. Anterior maxillipeds with 3 setiferous 

 lobes inside the basal joint, apical part distinct, biarticulate. 1st pair of legs 

 with the inner ramus much longer than the outer and biarticulate. The 3 suc- 

 ceeding pairs of legs with the inner ramus likewise biarticulate, but shorter 

 than the outer, the latter in 4th pair much elongated; natatory setse in all 3 

 pairs much reduced in number. Last pair of legs not very large, distal joint 

 conically produced and in some cases confluent with the proximal one. 



Remarks. This genus was established by Prof. Brady in the year 1880, 

 to include a single species, T. malleolatus. The generic name refers to the 

 quadrangular form of the head, as seen laterally, chiefly caused by the very 

 prominent anterior lip. In latter years several additional species of this genus 

 have been described by Th. Scott; but most of these have recently been removed 

 by that author, to constitute the types of separate genera. The form described 

 below ought, I think, to be referred to the original genus. 



