66 



terminal one armed on the hind face with 2 very coarse spinules, and having 

 moreover the proximal seta of the inner edge transformed into a slender spine, 

 denticulated inside. Last pair of legs, when reflexed, reaching to the end of the 

 caudal rami, distal part of right leg very narrow and (in the specimen examined) 

 doubled back upon the proximal part, terminal claw very strong and somewhat 

 flexuous, with a regular row of denticles along the concave edge; left leg with 

 the antepenultimate joint much dilated, and projecting at the end outside into 

 an oval lamella, terminal joint spoon-shaped. 



Colour. Body highly pellucid, with a very faint yellowish tinge. 



Length of adult male 1.90 mm. 



Remarks. As stated above, this form is as yet only known in the 

 male sex. The female will in all probability be less slender in form, with the 

 urosome shorter and 4-articulate. Whether the last pair of legs of the female 

 is constructed after the type of the species of Stephos, cannot be conjectured 

 at present. 



Occurrence. The solitary specimen described above was found, many 

 years ago, at Sjerjehavn, west coast of Norway, in a depth of about 100 fathoms, 

 soft, muddy bottom. 



Fam. 11. Tharybidae. 



Characters. Form of body short and stout. Cephalosome united with 

 the 1st pedigerous segment, front carrying below 2 soft tentacular appendages. 

 Last 2 segments of metasome coalesced. Urosome short, in female 3-articulate, 

 in male 4-articulate, the last segment being obsolete. Eye present. Anterior 

 antennee slender and of exactly the same appearance in the two sexes. Posterior 

 aiitennie with the outer rainus much larger than the inner. Oral parts of same 

 appearance in the two sexes, and rather ditfering in structure from those in the 

 2 preceding families; terminal appendages of anterior maxillipeds very delicate, 

 sensory. Natatory legs with the same number of joints in the rami as in the 2 

 preceding families. Last pair of legs present in both sexes, in female of com- 

 paratively simple structure, in male very large, though rather slender in form, 

 with none of the joints conspicuously dilated. 



