69 



had been used by 0. Fr. M'iiller in quite a different sense, viz., to designate 

 some common larval forms (Nauplii), it cannot properly be accepted, and tbe 

 Canon Norman has therefore recently proposed to substitute for this name that 

 of Tegastes, the type being considered by him to be T. satyrus of Glaus, which 

 species certainly belongs to the present genus in the restriction here adopted. 

 No less than 5 different species referable to this genus have been observed by 

 the present author off the Norwegian coast. 



41. Tegastes falcatus (Norman). 



(PL XLI). 

 Amymone falcata, Norman, Brit. Assoc. Report, 1868, p. 296. 



Syn: Amymone sphserica, Brady (not Claus). 

 rubra, Boeck (1872). 



Specific Characters. Female. Cephalic segment very deep, with the 

 postero-lateral corners greatly produced, acuminate; no chitinous stripe across 

 the back. Genital segment produced below into 2 strong, posteriorly-curving 

 hook-like projections. Distal part of urosome only very slightly projecting. The 

 innermost but one of the caudal setse peculiarly transformed, lancet-shaped. Pos- 

 terior maxillipeds rather powerful, with the hand oblong oval in form, and densely 

 ciliated along the palmar edge. Last pair of legs with the distal joint extending 

 to the tip of the inner expansion of the proximal one, the latter with 3 short 

 seta? along the curved anterior edge, and 2 unequal ones at the tip. 



Male a little smaller than female, and easily recognizable by the prehensile 

 character of the anterior antennae, and by the large, acutely-beaked spermatophore- 

 reservoir. None of the caudal setse transformed. Last pair of legs very narrow, 

 with the proximal joint small and simple. 



Body of a golden yellow colour, variegated with a dark reddish brown 

 pigment, especially along the ventral face and the posterior edges of the segments. 



Length of adult female 0.46 mm. 



Semarks. This form was first briefly described by Norman from the 

 Shetland Isles as Amymone falcata. It was subsequently erroneously identified 

 by Prof. Brady with A. sphcerica of Claus, which is a very different species, and 

 does not even belong to the same genus. The form recorded by Boeck as A. rubra 

 is identical with Norman's species. It is the largest of the Norwegian species, 

 and is moreover easily recognizable by the dark red colour of the body, and by 

 the 2 very hooked projections of the genital segment. 



