170 



lln. Amphiaseus typhlops, u. <>. Sars, n. sp. 



(I'l. (XI). 



Specific Characters. Female. Body very slender, sublinear in i'unu. \vith 

 the '2 chief division* m-arly equal in length. Rostrum inucli attenuated, termin- 

 ating in an acute point. Caudal raiui unusually prolonged, being fully twice as 

 long as they are broad, apical seta' <il' moderate length and only slightly thick- 

 ened at the hasr. K\e \\liollv ahseiit. Anterior antenna; moderately elongated 

 and less attenuated than ill most other species, 8-articulate. 4th joint not much 

 longer than ,'ird. terminal part scarcely attaining half the length of the proximal. 

 Posterior antenna 1 with the outer ramiis ahout the length of the terminal 

 joint of the inner, middle joint very small and without any seta. Oral parts 

 normal. 1st pair of le.^ r s \\ith the outer minus about as long as the 1st joint of 

 the inner, middle joint with a well-developed seta inside, last joint somewhat 

 longer than the middle one. oblong oval in form, and armed with 4 slender spines 

 and a still more slender ciliated seta inside the spines; 1st joint of inner ramus 

 about the length of the other 2 combined, last joint very slender, linear, 3 times 

 as long as the 2nd, apical claw very long and evenly curved. Natatory legs with 

 the rami rather narrow and with a larger number of seta? than in the 3 preceding 

 species, outer apical seta of inner ramus spiniform. Last pair of legs with the 

 distal joint very narrow, oblong in form, and carrying <> rather slender marginal 

 setae; inner expansion of proximal joint narrow triangular, and extending to about 

 the middle of the distal joint, marginal seta- 5 in number. Ovisacs comparatively 

 small, with a very limited number of ova. 



Ma/'' with the 2nd basal joint of 1st pair of legs produced inside at the 

 base to a small knob-like prominence, beyond which is a comb-like series of 4 

 blunt spines. Inner ramus of ^nd pair of legs rather slender, being fully as Ion- 

 as the outer, and transformed in the usual manner, the distal joint carrying out- 

 side, at some distance from the tip. '1 spiniform appendages, the outer of which 

 is shorter ;ni(l thicker than the inner. Last pair of legs, as usual, smaller than 

 in female, with the inner expansion o| the proximal joint obtusely conical in form, 

 and earning on the tip ~1 spiniform seta- of somewhat unequal length. 



('olour whitish. 



I <'iii;tli of adult female li.'.i.i mm. 



Remtt'i This is a \rr\ distinct and easily recogni/able species, being 



especially characterised by the \ery slender linear form of the body, the narrowly 

 tapered rostrum, and the unusually prolonged caudal rami. Not the slightest 

 trace of an eye could be detected in the living animal. 



