291 



before with a species of Pycnogonids which shows sucli a strongly 

 developed dimorphisni of the two sexes. Not only are the feruales 

 characterised by highly iuflated » femora" (thigh : the 4tb joint of 

 the leg), but moreover the males have well-developed palps of which, 

 in the females , there is no tracé. There are 2 full-grown males, 

 3 full-growu females, 4 young females and 5 very young specimens 

 of which it is impossible to recoguize the sex. 



Pollene dimorpha n. sp. bas in general the appearance of a true 

 Pallene. The length of the body is 2.6 mm., there being no 

 difference in length between the full-grown male and female. (Fig. 

 1 and 2). The length of the leg is also the same in both sexes , 

 viz: about 8 mm. The proboscis is short and plump ; the cepha- 

 lothoracic segment is rather long, its length being nearly | of 

 the whole length of the body. Oculiferous tubercle cylindrical- 

 conical , bearing laterally short horns at the place where the cylin- 

 drical part passes into the conical tip. Eyes without pigment, 

 rather large. Second and third thoracic segments short , the lateral 

 processes for the insertion of the legs being however distinctly 

 separated. Third and fourth thoracic segments not coalescent. Caudal 

 segment large , conical , directed upwards. Each lateral process 

 bears dorsally near the extremity a conical knob. 



The mandibles (fig. 3) are rather powerful, the first joint cylin- 

 drical, slightly curved and elongate; the hand is well developed, 

 the claws are curved and furnished with numerous teeth ; the tips 

 of the claws cross for a considerable extent. The first joint is 

 beset with a few, the second joint with numerous hairs. 



The palpi (fig. 3) of the males are four-jointed and longer 

 than the first joint of the mandibles. The third joint is the lar- 

 gest. The third and fourth joints are furnished with well-developed 

 hairs. 



The ovigerous legs of the males are considerably stronger than 

 those of the females. The fifth joint is the longest in both sexes; 

 in the males it terminates — as is the rule in this genus — in a 

 lobe-like expansion beset with a few hairs. A short but distinct 

 claw is attached to the extremity of the tenth joint (Fig. 6). 



