88 A KE-EXAMINATION OF AUSTHALIAN PYCiSOGONIDA, 



1908, Ammuthea assimilis, Loman, 1908, p. 59. 

 1913, Achelia assi?nilis, Bouvier, 1913, p. 140. 



Specimens. — Australian Museum Collection, G5220, 

 one microscope slide labelled "type." This contains three 

 specimens, all immature, one of doubtful sex, the other* 

 female. Zoological Collection, Sydney University, one 

 microscope slide containing two specimens (adult), both 

 males. 



As Loman has pointed out, Haswell's description of 

 thia species, pviblished in the early days of Pycnogonid re- 

 search, is not critical enough for present day purposes. I 

 have, therefore, decided to give a full account of the 

 species. 



The slide in the Australian Museum marked "type" 

 contains onlv immature specimens with chelate chelor)hore8 

 and immature ovigers. I cannot suppose that it was upon 

 these sjjecimens that Haswell's original description was 

 based. The specimens from the University of Sydney were 

 certainly the originals of Haswell's drawings, and no doubt 

 it is an oversight that these were not designated as the 

 types. 



BescriptUm. — The hody is disc like and broad, segmen- 

 tation practicalh^ non-existant, crurigers closely apjaroxi- 

 mated with no space between. 



CepJialoti is very slightly developed. 



Ocular fuhfrcle is situated near anterior edge of cepha- 

 lon and is of medium length, rounded at apex, with eyes 

 large, distinct, and pigmented. 



Ahdoinen is of medium length, semi-erect, tubular, 

 tapering and ornamented with a few spines towards apex. 



Chelophorex are imperfect in adult specimens. ScaiJe ia 

 simple, chela I'udimentarv. The whole organ measures 

 considerably less than half of the length of the proboscis. 



Falp'i are eight-jointed, second and fourth joints ai-© 

 longest, remainder small. The last five joints are providend 

 with hairs. 



Oi'iyers (male) ten jointed. First joint small and 

 about as long as wide, the second, third, fourth, and fifth 

 are progressively longer, the remainder are small, the tentk 

 being particular^ so. The last four joints bear simpla 

 spines and there is a terminal spine. The five terminal 

 joints are twisted into a spiral. 



Legs. — The three coxae are short, the second being a 

 little longer than the others. The first coxa bears terminally 

 a few simple spines each set upon a papilla. In the suc- 

 ceeding co'Xae a distal fringe is present consisting of many 



