PYCNOGONIDA. 55 



Chelifori incompleti, chela plus vel minus iinminuta. 



Palpi expleti. 



Pedes oviferi in utroque sexu. 



The trunk more or less distinctly segmented. 



The proboscis swollen, more or less movably articulated. 



The chelifori defectively developed, the chela more or less rudimentary. 



The palps well developed. 



( )vigerous legs present in both sexes. 



Gen. Ascorhynchus G. O. Sars. 



Ascorhynchus Sars, Prodr. Crust. Pycuog., 1877. 



Referring in all essentials to the generic diagnosis of Sars, such as he has given it in his 

 principal work on the Pycnogonids, Pycuogonidea, 1891, p. 132, I must, however, on account of an 

 observation by the examination of these animals, wish to have it altered a little. By examining a 

 full-grown female I found that this specimen had long fingers with an ecpial development of both; 

 the whole chela, however, was somewhat shrivelled, and the fingers relatively much thinner, not only 

 than in other Pycnogonida, but also thinner than in earlier stages of the same species, so that the 

 whole chela gets a somewhat rudimentary appearance, ep. my figure, pi. V, fig. 13. This observation 

 also influences the familv-diagnosis. 



Ascorhynchus tridens n. sp. 



PL. V. Fig. 7— 18. 



Corpus sat gracile, marginibus posticis annulorum corporis ipsis in apicem productis. 



Collum sat breve. 



Rostrum crassum, manifeste restrictum. 



Tuber oculare magnum, apice in angulum producto, dentibus lateralibus acutis. 



Segmentum caudale gracile, libratum. 



Chelifori breves; digiti ssepissime imminuti, interdum producti, gracik-s. 



Palpi longiusculi. Organum sensile manifestum. 



Pedes oviferi longiusculi, laminis partis terminalis pedum ad basin in dentes senos magnos incisis. 



Pedes Pressorii breviusculi, scabrosi, dense hirti, articulo priore tarsali quam altero ter breviore, arti- 



o 



culo altero minus dense pectinato, articulo quarto pedum trium parium posteriorum solummodo 

 nodulo armato. 

 Long, tota (rostro porrecto) io m,n . Rostri 4""". Corporis 5™". Segmenti caudalis 1,6""". 



