﻿PYCNOGONIDA. -c 



Chelifori incompleti, cliela plus \cl mimis iiiniiinnta. 



Palpi expleti. 



Pedes oviferi in utroque sexii. 



The trunk more or less distinctK' se.s^iueiited. 



The proboscis swollen, more or less movably articulated. 



The chelifori defectively developed, the chela more or less rudimentar\'. 



The palps well developed. 



Ovigerous legs present in both sexes. 



Gen. Ascorhynchus G. O. Sars. 



Ascorhynchus vSars, Prodr. Crust. P\'cnog,, 1877. 



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

 principal work on the P\'cnogonids, Pycnogonidea, 1891, p. 132, I must, however, on account of an 

 observation by the examination of these animals, wish to ha\'e it altered a little. By e.xaniining a 

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

 the whole chela, however, was somewhat shrivelled, and the fingers relativeh" much thinner, not onl\- 

 than in other P\'cnogonida , but also thinner tlian in earlier stages of the same species, so that the 

 whole chela gets a somew hat rudimentary appearance, cp. my figure, pi. \', fig. 13. This obser\ation 

 also influences the familv-diaa:nosis. 



Ascorhynchus tridens n. sjx 



PI. V. Fig 7—18. 



Corpus sat gracile, marginibus posticis aniiulorum corporis ipsis in apiccm ])roductis. 



Colhim sat breve. 



Rostrum crassum, manifeste restrictTim. 



Tuber ocidare magnum, apice in anguluni producto, dentibus lateralibus acutis. 



Segfnientum caudale gracile, libratum. 



Chelifori breves; digiti stepissime imniinuti, interdum prodncti, graciles. 



Palpi longiusculi. Organum sensilc manifestuuL 



Pedes oviferi longiusculi, laminis partis terminalis jiedum ad basin in dcntes .senos magnos incisi.s. 



Pedes gres.sorii breviusculi, scabro.si, dense hirti, articulo priore tarsal! <iiuim altero ter breviore, arti- 



cido altero minus dense pectinato, articulo quarto pedum irium pavium posterionim .solummodo 



nodulo armato. 

 Long, tota (rostro porrccto) 10""". Rostri 4""". Corporis 5""". vScgmenti caudalis 1,6""". 



