56 T. V. HODGSON. 



especially so. The propodus is very slightly curved and covered ventrally with 

 short spinous setae, with, proximally, a row of four stout spines. Dorsally the setae 

 are small and scanty. The terminal claw is large, more than half the length of 

 the joint, and accompanied by two small auxiliaries. These claws arise on a process 

 from the oblique termination of the joint. The extreme end does not project much 

 beyond, and is supplied with numerous spinous setae. The rest -of the limb, coxae, 

 femur, and tibiae are fairly well covered with very small setae ; their precise 

 distribution is not easy to observe, but they appear to be deficient laterally ; they 

 are most abundant on the second tibia. The lateral line is well marked on the 

 three largest joints. 



The specimen above described is an adult female, and shows conspicuous Genital 

 apertures on a swelling at the extremity of the second coxa of all the legs. An 

 adult male shows smaller apertures on the three posterior legs only. 



The female was taken in 100 fathoms, rough ground, off the Barrier, in 

 Lat. 78 16' 14" S., Long. 197 41' 47" E. 



The male was taken in 300 fathoms, mud, off the Barrier, in Lat. 71 25' 40" S., 

 Long. 1 85 39' 06" E. 



EHYNCHOTHORAX. 



Rhinchothorax, 0. G. Costa, Microdoride Mediterranea (1861), p. 7. 



I have not seen Costa's original description of this genus or its attendant species. 

 In the 'Challenger' Report (14) it is included by Dr. P. P. C. Hoek in his list of 

 the then known species of Pycuogonida, and at the same time condemned as being 

 insufficiently described. It is not a little remarkable that out of ten species then 

 recorded from the Mediterranean only one is described in Dr. Dohrn's monograph (8). 

 Zoologists are indebted to that author for the careful and full descriptions of the 

 Pycnogonida therein recorded. The genus and species of Rldnchothorax mediterraneus 

 Costa a,re fully described, and differ in many particulars from the original description. 



Dr. Dohrn states 



That the Chelifori are absent. 



That the Palp is eight-jointed, but that fusion has taken place, reducing 

 the number of distinct joints to five. Five distinct joints are figured, 

 the limits of the remainder being obscure. 

 That the Ovigers ar.e eleven-jointed. In both figures, however, only ten 



joints are shown. 



1 have no hesitation in placing the species described below in the genus Rhyueho- 

 thorax as defined by Dr. Dohrn for these reasons : the general aspect of the animal is 

 similar ; the proboscis is cleft at its extremity ; though the palps arc only five-jointed, 

 the feebly-developed extremity seems to indicate some reduction is taking place ; and 

 the ovigers are ten-jointed, and the exact counterpart of those figured by Dr. Dohru. 



