458 Mr. T. V. Hodgson on a neio Pycnogonid 



Measurements o/Rh. auritus and Rh. capensis. 



IRh. auritus. JRh. capeiisis. 



Type. 

 c? ad. 



(8 adult spcms., 

 2 skulls.) 



Min. 



Max. 



Forearm 



3rd linger, metacarpal 



„ 1st phalanx 



„ 2ud phalanx 



4th finger, metacarpal 



,, 1st phalanx 



„ 2nd phalanx . . . . . 

 5th finger, metacarpal 



„ 1st phalanx 



„ 2nd phalanx 



Tail, from anus 



Mandible 



Front of upper c to back of m 



,, lower c to back of m 



mm. 



50 



33-8 



15 



24 



35-7 

 9-5 



15 



35-3 



109 



13 



20-5 



13-8 

 7-7 

 8-2 



mm. 



47-6 



32-2 



14-2 



23-3 



35 

 8-2 



15 



34 



10-7 



12 



20 



13-7 

 7-3 

 8-2 



mm. 



51-5 



35 



16-6 



26 



38 

 97 



16 



38 



12 



14 



23 



13-9 

 7-7 ■ 

 8-3 



LXIII. — On aneio Pycnocjonid from the South Polar Regions. 

 By T. V. Hodgson, Biologist to the National i\utaictic 

 Expedition. 



[Plate XIV.] 



DuEiNG her stay in winter-quarters in McMurdo Baj the 

 ' Discovery ' secured among the biological collections a very 

 large number of Pycnogonids, the species as well as indi- 

 viduals being abundant. Among them is a species which 

 possesses a pair of ambulatory appendages more than the 

 number hitherto allotted to the group, and on that account 

 it has been suggested to me by the Director of the Natural 

 History Museum to publish at once a description of this 

 interesting species. 



It appears to be fairly common, a single individual being 

 frequently captured either with the D net * or the tangles 



• The D net is a light trawl, of which the iron frame is shaped like 

 the letter D, hence the name ; both from its lightness and its shape it 

 proved particularly useful for work under the ice. 



