8 DR P. P. C. HOEK ON THE 



the length of the different joints is as follows : — First and third joint as long as 

 the lateral process, at the end of which the leg is inserted. Second joint more 

 than thrice as long as the first, slightly swollen towards its distal extremity. 

 Fourth joint more than twice as long as the second, and even a little longer than 

 the fifth joint. Sixth, seventh, and eighth joints combined once and a half as 

 long as the fifth. First to fourth joint almost of the same thickness, fifth to 

 eighth joint gradually growing more slender ; all the joints are furnished with 

 a longitudiual darker coloured stripe, as is common in Pycnogonids. The first 

 three joints of the legs are almost quite smooth, the outer joints rather hairy. 

 The structure of the last two joints of the leg can be judged from fig. 5. They 

 are not so slender as the same joints of P. longirostris as figured by Wilson. 

 The armature, however, is much the same as in that species. 



The only specimen of this species which was collected by the " Triton " is 

 a male ; as far as I could make out without mutilating the animal, the small 

 genital pores are only present on the two hindermost legs, and situated ventrally 

 near the distal extremity of the second joint. The ovigerous leg contains a 

 glandular organ with small opening near the beginning of the fourth joint, and 

 so does the fourth joint of all the legs. Of the latter the porus is placed at the 

 end of a tubular process""" inserted about the middle of the joint. As shown 

 in fig. 6, the excretory canal, which passes through the tubular process, has a 

 vesicular swelling at its base. Most probably these glandular organs do not 

 occur in the females of this species. 



The intestinal caecum which enters the mandible in this species is well 

 developed (fig. 2) ; it can be traced till in the last, the claws bearing joint. 

 The total length of the body is 8f mm., that of a leg of the hindermost pair 

 26 mm. 



Together with Pallene malleolata, Nymphon macronyx, and N. macrum, this 

 interesting Pycnogonid was dredged at Station 10 of the cruise of H.M.S. 

 " Triton." A young Lamellibranch mollusc (an oyster ?) is affixed to one of its 

 legs. 



Mr E. B. Wilson (1881) proposed a new genus for those Pycnogonids 

 which come near to Phoxichilidium., M. Edw., but which are characterised by 

 three-jointed (four-jointed, Wilson) mandibles and ten -jointed ovigerous legs 

 present in both sexes. Moreover, it is distinct on account of the existence of 

 rudimentary palpi. Wilson describes two species as belonging to this genus, 

 P. forfitifer and P. longirostris, and he supposes that Kroyer's Phoxichilidium 

 fiuminense should also be referred to this genus. No doubt he is right in 

 this supposition, although the extra articulation of the mandible is wanting 



* Wilson hints that this glandular duct might be a character of generic significance. It occurs, 

 however, in numerous genera, as in Phoxichilidium, Oorhynchus, &c. 



