PYCNOGONIDA OF NEW ENGLAND AND ADJACENT WATERS. 483 



Accessory legs stout, roughened by minute tubercles, the outer 

 joints with many short stout hairs, most of which are directed back- 

 ward; the two basal joints are very stout, the first shorter than its 

 width, the second about twice as longj third nearly two and a half 

 times the second, somewhat clavate, suddenly constricted a short dis- 

 tance from the base; fourth half the length of the third, considerably 

 longer than the fifth; sixth much smaller than the preceding. 



Legs very long and slender; first and third joints very short; second 

 longer and clavate; the three following joints are much longer, sixth 

 longest; tarsus very short, deeply em arginate; propodus curved, with 

 a rounded lobe near the base bearing five or six strong spines ; these 

 are followed by a series of much smaller ones; dactylus stout, about 

 two-thirds the length of the propodus. Entire surface of the body 

 scabrous. Legs with a few scattered hairs, which are most numerous 

 on the outer joints. 



The sexes resemble each other closely, but the females do not i)ossess 

 accessory legs ; the female is, as a rule, slightly larger than the male. 

 Length 7 millimeters ; legs 30 millimeters. 



This species is nearest to '•'•PlioxicMlidiumiyetiolatum'''' Kr., of Europe. 

 In the latter species, however, according to the figures, the anterior 

 segment is much more slender, and it is emarginate between the bases 

 of the antennae, which are thus separated by a distinct interval; the 

 posterior segment is represented as stouter and shorter; the rostrum 

 more abbreviated; and the propodus of a different shape. Kroyer 

 figures the accessory legs with seven joints, probably mistaking the con- 

 striction near the base of the third joint for an articulation. 



Common between tide-marks and down to six fathoms in Vineyard 

 Sound, where it is found on shelly bottoms '' clinging to and creeping 

 over the hydroids and ascidians." '• It is most frequently deep purple 

 in color, but gray and brown specimens are often met with " ( Verrill). 

 It is also taken rarely in the Bay of Fundy, there being a single speci- 

 men in a vial with FhoxieMlidium maxillare and Pycnogonum Uttorale 

 from Eastport. 



Specimens examined. 



