PYCNOGONIDS 



291 



been mentioned, there are a few fine hairs, especially on /., /.i, /.2, and 

 /j.i, and a more or less regular row of small bristles along the dorsal side 

 of ts.2. 



Integument thin, clear, and with comparatively few cuticular cavities. 

 Color in alcohol light. 



Length about 2.5 mm. ; sexes of nearly the same size. 



SPECIMENS EXAMINED. 



Remarks. This species of Anoplodactylus, which I have called erectus 

 on account of the position of the caudal segment, is in many respects 

 very similar to A. petiolatus (Kroyer). The important differences are 

 shown in the following table : 



A. petiolatus. 



Trunk " somewhat short and stout, 

 and, relatively to its length, 

 rather broad." 



Lateral processes not much sepa- 

 rated. 



Caudal segment long, cylindrical, 

 abruptly acuminated, placed 

 horizontally. 



Proboscis of plain cylindrical form, 

 obtusely truncated. 



Immovable finger of chela almost 

 quite straight. 



Ovigera nearly as long as animal. 



Legs hardly two times length of 

 animal. 



Second tarsal joint strongly curved ; 

 4 to 6 spines on proximal part 

 of sole. 



A. erectus. 

 Trunk rather slender. 



Lateral processes well separated. 



Caudal segment not especially long, 

 more or less conical, directed 

 upward at a sharp angle. 



Proboscis not plain cylindrical, 

 narrower in basal portion. 



Fingers of chela both curved. 



Ovigera as long as, or longer than, 

 animal; third joint especially 

 proportionately longer than in 

 A. petiolatus. 



Legs proportionately longer; two 

 and one half times length of ani- 

 mal. 



Second tarsal joint not strongly 

 curved ; 7 to 1 1 spines on proxi- 

 mal part of sole. 



