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BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



shortest of all. The three coxal joiuts short, each being about as long as broad, 

 and somewhat longer than the lateral process ; the three together equal half the 

 length of the trunk proper, from the base of the proboscis to the base of the caudal 

 segment. Femur slender, slightly curved, somewhat longer (in the second legs) 

 than the length of the body ; first tibial joiiit equals the femur in length, more 

 slender, but not tapering ; second tibial joint a trifle over two-thirds the length of 

 tlie first, and tapering evenly toward its distal end. The tarsal joints are short, 

 the first being about equal to the length of the coxal region, and the second 

 slightly more than half the length of the first ; both are practically straight, and 

 are armed only with a slight projection ventrally at their distal ends. The claw 

 is small, scarcely over a fourth the length of the second tarsal joint, and stout for 

 its length. Auxiliary claws wanting. 



On the ventral side of the second coxal joint, is a low transverse prominence. 

 This is somewhat more pronounced on the third aud fourth legs, wliere the small 

 genital apertures are situated, not at the very top, but upon its proximal face. 

 The genital apertures were plainly distinguished in the two larger specimens, which 

 dissection showed to be females, but could not be made out iu the small individ- 

 ual, tile sex of which was not determined. 



The body and appendages, except as noted in the above description, are entirely 

 smootli. The two larger specimens are a light straw-color (iu alcohol) ; the 

 smaller one is lighter. Under the microscope the integument has a granular ap- 

 pearance, due to its being marked everywhere by minute irregular whitish dots. 



Measurements in Millimeters. 



Attached to the legs of one of the larger specimens (specimen U) were a half- 

 dozen curious capsules, which I judge are similar to those found by Hoek (1881, 

 p. 65 and 143) on three specimens (two females and a male) of Colossendeis 

 leptorhynchus. These bodies are 2 to 2.5 mm. in diameter, and more or less 

 hemispherical in shape (pi. 3, fig. 13). There arises excentrically from the flatter 

 side a short stalk by which they are fastened to the legs of the pycnogonid. The 

 interior contains a quantity of whitish flocculent material, among which are small 

 bodies 0.07-0.1 mm. in diameter, which appear to be eggs. Sections of this poorly 



