EEPORT ON THE PYCNOGONIDA. 



71 



Colossendeis media, n. sp. (PI. X. figs. 10, 11). 



Diagnosis. — Palpi more than once and a half the length of the proljoscis ; ninth joint 

 not attached laterally to the eighth ; together they are as long as the tenth joint. 

 Denticulate spines of the four last joints of the ovigerous legs in five distinct rows. 

 Legs not quite three times as long as the body. Otherwise this species resembles the 

 foregoing. 



Description. — 



Length of the proboscis, . 

 Length of the trunk, 

 Length of the abdomen, . 

 Total length of the body, . 

 Length of the palpus. 

 Length of the ovigorons leg, 

 Length of the leg of the third pair. 



This species is nearly of the same shape and the several parts show almost the same 

 proportions as in Colossendeis gracilis, Hoek. The only differences are the follow- 



ing :- 



1. The palpi are longer, and of the three last joints the very small eighth joint does 

 not bear the following joint laterally, but quite in front (PI. X. fig. 10). 



2. The denticulate spines of the ovigerous legs (of the four last joints) are placed in 

 five distinct rows. They are small with the exception of those of the outermost row, 

 which are a great deal larger. These spines have the flattened shape of those of other 

 species of Colossendeis. Those which are not broken, show on the margin very small 

 hairs. 



3. The legs are not quite thrice as long as the body, The fourth joint is twice as 

 long as the sixth. The claw is longer than the second tarsal joint. The two tarsal joints 

 are about the same length, together they are as long as the body. 



The body and legs are almost entirely smooth ; when seen with the microscope very 

 short hairs are to be observed ; those on the palpi are a little stronger. On the second 

 joint, on the ventral surface, of every leg very small genital pores are to be observed. 

 However, as the two specimens of this species probably are not quite adult, I could not 

 determine to which sex they belong. 



Habitat. — This species was dredged at Station 298. November 17, 1875. Lat. 

 34° 7' S., long. 73° 56' W. Depth of the sea, 2225 fathoms. Bottom temperature, 1-3° C. 

 Bottom of the sea, grey mud. 



Observations. — This species is nearly allied to Colossendeis gracilis. However, as the 

 differences I have pointed out are present equally in both specimens I cannot consider 

 them identical with that species. 



