REPORT ON THE PYCNOGONIDA. 67 



The intervals between the well-developed lateral processes are comparatively large. 

 The proboscis is not quite half so long as the total length of the body. It is very stout, 

 and shows a considerable swelling in the middle, and another at the extremity. The 

 abdomen is small, its length about one-fifth the length of the trunk. 



The palpi are comparatively stout, shorter than those of Colossendeis gigas, but 

 longer than those of Colossendeis leptorhynclms. The first two joints are very small, 

 the third is by far the longest of all the joints. The fourth is short again, the 

 fifth only three-fourths as long as the third, the sixth to the tenth are nearly of 

 the same length, the seventh, however, is a little longer. The joints are almost per- 

 fectly smooth, with the exception of some very small hairs visible only with the 

 microscope. 



The ovigerous legs have the first three joints short, the fourtli and sixth of about the 

 same length, and comparatively long. The fifth (the elbow-joint) is short. The four 

 last joints are almost of the same length, becoming more slender from the first to the 

 fourth. The claw is small and smooth ; the place of the denticulate spines of the 

 four last joints is filled up by short strong knobs of a conical or rounded shape. They 

 are placed on excavations of the chitiuous skin, and with the exception of the two rows 

 on one side, are placed rather irregularly. 



The legs are not very long. Those of the third pair are the longest. The first and 

 the fourth leg of the right side are, in the Challenger specimen, quite rudimentary. In 

 the full-grown leg the fourth and the sixth joint have the same length, whereas the fifth 

 is a little shorter. Of the two tarsal joints the first is longer than the second. The claw 

 is robust, about half as long as the second tarsal joint. 



The only specimen brought home by the Challenger Expedition is a female. Its 

 genital openings are not very large, and are found ventrally on the second joint of all 

 the legs. 



The animal is entirely smooth, and of a beautiful orange colour. 



Habitat. — This species was dredged ofi" Christmas Harbour, Kergueleu, 29th June 

 1874. Depth of the sea, 120 fathoms. 



Observations. — This species cannot easily be confounded with any of the other 

 species ; it is distinguished by being stout, yet comparatively slender, by the form 

 of the proboscis, and the presence of four distinct eyes. It is rather a shallow-water 

 species. 



Colossendeis megalonyx, n. sp. (PI. IX. figs. 1-3). 



Diagnosis. — Proboscis club-shaped, somewhat bent over to the ventral side. Cephalic 

 part of the cephalothorax not distinctly separated. Oculiferous tul)ercle conical, with 

 four eyes. Third joint of the palpus longer than fifth. Body and legs slender. Claws 

 of the legs as long as the second tarsal joint. 



