PYCNOGONIDA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 165 



Ocular tubercle stout, conical, without eyes. 



Legs slender, covered with rows of very minute setee ; terminal claw long. 



The Body is fairly robust, without any trace of segmentation, and the lateral 

 processes are widely separated. The cephalon is small, and at its posterior border, not 

 quite clear of the first pair of lateral processes, lies the ocular tubercle. This is a very 

 short but stout and pointed process, without any trace of eyes. The abdomen is slender 

 and articulated to the trunk. 



The Proboscis is considerably longer than the body, and is bottle-shaped that is, 

 it is narrow at the base and for about a third of its length, when it becomes consider- 

 ably enlarged. At about its distal third it again becomes slightly constricted, and 

 terminates in three lobes corresponding to the sides of the mouth. It is irregularly 

 covered with minute setae, and movably articulated to the trunk. 



The length of the proboscis is. 20 mm. ; trunk, 13 mm. ; abdomen, 2 mm. ; width 

 of trunk, 7 mm. 



The Palps arise ventro-laterally at the extreme end of the trunk. The first joint, 

 though small, is unusually large, and twice the size of the second, which is annular. The 

 proportions of the other joints are 11, 1'3, 7, 4, 575, 1'8, 2'5, 2'5. 



With the exception of the first two joints, the entire appendage is setose throughout. 

 On the third joint they are scarce and hardly noticeable, but become more numerous on 

 succeeding joints. From the sixth they are most abundant, always small, and thickest 

 on the ventral aspect of the appendage. On the fifth joint, at about three-quarters of 

 its length, there is a distinct swelling externally and a faint constriction, a peculiarity 

 which seems to prevail throughout the genus. 



The Ovigers lie immediately behind the palps, and the processes on which they arise 

 are quite close to the middle line and seem to have pushed the palps off the body. 

 Each might quite justifiably be taken for an eleventh joint ; the first three, properly 

 so called, are quite small and approximately subequal. The proportions of the next 

 three are 17, 7'5, 15'2. The four terminal joints present no exceptional peculiarities 

 in general appearance, but the denticulate spines are arranged in five rows altogether 

 a single row of large spines separated by an interval from a second which contains 

 nearly double the number of smaller spines, another interval, and then three more rows 

 not so regular as the other two. In the ninth joint these latter rows are very irregular. 

 The spines themselves are of the characteristic type a more or less cylindrical base 

 bearing a flattened blade, the two being subequal in length. In the present specimen 

 they are so much worn that no details as to their margins can be observed. 



The Legs are slender and are 110 mm. in length. The three coxse are small and 

 subequal, the first being very closely articulated to its lateral process, the proportions 

 of the remaining joints being 32, 27, 22, 11, 7, and the terminal claw about 5. The 

 limb is rather liberally covered with very minute setae, which are arranged in rows. The 

 lateral line is distinguishable throughout. The left femur of the first pair of legs and the 



(ROY. soc. EDIN. TRANS., VOL. XLVI., 185.) 



