412 



THETIS SCIENTIFIC RESULTS. 



arranged in pairs ; the third joint bears two pairs, one median 

 and the other distal ; the fourth joint has five or six spines 

 arranged irregularly around the somewhat swollen distal 

 extremity ; fifth joint with four equidistant spines, of which the 

 median pair is the largest ; sixth joint without spines ; seventh 

 slender, tapering, and about four times as long as the diameter 

 of the preceding joint. 



The second joints of the fifth to seventh pairs 

 of legs are armed laterally and inferiorly with 

 short conical spines. The length of the second 

 joint of the fifth leg is about twice that of the 

 seventh ; the third joint equal in length to the 

 two succeeding ; sixth joint as long as the third; 

 seventh one-fourth shorter than the sixth, slightly 

 curved and truncated at the extremity. 



The pleopods are of the usual form. The 

 uropods are lanceolate in shape and bear two 

 rows of submedian denticles. 



One specimen of this remarkable species was 



found in the collection. Unfortunately the 



second antennae are wanting. Notwithstanding 



Fifth leg. this deficiency, the species appears to be sufli- 



Fig. 116c, ciently distinct to warrant its description as new. 



It was obtained off Botany Bay in 50 to 52 fathoms. 



ARCTURUS NODOSUS, sp. nov. 

 (Figs. 117 a-d.) 

 Stations 35, 37. 



Adult female : — Body 8 mm. in length. Frontal margin of 

 cephalon slightly excavate ; there are two erect spines on the 

 upper surface, situated a little behind the transverse line of the 

 eyes ; other scattered spinules are present on the lateral margins. 

 The first and fourth peraeon segments each carry four slender 

 equidistant spines; the second and third are furnished with six, 

 the fifth, sixth and seventh with four. 



The caudal shield bears six paired spines ; the subterminal pair 

 is long and slender; all the s^jines are weak and easily bent or 

 broken. 



Cephalon as long as broad; first peraeon segment sliort; second 

 and third equal, twice as long as the first and about one-tliird 

 longer than the fourth ; fifth to seventh segments subequal, very 



