194 



THETIS SCIENTIFIC RESULTS. 



become gradually less as the proximal end is approached. The 

 inner margins of the sixth and seventh joints are clothed with 

 numerous stout setse, many of which are biserrate, the teeth being 

 a little longer than broad at the base, and are confined to the 

 distal half or third ; there are two or three long smooth bristles 

 at the extremity of the seventh joint. 



Obtained off Botany and Wollongong, in 50 to 80 fathoms. 



MACRUEA. 



Group NORMALIA. 



Tribe SYNAXIDEA. 

 Family SCYLLARID^. 



ARCTUS, I)a7ia. 



ARCTUS CRENATUS, sp. nov. 

 (Fig. 14.) 



Station 57. 



The carapace measures 5*2 mm. in length, its breadth anteriorly 

 is 6-5 mm., between the orbits 3-5 mm., and at the posterior 

 border 5 "3 mm ; each lateral margin is 

 armed with a series of fourteen obscure 

 denticles, usually disposed in pairs ; the 

 posterior tooth of each pair is small 

 and sometimes wanting ; there are five 

 denticles in advance of the shallow 

 cervical incision ; the remainder occur 

 at equal distances apart, and extend to 

 near the posterior end of the carapace. 

 The front has a small obtuse rostriform 

 process, surmounted by a tubercle ; the 

 margin has a raised border, which is 

 continued on each side of the process 

 along a wide sinus to a point external 

 to the bases of the first antennte ; the 

 border is here abruptly curved inwards, 

 and terminates in a small tubercle ; 

 from the latter to the external angle of the orbit the margin is 

 .slightly deflexed. 



Carapace x 5. 

 Fig. U. 



