1897.] 



NATURAL SCIENCES OF PHILADELPHIA. 



399 



ous than those of the Jugor Schar specimen, the posterior one on 

 the median line is the largest and is not so positively united at the 

 base ; the areolations behind the cross are not so elevated, and are 

 but faintly punctate ; in this and in some smaller specimens they are 

 united on the median line ; the tubercles in front of the eyes are not 

 so nearly vertical and are much more angular ; the transverse ridges 

 are not so large but more acute, with slight tubercles at their inter- 

 section with the median line. The abdomen measures at its base 

 8.2 mm. in breadth, its length is 4.25 mm. In 8. Icevis the cross is 

 armed with but a single tubercle on the median line ; this is not 

 vertical as in nodulosa, but horizontal, and when seen from above 

 covers the median notch of tbe front, otherwise the cross is a smooth 

 areolation with slightly elevated transverse extremities. The areo- 

 lations behind the cross are smooth and broadly united at the 

 median line. The tubercles in front of the eyes arise from the mar- 

 gin and form a part of it. The segments of the thorax are incon- 

 spicuously tubercular on the median line. The breadth of the 

 abdomen at the base is 4 mm., length 5.4 mm. 



Synidotea laevis, new species. Fig. 9. 



Numerous specimens from Sta- 

 tions 3,252, lat. N. 57° 22' 20", Ion. 

 W. 164° 24' 40", 29i fathoms, and 

 3,253, lat. N. 57° 05' 50", Ion. W. 

 164° 27' 15", 36 fathoms, respect- 

 ively, differ from S. nodulosa and 

 its near allies by the lack of three 

 tubercles on the head and the less 

 prominent elevations of the thorax. 

 The cross-like areolation between 

 the eyes is smooth with the excep- 

 tion of a single tubercle which is 

 prolonged horizontally over the 

 median notch. The tubercles 

 which in nodulosa arise between 

 the eyes and the front, in this spe- x ?• 



cies arise at the margin and form a part of it. They are less erect 

 than in nodulosa and are more angular. 



Harger says of nodulosa, " Color in alcohol gray, often with 

 brownish transverse markings;" these specimens are gray in alco- 

 hol with a dark, broken, median line on the anterior segments. 



Fig. 9. Synidotea laevis Benedict. 



