A New Species of Spirontocaris 135 



The telson is 0.18 of the length of the specimen. It bears six 

 terminal spines, the outer pair (one on each side) are short and stout, 

 the intermediate pair are four times as long as the outers and the median 

 pair do not reach quite to the distal end of the intermediates. On the 

 dorso-lateral surface of the telson there are in three specimens four and 

 in the other two five pairs of stout equidistant spines. The dorsal surface 

 has many long setae scattered over it. 



The squame of the antenna extends to the middle of the large flagel- 

 lum of the antennule and is widest at about its middle. The end of the 

 squame is rounded and serrate. Its inner border bears long setae. The 

 spine of the squame is stout and straight and reaches just to the distal end 

 of the squame. The first endopodite is large, its end being triangular 

 with its point in the middle of the second endopodite. The distal end of 

 the second endopodite is also triangular and its medial side bears setae. 

 The third endopodite is stout and bears many distal setae. Distal end 

 of exopodite bears one long anteriorly pointing spine. Flagellum about 

 30 mm. long. 



First protopodite of antennule split down two-thirds of its length, 

 the lateral spine so formed reaching the distal end of the second protopo- 

 dite ending in a long tapering spine that points slightly laterally. The 

 main portion of the protopodite bears at its distal end four (two speci- 

 mens) or three (three specimens) heavy spines. These spines reach the 

 middle of the second protopodite, the most lateral one is needle shaped, 

 the next is like an equilateral triangle, and the remainder are needle 

 shaped. The second protopodite is stout, its disto-lateral spine is sharp 

 and points somewhat laterally reaching the middle of the third proto- 

 podite. The third protopodite consists of two triangular pieces over- 

 lapping, the median one being more sharply pointed than the other. The 

 flagellum consists of about twenty segments, and narrows gradually to 

 the end, bearing on its medial surface many long setae. The small 

 flagellum is about five mm. long. 



The mandible has two prominent cusps separated by a deep groove. 

 The medial one shows slight indentations; palpus is stout, narrowing 

 toward end with external side longest. Teeth are very small. Exopod 

 is two jointed, second joint is rounded and bears setae; it is a little 

 shorter than the palp. 



Eye reaches distal quarter of rostrum, fascetted part almost globular, 

 stalk longer than broad. 



Exopod of first maxilla bears two spines, outer one small, and the 

 other stout. Sides of endopodite almost parallel giving a squarish appear- 

 ance not seen in other species. Medio-distal end bears three to four rows 

 of spines, disto-lateral edge and rest of medial with long plumose setae. 



