36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Remarks: There is reasonably good agreement between the present 

 specimen and E. Jacilis (Farran), a species also found in these collec- 

 tions. They differ chiefly in the structure of the mandible (no rami in 

 Euaugaptilus species 1, biramous in E. Jacilis), first maxilla (three large 

 and one small setae on the exopod in Euaugaptilus species 1 , thi-ee large 

 setae on exopod of E. jacilis) , and third pair of feet (enlarged terminal 

 exopodal segments in Euaugaptilus species 1, usual type of terminal 

 segment in exopods in E. jacilis) . The present specimen could possi- 

 bly be an abnormally developed E. jacilis and we have therefore not 

 considered it a new species. 



Euaugaptilus species 2 



Figures 225-230 



Diagnosis (male) : Head and first thoracic segment separate, fourth 

 and fifth thoracic segments fused. Posterior lateral comer of fifth 

 thoracic segment rounded. Abdomen consisting of five segments, 

 anal segment very long, longer than fm^ca. Large rostrum rounded. 

 Rostral filaments slender. Right first antenna reaching anal segment; 

 left first antenna geniculate. Exopod of second antenna 8-segmented, 

 small, extending to two-thirds of first segment of endopod. Man- 

 dible blade with four strong and one slender tooth of about the same 

 length, seta small. Mandible palpus biramous. First maxiUa much 

 reduced; first endopodal lobe with one spine, second endopodal lobe 

 with one spine, third lobe absent; fused second basal segment and 

 endopod with one seta; exopod with two rather strong setae; external 

 lobe without setae. Nmnber of setae on lobes 1-6 of second maxilla: 

 1 and a small process, 1 (?), 2, 2, 2, 1, respectively. Number of 

 setae on first 5 lobes of maxilliped: 1, 1, 2, 2, 2, respectively. Ex- 

 opods and endopods of first to fifth pair of swimming feet 3-seg- 

 mented. Seta on second basipodal segment of fifth foot short; inner 

 margin of second exopodal segment of right fifth foot with process near 

 proxhnal corner; external spmes of first and second exopodal segments 

 with small knoblike protrusions apically near their base. Total 

 length 3.7 mm. 



Remarks: The structure of the mandible and the first maxilla as 

 well as the relatively long genital segment suggest a close relationship 

 of Euaugaptilus species 2 to E. affinis Sars. The one male specimen 

 found differs from Sars' description (1924-25) of the female in a 

 reduced number of spines or setae, respectively, on the first inner lobe 

 and the outer lobe of the first maxilla, second maxilla and the maxil- 

 liped. Also, this male (total length 3.77 mm) is smaUer than the 

 female of E. affinis (5.40 mm). The male of E. affinis is imdescribed. 



The characteristics pointed out by Brodsky (1950) to distinguish 

 his Euaugaptilus pseudaffinis from E. affinis — i.e., differences in the 



