NO. 3583 COPEPODS — GRICE AND IIULSEMANN 37 



length of the first and second antenna and the structure of the fifth 

 pair of feet — seem insufficient to distinguish E. pseudaffinis Brodsky 

 from E. affinis wSars. No difference is obvious between Brodsky's and 

 Sars' figure of the fifth feet of the female. 



Euaugaptilus species 3 



Figures 231-240 



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

 and fifth thoracic segments fused. Anal segment twice the length 

 of the preceding segment. Rostrum Imoblike , with two short fila- 

 ments. First antenna exceeds furca by last two segments, left 

 antenna geniculate. Endopod of second antenna about four times 

 longer than exopod. Mandible palpus small, imiramous. First max- 

 illa much reduced. Distal setae of second maxilla and maxilliped 

 with numerous "buttons." Swimming feet v/ith 3-segmented exopods 

 and endopods. Total length 6.16 mm. 



Remarks: We are unable to refer this male to a described species 

 but it may be the undescribed male of a known species. The head 

 appendages resemble those of the female of E. rigidus (Sars), but 

 the size of the present male exceeds that of the female. 



Pachyptiliis abbreviatus (Sars, 1905) 



Figures 241-247 



Remarks: Figures of the female of this species, not previously 

 known from the Indian Ocean, are given here. The total length is 

 5.52 mm. 



Pachyptiliis pacificus Johnson, 1936 



Pachyptilus eurygnathus Sars. — Scwell, 1947, p. 239, text-fig. 65. 



Remarks: The species reported by Sewell (1947) as P. eurygnathus 

 is referable to P. pacificus. Sewell's specimen has a 2-segmented 

 exopod on the first feet, w^hich is the same number found in P. pacificus. 



Pontoptilus robustus Sars, 1905 



Figures 248-258 



Diagnosis (female) : Head and first thoracic segment separate, 

 fourth and fifth thoracic segments fused, posterior lateral corner of 

 fifth thoracic segment protruded. Rostrum absent. First antenna 

 consisting of 25 free segments, exceeding furca by last 3 segments. 

 Structure and setation of head and thoracic appendages similar to P. 

 muticus Sars. Total length 8.51 mm. 



Remarks: Although closely resembling P. muticus, P. robustus is 

 distinguished by its larger size, long antenna, and protruding fifth 

 thoracic segment. The female has not been described heretofore. 

 The male was described by Sars in 1905 and later illustrated by him 



