Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 209 



AMPHIPODA. 



Family: PHRONIMIDAE. 



Genus : PHEONIME Latreille. 



Phronime sedentaria (Forskal). 



Plate 79, figs. A and B. 



Type: The present depository of Forskal's type is not definitely 

 known. 



Distribution : Known from the Mediterranean, the temperate and 

 tropical waters of the Atlantic, Pacific and Indian Oceans. 



Material examined : Two specimens taken in dredge 10 miles south 

 hj east of Monaco Harbor, Mediterranean Sea, in 900 fathoms of 

 water, April 19, 1927. One specimen from Marcus Pinedo, Monaco, 

 May, 1925. Three specimens dredged in 325 fms., 38 miles S. E. I/2 

 E. of Cape Spartivento, Sardinia, July 22, 1927. One male and one 

 female, dredged down 300 fms., 50 miles S. W. of Cape Malo, Panama, 

 in the Pacific ; bottom depth 1400 fms. 



Technical description : Animal semitranslucent with muscle bands 

 showing through like silver ribbons; head large; body decidedly at- 

 tenuated posteriorly. 



Head : Large, wedge-shaped, widest dorsally, the dorsal surface bi- 

 lobed, moderately convex, entirely covered by small hexagonal facets 

 through which the reddish-brown oculae show clearly. The fronto- 

 lateral surface of the head is smooth, rounded, tapering distally ; the 

 small, ovate, convex eye placed anterolaterally, consisting of an aggre- 

 gate of facets similar to those on the dorsal surface of the head. 



Thorax: The first thoracic segment is very short; the second seg- 

 ment is twice as long as the first; the third segment is one and one- 

 half times the second ; the fourth and fifth segments are subequal, each 

 one and one-half times as long as the third segment ; the sixth segment 

 is one and one-half times as long as the fifth, while the seventh thoracic 

 segment is greatly elongated and narrowed posteriorly, two and one- 

 half times as long as the preceding segment and with the postlateral 

 angle triangulate and bent upward, almost at right angles to the body. 



Abdomen : The first, second and third abdominal segments are much 

 elongated, widening distally, with the lateral margin convex, produced 

 posteriorly and terminating in an acute tooth, that of the first seg- 

 ment rather short, the second tooth longer, and the third tooth very 

 long and acute, with the posterior margin inside it concave and pro- 

 duced to a lesser triangular point near the base of the next segment. 



