ISO PODS OF NORTH AMERICA. 



303 



Fig. 325. — Dynamene 

 MooREi (After 

 Moore). 



DYNAMENE MOOREI, new species. 



Dynamene perforata Moore (female), Bull. U. 8. Fish Commission, XX, Pt. 2, 

 1902, pp. 178-174, pi. X, fi<i. 10. — Richardson (female). Trans. Conn. Acad. 

 Sci., XI, 1902, pp. 291-292. 



Localities. — Culehia, Porto Kico; Bermudas. 

 Found on niiuigrovo I'oots. 



This species is wliat Dr. Moore considered to be tiie female of 

 Dynamene perforata. Upon examining the specimens 

 of Dynamene perforata (females) I found one to be a 

 male.« 



Body oblong-ovate, about twice as long as wide, 2 

 mm.: ^ nun. 



Head about twice as wide as long, with the frontal 

 margin rounded and pi'oduccd in a small median point. 

 ?]yes large, composite, and situatcnl in tlu^ post-lateral 

 angles of the head. First pair of antenna' have the 

 first and third articles of the peduncle about equal in 

 length; the second shorter than either. Theflagellum 

 of eight articles extends to the posterior margin of the tirst thoracic 

 segment. The second j)airof antenniv, withaflagellumof twelve arti- 

 cles, extends to the posterior margin of the 

 second thoracic segment. 



The first segment of the thorax is about 

 one and a half times longer than any of the 

 following segments, which are subequal. 

 The seventh segment is produced backward 

 in two small, rather obscure points, close to- 

 gether, one on either side of the median line. 

 The abdomen is composed of two segments. 

 The second or terminal segment bears four 

 small, rathei' obscure tul)ercles on the an- 

 terior convex portion. This segment is some- 

 what triangular in shape, with the apex 

 notcluHl and the sides folded under, forming a 

 kind of funnel-shaped extremity. 

 The uropoda are lai'gc and broad, similar in shape and size, with the 

 extremities rounded and the cxttM-ior mai-gins crenulate. They extend 

 but little beyond the extremity of the abdomen. 



Both sexes of this species are known, the males and females being 

 sinnlar. 



This species is named for Dr. H. F. Moore. 



« Since my manuscript was sent to press, Doctor Hansen has returned spec-imens 

 of Di/namene perforata Moore, which he horrowed from the U. S. National Museum. 

 Two specimens, considered by Dr. II. F. Moore to be the females of that species, 

 were sent him. Iain irratified to iind that he has labeled one " immature male," 

 and the other "adult male." 



Fiii. ,SJ6.— Dynamene mookki. 

 Second i>i,eopoi> ok male. 

 X 77i. 



