ISOPODS OF NORTH A>;ERICA. 



315 



Fig. 344.— Cilic.ea caudata 

 (MALE) (After Moore). 

 X 53. 



On the authorit}' of Dr. H. F. Moore, who has collected specimens 

 of this species, Dynamene hermudensis represents the female of Cilicsea 

 cai(il((fa (Say). The two foi'ms are always found associated tog-ether. 

 Only the female of the one is known and the male of the other. I unite 

 the two with nmch hesitancy, for, inasmuch as 

 the males of several species of Dynamene are 

 known, the male of this form may not be tlu^ 

 one referred to it by Doctor Moore. 



Descrijption of male. — Body very slig-htly in- 

 creasing in width from the head to the abdomen, 

 a little more than twice as long as wide from the 

 anterior margin of the head to the extremity of 

 the abdomen, 4 mm. : 9 nnn. The uropoda ex- 

 tend 1 mm. beyond the tip of the terminal seg- 

 ment, making the entire length of the body with 

 the uropoda 10 mm. 



Head three times as wide as long, 1 mm. : 

 3 mm., with a frontal l)order arising between 

 the e3'es, and produced in a small median point. 



The eyes are small, round, composite, and situated in the post- 

 lateral angles of the head. The tirst pair of antenn;e have the 

 bai^al article long and stout; the second is half as long as the 

 first and equally wide; the third is one and a half times 

 as long as the second and about half as wide. The 

 flagellum is composed of eight articles. The tirst an- 

 tennae extend to the posterior margin of the tirst tho- 

 racic segment. The second pair of antenna' have the 

 basal article short; the second is about twice as long as 

 the first; the third and fourth are about equal in length 

 and each is a little longer than the second; the fifth is 

 a little longer than the fourth. The flagellum is com- 

 posed of fifteen articles. The second antenna; extend a 

 little beyond the posterior margin of the second thoracic 

 segment. The maxilliped has a palp of hve articles. 

 The palp of the mandibles is composed of three articles. 

 The frontal lamina is large and conspicuous, the pos- 

 terior portion forming a thick raised margin in the 

 shape of an inverted v. 



The tirst segment of the thorax is nearly twice as long as any of 

 those following. The lateral parts of all the segments are bent down- 

 ward, forming an angle with the dorsal part of the segment. The 

 epiniera are not distinct from the segments, but are indicated by a 

 depression on either side of the segment a little distance within the 

 place where the lateral part of the segment bends downward. The 



Fk;. 345.— Cil- 

 ic.ea CAUDA- 

 TA. Maxil- 

 liped. x51f. 



