464 PROCEEDINGS OF THE NATIONAL MUSEUM. vol xxxiii. 



Hesse, in the thirty-seventh article of his series entitled Crustaces 

 rares ou nouveaiix des Cotes de France'* makes the following state- 

 ments in regard to the issuing nauplius of Cecrops: 



The latter, on issuing from the egg, are furnished with three pairs of legs, of which 

 the first is simple and the two others biramose (p. 348). 



Further along he says, while comparing Cecrops with ^' Lsemargus:" 

 In Cecrops the two sexes, and even the young, are very remarkable for the two 

 prolongations, lamellar and rounded, which precede the frontal margin of the cara- 

 pace. Also for the lack of eyes in the adult and esi^ecially in the embryos. (P. 356). 



He adds in a footnote at the bottom of the page: 



This exception, which, I believe, is unique in its kind, is, moreover, the more inex- 

 plicable because if these organs are indispensable in the adults, they are of still greater 

 use to the young, which have to search for a position in which they can be sheltered 

 from dangers, and where they can jjrocure the food necessary to their existence. 



Whether it be true, as Hesse states, that these nauplii have no 

 eyes remains to be proved by other investigators. In view of the 

 serious mistakes which he has made in the same paper, it can not 

 be accepted on his authority alone. It is unfortunate that he is 

 apparently the only one who has ever seen these nauplii. 



SiabfaiTiily CE:CR.0PIN"JE. 



The first thorax segment fused with the head, the second and third 

 segments more or less fused inter se ; the fourth segment with a pair 

 of dorsal plates in both sexes, overlapping the genital segment. Sexes 

 very similar. 



Female. — -Carapace orbicular and strongly arched ; frontal plates 

 more or less completely fused with the carapace and not distinct; 

 grooving similar to that in the Pandarinse. Three free thorax seg- 

 ments, the first two of which are usually fused and furnished with a 

 single pair each of dorsal plates and lateral lobes; the third segment 

 carries a pair of enlarged dorsal plates, which cover the anterior 

 jDortion of the genital segment. 



The latter is as large as or considerably larger than the carapace 

 and furnished with a pair of dorsal plates which entirely cover this 

 segment, as well as the abdomen. 



Abdomen one-jointed, with large anal laminae armed with spines 

 instead of setse; abdomen sometimes with broad wings extending to 

 the lateral margins of the genital segment, in which case the egg- 

 strings are concealed between these wings and the ventral surface 

 of the genital segment {Orthagoriscicola and Cecrops) ; sometimes 

 without wings, in which case the egg-strings are long, straight, and 

 visible like those of the Pandarinae {Philorthragoriscus and LuetJcenia) . 

 First antennae usually two-jointed, rarely three-jointed {Orthagorisci- 

 cola); second maxillipeds with terminal claws. All the legs bira- 

 mose, rami of first three pairs two-jointed, of fourth pair one-jointed 

 and usually enlarged into broad lamellae, armed only with spines. 



"Ann. des. Sci. Nat. (7), V. 



