CRUSTACEA OF ALABAMA. 21 



short; distal margin of the segments spined ; antennae very short, 6- or 7-jointed, hardly 

 longer Jthan the movable beak ; second antennae much longer, 3-jointed ; palp long, 2- 

 jointed ; mandibles palpate, teeth fine, much as in Calanidae ; palp bi-ramose, second ra- 

 mus very small ; maxillae of moderate size ; maxillipeds large, outer one as in Calanidae; 

 first four pairs of feet bi-ramose, each ramus 3-jointed ; fifth foot small, with two term- 

 inal digitate processes and a seta on either side. The male is at least a third smaller 

 and has longer caudal stylets ; the antennae are modified, but very short. The eyes are 

 wanting in both sexes. This very interesting species was collected in the brackish water 

 of a ditch shaded by high sedges so that the sun could hardly penetrate. I did not find 

 any representative of the genus in the open .waters neighboring, but it is hardly to be 

 doubted that such exist. This species seems quite distinct from Braciya typica of north 

 Europe and may constitute a new genus. 



The only other blind copepod with which I am familiar is Attheyella, which is circum- 

 stanced somwhat as the above. The European B. typica is pelagic ; ours dwells in 

 darkened ditches and seems to furnish another illustration of the effects of seclusion upon 

 the visual organs. 



Ocean Springs, Mississippi. 



It is a matter of regret that nothing can now be added to the original description 

 here .quoted, repeated search having tailed to rediscover it, though probably occurring 

 along the Gulf coast in any appropriate place. 



Genus Amyone, Claus. 



This most interesting genus is still very superficially known, having been noticed by 

 but four writers, the minute size and limited habitat serving to shield it from observa- 

 tion. Claus, who first discovered the genus, applied the name once given to a stage in the 

 cycle of development of the cyclops, saying : 



"The body of this highly remarkable form, represents, in its general form, an inter- 

 mediate stage between the nauplius (cyclops larvae) and the mature Copepods. The 

 oval, almost spherical [sic] form, the slight development of the abdomen, and the enlarge- 

 ment of the anterior thoracic segment recall the structure of the larva, while the almost 

 complete segmentation of the body, the jointing of the antennae and the swimming feet, 

 as well as development of the reproductive organs, make the maturity of the creature 

 certain." (Beitr. zur Kenntniss der Entomostraken.) 



Indeed these more or less discoid forms seem apt illustrations of the possibility of 

 extreme deviation in form and appearance without in a single organ obscuring the evident 

 homologies. The essential alliance with other members of the family could never be 

 questioned. The genus may be characterized as follows : 



Body much compressed ; dorsal margin strongly curved ; head very large, produced 

 and angled below ; antennae 6- to 8-jointed ; antennules palpate, 3-jointed ; second max- 

 illipeds long, chelate at the end ; last thoracic and anterior abdominal segments enlarged; 

 fifth feet leaf-like, large ; in the female composed of two, in the male of one joint ; first 

 pair of feet bi-ramose, each ramus one jointed. No member of the genus is much over 



