CRUSTACEA OF ALABAMA. 9 



Temorella affinis, p «fP f - 



(Plate I, Figs. 3, 4. 5, and 6. Plate II, Figs. 9-12.) 



Temora velox Jii.lj. , Pars De Crust, ex ordin. tribus Cladoc. Ostrac. et Copep. 



Tcuwra affinis, Poppe, Ueber eine neue Art Temora, Abh. naturw. Vereins zu Bremen. Tome VII, 1880. 

 Temora affinis, Claus, Ueber d. Gattungen Temora u. Temorella, Sitzb. k. Akad. Wien, LXXXIII, 18S1. 

 (var. ?) Eniytanora hirundo, Giesbkecht, Kieler Freilbend. Copep., 1 88 1 . 



Form rather robust, about 1 .60 mm. long, variously ornamented with colored markings; 

 head separated by an obvious suture from the thorax, rounded anteriorly, with small 

 forked beak ; antennae about as long as the thorax, 24-jointed, the 12 basal joints being 

 quite short and uniform, in the right male antenna geniculated and thickened beyond the 

 1 2th, the geniculation being between the 18th and 19th, the 17th and 18th segments fur- 

 nished with comb-like or file-like plate against which plays a similar shorter plate on the 

 19th; the antennules short, 3-jointecl ramus with 12 setae, 2-jointed ramus with about 

 15 ; jaw with 8 acuminate teeth and a small spine ; mandiblar palp with a 2-jointed and 

 4-jointed ramus, the former with 7 terminal and 4 lateral setae ; maxilliped very small, 6- 

 jointed ; first pair of feet with the inner ramus 1- the other 3-jointed, remaining swim- 

 ming feet, 2- and 3-jointed ; fifth foot in the female with 3 joints (apparently 4), the 

 basal bearing a single external spine, the second, two external spines and a strong inter- 

 nal process, the terminal joint a long pectinate seta and a small spine ; the fifth feet of the 

 male both 4-jointed, the right terminating in a long, irregularly excised claw and 

 the left in a fan-shaped expansion with a central spine. The abdomen is 5 -jointed in the 

 male and terminates in two long slender stylets, but sparsely beset with bristles along 

 the inner margin, while in the female the abdomen is 3-jointed and the shorter stylets are 

 densely spinous and bear numerous fine setae medianly. The second segment of the 

 abdomen in the female is produced into a spiniferous process with small spines on its 

 sides. The caudal stylets are about six times as long as wide in the female and nearly 

 eight times in the male, the preceding segment being densely covered with short spines 

 in the former, while in the latter there is on either side a cluster of longer stylets. The 

 eggs are carried in a large spherical mass beneath the abdomen as in Osp1ira7iticum 

 (Potamoichetor.) The one-jointed ramus of the first foot bears seven setae, the terminal 

 joint of the other ramus, five setae and three spines ; the second segment of the inner 

 ramus of second and third feet bears six seta, its predecessor three, while the terminal 

 segment of the outer ramus carries five setae, one long, serrated, apical spine and a short 

 external spine ; the fourth foot has but five setae on the apical segment of inner ramus 

 and five setae, a serrated spine and two small spines upon the opposite branch. 



This species was first noticed in America by the writer, in an appendix to his paper 

 in the 12th annual of the State Geologist of Minnesota. Careful study of abundant ma- 

 terial since then shows the identification well-founded, although a few slight differences 

 between this and the north European species can be detected which are by no means so 

 great as the variations in the figures of the several European authors who have described 



