182 TWELFTH ANNUAL REPORT. 



which could be compared with the descriptions of D. longiremis 

 were sufficiently concordant. This species ranges, in the eastern 

 hemisphere, from the North sea to the Mediterranean, and could 

 be expected here. It is a very active animal and represents a well 

 differentiated type. 



Genus Temora, Baird. 



Elongate; thorax five-jointed, fourth and fifth segments closely 

 combined ; abdomen with four segments in the male, three in 

 female ; antennas 2i- or 25-jointed ; right antenna of the male 

 geniculate; mouth parts as in Calanus; inner branches of second, 

 third and fourth pairs of feet two-jointed, of first one- or two-jointed; 

 fifth feet with but one branch, prehensile in the male. 



Temora afQnis, Poppe. 

 = r. gracilis, herkick, ms. 



The shallow bays and estuaries along the Gulf of Mexico swarm 

 with a species of Temora but little unlike T, velox. 



The body is much less compact, it being rather slender in both 

 sexes; in like manner the caudal stylets are very much elongate, 

 being nearly as long as in T. longicornis of Mueller, from which it 

 is clearly distinguished by many obvious characters, and which 

 seems to show an approach to Metrida. 



The antenna? in male and female are just as in T. velox, and the 

 fifth feet are little, if at all, dissimilar ; the spine on the second 

 joint in the female is not serrated, however, and the basal joint of 

 the abdomen in this sex has three teeth on either side. The caudal 

 stylets are about six times as long as broad in the female and 

 densely spined, as is the last abdominal segment. The stylets are 

 more slender in the male and have few spines, but the last abdom- 

 inal segment has three larger spines on either side. Inner ramus 

 of the first foot one-jointed. The animal is generally colorless, in 

 autumn at least, but may be variously ornamented with prismatic 

 colors, the most constant of which markings are a band about the 

 stylets and across the thorax and between the bases of the feet. 

 The ova are very numerous and carried as in Diaptonms. This 

 species is littoral in habitat and ranges from salt-water bays to the 

 fresh waters of rivers, along with several varieties of Cyclops^ 

 Sida, etc. 



