348 GEOLOGICAL SURVEY OP THE TEEEITORIES. 



found in October and early in November (the 6tli) were pure white, and 

 the appendages to the tail seemed to me to be more divaricate than those 

 of summer, in which those appendages were of a red color.' While the 

 males are easily distinguishable from those of S. texanus by the much 

 greater length and different style of branching of the second antenuse, 

 as well as in the smaller frontal tubercle and the slenderer caudal ap- 

 pendages, the females differ but slightly, but may still be distinguished 

 by the smaller eyes and longer second antenuiie. This sjjecies is dedi- 

 cated to Dr. L. Watson, who has been indefatigable in securing me 

 si)ecimens for examination of this and other Phyllopods. The male dif- 

 fers from 8. similis Baird from St. Domingo in the second antennse or 

 claspers b«-ing much longer and slenderer at tip of the longer branch, 

 while the shorter branch is much narrower. In the female the ovisac 

 reaches to the penultimate segment of the abdomen, while, according 

 to Baird's figure, in 8. similis it scarcely reaches to the end of the fourth 

 segment from the end, and the second antennse are represented as being 

 much larger than in our species. The figures do not exactly correspond 

 with Baird's descrix)tion, for it is nearly impossible to make a charac- 

 teristic drawing of the members of this family, and particularly of this 

 genus." 



Steeptocephalus sealii Eyder. 



Streptoceplmlm sealii Eyder, Proc. Acad. Nat. So. Phil., -p. 200, 1879. 



"In form and size this species resembles 8. torvicornis Waga, but the 

 third joint of the second antennse differs from that species in the details 

 of its structure, and the ovigerous sacs of the female are 

 not blue, as in Waga's animal. The inner branch of the 

 terminal joint of the male claspers is the shortest in- 

 stead of the longest, as in 8. torvicornis; at the interno- 

 anterior margin of the short branch there are two un- 

 equal lobes extending forwards and lying flat against 

 the laminar posterior border of the anterior branch ; at 

 the lower posterior angle of this lamina, or blade of the 

 forward branch, there is a well-marked, somewhat fal- 

 cate process, which fits between the lower lobular pro- 

 cess of the posterior branch and its scythe- shaped lower 

 extremity. The anterior branch crosses the i)osterior 

 at nearly right angles, and for about a third of its 

 length maintains a pretty uniform thickness, and is 

 straight, when it suddenly swells and bends forwards, 

 ph^ahi^sI'ltu^eilM-XT''^^^^ ^^ suddenly contracts and tapers for its remaining 

 after kyder ' " ' two-thirds, eudjug iu a slender, slightly-curved, pointed 

 extremity. The first joint is long and robust, and from its apex ex- 

 ternally the cylindrical, curved, antenniform organ arises, which is 

 about as long as the filiform first antennse. The second joint is very 

 tortuous, and is strongly bent and twisted upon itself. The third joint, 

 which bears the complex terminal appendages, is wide ; the appendages 

 close against each other like the blades of scissors, whilst the processes 

 of their opposing margins interlock as has been already described, and 

 as can be fully understood by reference to the accompanying cut of the 

 head of the male. The front of the head is prolonged into a straight 

 beak, which hangs down nearly vertically between the first joints of the 

 claspers, and is flattened antero-posteriorly, and emarginate at its tip. 

 The antenniform appendage is much longer than in 8. texanus Packard, 

 whilst the terminal branches of the claspers are widely difierent- from 

 those of that species in their shape and relative proportions. The male 



21. 



