PACKARD.] PHYLLOPODS OF NOETH AMERICA. 349 



orj^ans are very feebly armed with a. few sliort spiues and are nearly 

 straight. The cei)halic horns of the female are twisted upon themselves, 

 slightly bent and flattened at their extremities, which are fringed with 

 short hairs. The large lateral, ovoid, pedunculate, apparently gland- 

 ular organs behind the eyes are the same in size and shape in both sexes. 

 The ovigerous sacs are large, nearly half as long as the abdomen, con- 

 ical in form, and contain a great number of ochraceous eggs, more nu- 

 merous and much smaller than those of CMrocephalus hohnanii from thQ 

 same locality. The male is of a beautiful green, deeper about the head, 

 as though saturated with acetate of copper ; the female, on the other 

 hand, is yellow, with a tinge of green, verging to brownish in parts, and 

 is very nearly of the same size as the male, if not a little larger. This 

 similarity in the size of the sexes, with a tendency in the females to be 

 largest, is observed only in 8. torvicornis, as far as I am aware. The 

 two rather long, plumose, tapering branches of the tail are red in both 

 sexes, but of a much brighter red in the female ; more slender in the 

 male. Length, 27°^°^ " (Ryder). 



The main ditierence between S. sealii and texanus is that in the former 

 the claspers are considerably shorter, the 2d joint being much shorter 

 and the 3d joint at base much broader, while the 2d spine on the shorter 

 fork is nearly three times as large as in 8. texanus^ and the longer fork 

 is much slenderer. There are no ditferences in the feet, as I find after 

 careful microscopic examination. 0. sealii also appears to be rather 

 larger. 



Regarding the mode of occurrence of this species we quote from a 

 letter of Mr. W. P. Seals, dated Woodbury, N. J., IiTovember 7, 1879: 



" I have delayed answering your letter until I could assure myself 

 positively as to the present existence of Streptocephalus sealii. Unfor- 

 tunately I did not save any specimens, and the swales in which I found 

 them are now dry with one exception, and in that I cannot find a single 

 specimen. Perhaps the following notes which I have made will interest 

 you. I find them in two places separated by about a mile. One of these 

 is never dry. In this one they disappeared about the beginning of 

 June, and have not yet reappeared. In the other swale they disajjpeared 

 about June Gth by reason of its drying up. In about two weeks after 

 the heavy rains in the latter part of August they had again made their 

 appearance. By October 20th they had again disappeared by reason of 

 the drying up of the swale. ChirocepliaJus liolmanii also exists in this 

 swale, but has not made its appearance since disappearing last June." 



We have also received numerous specimens from Dr. C. F. Gissler, 

 who sends us the following notes : 



'• I send yon now a bottle with Chirocephalus of both sexes. A few 

 specimens of Euhranchipus vertialis might have slipped in also, as they 

 occur together in a very large and deep pond (no fishes seen so far) near 

 Glendale, L. I. With one Eubranchipus about twenty Chirocephalus 

 holmani occur. The males are in average about l-^""" shorter than the 

 females. Color yellowish or reddish or greenish, last 3 abdominal seg- 

 ments with red pigment, the latter confluent, not granular. The 9 has 

 the same second inner lobe as Ryder figures it. Ovary (observed in 

 many 9) extends upward to the 4th pair of bran chi pods Vrom the end; 

 no anastomosis in the post-abdomen. The water of the pond is perfectly 

 clear, colorless, numberous Entomostraca occurring in it. I have seen 

 them in copulation many a time, and can assure you that the tentacles 

 do not come into use as an auxilliary." 



On March 23, 1881, Dr. Gissler visit d the same pond at Glendale 

 and found C. Jiolmani in great abundance, getting two or three dozen 

 at every dip of the net. 



