334 GEOLOGICAL SURVEY OF THE TERRITOEIES. 



Some males were attached to females much larger than themselves. I 

 was told that the Arfemia appears iu the spring, from the middle of 

 Apiil to May 1, and disappears during very cold weather in autumn. 



Artemia Guildingii Thompson. 



Artemia Guildingii Tlaompson. Species haec, reperta in India Occidentali, delineata 

 est a Domino Thompson in 'Zoological researches' sed non descripta, necnon 

 satis acourata delineata est. 



Artemi Guildingi, Thompson Zool. Research, Fasc, 5, t. p. 11. 



Hah. — In insula "St. Vincents," in India Occidentali; Rev. L. Guild- 

 ing. 



"This species is figured by Mr. Thompson, but not sufficiently 

 described to enable me to give a good diagnosis of it. It was found at St. 

 Vincents, in the West Indies, by the Rev. Lansdowne Guilding, by whom 

 its natural history was intended to have been more fully detailed. The 

 body seems to be thick and the abdomen shorter than the body and 

 stout; the caudal segment does not appear to be lobed nor setigerous. 

 The cephalic segment is conical in shape, and the superior antennai, 

 according to Mr. Thompson's figure, consist each of four joints. The 

 ovarian sac consists, according to the same authority, of two articula- 

 tions." (Baird's Monograph of the Family Branclii^odidce. Annals and 

 Mag. Nat. Hist. 2d ser. xiv, 1854, p. 226). 



Genus BRAl^CHINECTA Verrill. 

 Plates IX, X. 



Brancliipus Milne-Edwards, etc. (in part). 



Branckinecta Verrill, Amer. Journ. Sci. 2d ser. xlviii, 250. Sept. 1869. 

 Proc. Amer. Assoc. Adv. Sc. .July, 1870. 



Body rather long and slender, but stouter than in Artemia; head 

 ra^ther small, but larger than in Artemia; 2d antennte of male (claspers) 

 with a knob on the basal joint as in Artemia; the claspers simple, quite 

 persistent in form iu the different species, not elbowed, 2-jointed, with 

 joints cylindrical ; 1st joint slightly bent ; the 2d joint not bent on the 

 first, round, and about one-half as thick as the basal joint. The 2d an- 

 tennse of the temale are rather long and slender. Labrum large and 

 long, extended beyond the closed mandibles ; the end is square, with a 

 nipple-like projection in the middle. Eleven pairs of legs, which are 

 shorter and broader than in Artemia. The gills are usually larger, the 

 flabella moderately large, and quite regularly oval externally; the 1st 

 endite and the three following are much as in Artemia., but the first 

 is not so distinctly divided distally into a secondary lobe. The 5th 

 is decidedly rectangular in outline, the distal edge being straight, some- 

 times hollowed out, with rather shorter setaj than in Artemia; the 6th 

 endite in all the legs is much shorter than in Artemia^ being short and 

 broad and well rounded at the end, with rather short setse. 



The abdomen has nine segments, and is as long or a little longer 

 than the head and thorax together; the cercopoda are much longer than 

 in Artemia^ and equal in length to the terminal segment, which is much 

 shorter than in Artemia; compared with Brancliipus and succeed- 

 ing genera they are small, short, and conical. The penis is deeply 

 divided into two long slender curved branches. The ovisac is cylin- 

 drical and remarkably long and slender; in B. coloradensis nearly half 

 as long as the abdomen, and deeply cleit at the end. 



