PACKAKD.] PHYLLOPODS OF NORTH AMERICA. . 327 



Mr. Thompson, in his Zoological Eesearches, remarks : '' I received 

 this species of Apus together with the Artemia Griiildingii from the West 

 Indies, and having as yet no details must leave its history in the hands 

 of its distinguished discoverer. It is of a light blackish color, the clyi:)eu8 

 translucent, almost membranous, and shorter in proportion than in any 

 of the known species, with the extreme branch of the anterior member 

 extremely long." Unfortunately we have no further history of this 

 species from its discoverer, the Eev. Lansdowne Guilding, but the short 

 square-shaped carapace and the extreme length of the external branch 

 of the first pair of feet sufficiently distinguish it. 



We add the following description of an Asiatic species, briefly de- 

 scribed by us in 1871. 



Apus hemalayanus Packard. 



Plate XVI, figs. 5, 5o. 

 Apus Mmalayanus Pack. Amer. Journ. Sc. 1871. 



Several females. — Carapace two-thirds as long as the body, with from. 

 14 to 16 teeth on each side of the sinus on the hind edge, the last tooth 

 on the extreme end of the shield being more prominent than usual. 

 Eyes and post-ocular tubercle small, as in A. cancriformis ; mandibular 

 muscular eminence behind also as in A. cancriformis ; frontal doublure, 

 hypostoma, and appendages as in A. cancriformis. The 1st pair of feet 

 closely resemble those of A. neivberryi in the form of the long knife-like 

 scale, as well as in the form of the gill and accessory gill (flabellum) ; 

 the length of the 5th endite of the first pair of feet is 19"""., and it is 

 composed of from 72 to 80 subjoints, while A. cancriformis has about 50, and 

 A. aqualis 42. Diameter of the ovisac is nearly 4""" (.15 inch). There 

 are the same number of spines on the abdominal segments as in A. can- 

 criformis, and the spines on the telson have the same arrangement, 

 there l^eing on the upper side four spines at the insertion of the stylets, 

 the 4th being minute; a single spine on the hind edge projecting over 

 the sinus in the middle of the hind edge, which is deeper and narrower 

 than in A. cancriformis; there is also a minute spine on each side of the 

 sinus as in A. cancriformis, and two minute spmes at the bottom of the 

 sinus. Near the base of the telson, on each side, is an oval depression, 

 with the posterior side raised and bearing three teeth, just as in A. can- 

 criformis. The telson, however, is considerably longer than in A. can- 

 criformis, being two-thirds as long as wide, while in the latter it is only 

 one-half as long. On the under side of the telson the hind edge is 

 rather more deeply incised than in A. cancriformis, and the edge is much 

 more spiny, there being about 7 spines on each side. 



The cercopoda or caudal spines are finely spinulated, almost hairy, as 

 in A. cancriformis, in this respect differing from all the American species. 



Total length of body, 25"^". 



Greatest length of carapace, 16""". 



Of the keel, 11"^-". 



Distance from anterior end o£ the keel to the front edge of the head, 



Length of abdomen beyond the hind edge of carapace, 9""". 



Length of caudal appendages, 28""". 



Number of segments beyond the hind edge of the carapace, 19 (in A, 

 cancriformis, 14). 



Number of segments behind the last pair of limbs, 7 (in A. cancri- 

 formiSj 6). 



