NO. 15S0. NEW SPECIES OF C ALIO IN.E— WILSON. 609 



chitin knobs, one on either side of the mid line, and the tip of the ter- 

 minal claw shuts in between these when it is closed. Between the 

 bases of these second maxillipeds and the first pair of swimming legs 

 is the furca. Its branches are broadly U-shaped, its base the shape 

 of an ox yoke extending transversely across the median line. 



The base of the U is connected with the center of the yoke by a 

 narrow stem or petiole. 



The first swimming legs are of the usual pattern with a stout blunt 

 spine on the posterior margin of the basal joint; the plumose setaj on 

 the terminal joint are short and weak. 



In the second legs the basal joint of the endopod is very broad and 

 overlaps the exopod considerably, while the spines on the exopod are 

 also large and curved. The rami of the third legs are close together 

 and stand out prominently; the claw at the base of the exopod is very 

 large and stout and strongly curved. 



The fourth legs are four-jointed with five spines; the basal joint is 

 stout and as long as the other three; the spines are all of the same 

 length, except the inner terminal one, which is half as long again as 

 the others. 



The digestive canal is similar to that in the other genera of this 

 family, but the reproductive organs present marked differences. 



The shell glands are comparatively large and of the usual club-shape, 

 the distal three-fifths twice the diameter of the basal two-fifths; but 

 the lumen of the glands shows no signs of a division into cells; on the 

 contrary, it is milky white in color, rather opa(}ue, and homogeneous 

 throughout. 



The semen receptacles and the arrangement for the reception of the 

 spermatophores are also peculiar, as can be seen in fig. 67. 



The semen receptacles are situated at the bases of the median lobes 

 of the genital segment. Each is much enlarged into a flask shape at 

 its inner end next to the median line, the posterior margins of the flasks 

 being connected across the mid line by a narrow tube. Each flasks 

 also sends out posteriorly into the lobe of the genital segment a wide, 

 nipple-shaped process. 



From the tip of the nipple a slender, thread-like tube runs back to 

 the posterior margin of the lobe. The spermatophores are fastened 

 to the posterior ends of the lobes, and their contents are discharged 

 through these tubes into the semen receptacles. 



Total length, 6 mm.; length of carapace, 2 mm. ; width of carapace, 

 2.3 mm.; length of genital segment, 1. 5 mm.; length of abdomen, 2 

 mm.; width of ventral plates on genital segment, 3 mm.; length of 

 egg strings, 5 mm. 



Color a milky white, the plates on the genital segment and the lat- 

 eral wings of the abdomen showing mottled by transmitted light, 

 due to opacpie spots in the inner tissues ; egg strings showing spots 

 of reddish purple when approaching maturity. 



