382 KEPOET OF COMMISSIONER OF FISH AND FISHERIES. [38] 



the propodus, and the lower distal angle of the carpus is produced into 

 a sharp spine, but are otherwise nearly like the first pair, except longer 

 and more slender, the chela being nearly a fourth longer, not so stout, 

 and with the digits about as long as the body of the chela. The third 

 pair are imperfect at the tips, exceedingly slender, cylindrical, and un- 

 armed ; the merus about two-thirds as long as the carapax, the carpus 

 very short, and the propodus acicular and apparently about a fourth as 

 long as the merus. The fourth i)air are little more than half as long as 

 the carapax. The fifth pair are nearly twice as long as the fourth, with 

 the propodus and dactylus more than twice as long as in that pair. 



The pleon, exclusive of the telson, is about one-half longer than the 

 carapax, the four anterior somites are each higher than the carapax, and 

 the posterior angles of their pleura are broadly rounded, while the cor- 

 responding angle of the fifth pleuron is nearly right angular but with 

 the apex of the angle rounded. The second, third, fourth, and fifth 

 somites are dorsally carinate, the fourth and fifth most conspicuously. 

 The sixth somite is a little more than a third as long as the carapax, 

 nearly two-thirds as high as long, about one-half as broad as high, 

 compressed but scarcely carinated dorsally, and with a conspicuous, 

 slightly curved, longitudinal, rib-like ridge either side. The telson is 

 shghtly longer than the sixth somite, about as long as the autennal 

 scale, with a broad and shallow dorsal sulcus nearly the whole length, 

 the tip divided by a narrow sinus about as deep as the breadth of the 

 tip, and the edges of the sinus armed with about ten short spines each 

 side. The inner lamella of the uropod is narrow, ovate, a little shorter 

 than the telson, and about three and a half times as long as broad. 

 The outer lamella is nearly a third longer than the inner, proportion- 

 ately as broad, more obtuse at the tip, which is armed at the outer edge 

 with an acutely triangular lamellar tooth. 



The protopodites of the first four pairs of pleopods are composed of 

 two nearly equal segments of which the proximal, or coxa, is not mov- 

 ably articulated with ventral wall of the somite and is consolidated 

 very nearly its whole length with the adjacent pleuron, while the distal 

 segment, or basis, is freely articulated with it and projects considerably 

 below the pleuron. The coxae in the fifth pair are much shorter than 

 in the fourth, but otherwise the fifth pair are similar to the fourth, 

 though shorter and not egg-bearing, the eggs being carried by the four 

 anterior pairs and attached to the coxae only. The outer ramus of the 

 first pleopod is long and slender, as in the succeeding pairs, but the 

 inner ramus expands into a short ovate lamella, bearing near the middle 

 of its anterior edge a small process for mesial attachment, and with 

 both margins below this clothed with long setae. The structure of the 

 pleopods is essentially the same in P. tarda, and the peculiarities are 

 doubtless common to all the species of the genus, and to a considerable 

 extent to the new genus Parapasiphae, about to be described. 



The eggs, which are just beginning to show the pigment of the devel- 



