118 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



12. Pseudione galacanthse, n. sp. 



Plate V. Fig. a-'^ i. 



Five adult females and the same number of males have been transmitted, 

 (Compare " Habitat.") 



a. Female. 



The body about li times longer than broad. 



Head. It is somewhat broader than long, fused with the considerably- 

 curved tirst thoracic segment and encircled forward to the antero-lateral angle, 

 while its anterior margin is slightly curved ; the frontal border is rather nar- 

 row and turned somewhat upwards ; the dorsal surface is slightly convex. The 

 antennulae (Fig. 2 b, a) are in contact anteriorly, posteriorly they are separated 

 by a small, triangular frontal plate (p) ; they are of about medium size, 3- 

 jointed; the basal joint is rather large, thick, the second shorter and more 

 slender, the third very small, terminating in an exceedingly short bristle. The 

 antennte (b) are 4-jointed, rather short ; the basal joint is very large, forming 

 almost an oblique oval, yet the inner margin is almost straight, the outer very 

 convex, and the second joint originates from its extero-anterior angle ; the second 

 and third joints are short and slender, the fourth very small, terminating in an 

 exceedingly short bristle. The frontal plate is already mentioned. The labrum 

 is very broad ; the hypopharynx is oblong-triangular with rounded vertex. 

 Mandibles (d), maxillulaj (e), and maxillae (/) do not present any interesting 

 peculiarities. The left maxilliped is shown in Figure 2c; the palp is very 

 conspicuous, with some hairs, but not jointed. The border behind the maxiUi- 

 peds is well developed, with numerous small, irregular protuberances, and only 

 one pair of processes which are long and distally narrow. 



Thorax. The four anterior segments with ovarian bosses, which are low, 

 and occupy about two thirds of the lateral margin of each segment ; the pleural 

 plates which occupy the remaining one third of the margin, are short or narrow. 

 The three posterior segments without bosses, but the pleural plates occupy the 

 entire margin and are developed as laniellse, increasing gradually in length and 

 turning more backward from the fifth to the seventh segment ; besides they are 

 lon-er°on the convex than on the other side of the animal. The legs are rather 

 stout (Fig. 2 d and Fig. 2 e) ; the second joint about as broad as long, owing to 

 the fact that on the whole outer side it is mucli expanded, with the outline 

 almost semicircular ; the fourth joint with a keel on the inner margin, and two 

 short, knot-like keels are found on the same margin of the posterior, but disap- 

 pear on the anterior pairs of legs. The first left leg, with its marsupial plate, 

 is shown in Fig. 2d; the plate has on the lower side a broad and high trans- 

 verse keel, and on the upper side a structure similar to that in Munidion (see 

 above). Only the last segment on the ventral side with numerous small in- 

 cisions and between these low fleshy projections ; this structure is found both 

 at the anterior and the posterior margin of the segment. 



