222 COLLECTIONS FROM MELANESIA. 



57. Pilumnus semilaiiatus. (Plate XXII. fig. B.) 



The carapace is not very convex ; a few granules exist near the 

 antero-lateral teeth ; its anterior part (i. e. the frontal and post- 

 frontal regions and parts adjacent to the antero-lateral margins) is 

 clothed with longish hairs, which are altogether absent from the 

 gastric, cardiac, and branchial regions, which are nearly plain and 

 smooth ; the cervical suture only is distinct in some specimens ; 

 the frontal lobes are scarcely defined by a median notch, and are 

 very little prominent ; the antero-lateral margins much shorter 

 than the postero-lateral, and armed with three teeth, the first of 

 which is blunt and is itself crenulated, the second dentiform, and 

 the third very small ; no tooth exists at the exterior angle of the 

 orbit, but immediately behind it are sometimes one or two small 

 granules ; the orbital margins are rather obscurely denticulated ; 

 tbe pterygostomian regions nearly smooth ; all the postabdominal 

 segments are distinct; the basal antennal joint barely reaches to 

 the subfrontal process ; the merus-joint of the outer maxillipedes is 

 nearly quadrate. The chelipedes are of moderate size ; arm with a 

 small spine near the distal end of its upper margin; wrist granu- 

 lated externally, the granules inconspicuous, and with a small spine 

 on its inner margin ; palm also granulated above and externally, tbe 

 granules large and showing a tendency to disposition in longitudinal 

 series, and becoming more crowded toward the lower margin ; fingers 

 brownish, the coloration not extending over the palm : legs slender 

 and proportionately rather long. Length of the largest perfect 

 specimen rather over 4 lines (9 millim.), breadth 5 lines (nearly 

 11 millim.). 



Three small specimens (a male and two females) are in the 

 first collection, but unfortunately without definite locality ; the label 

 with particulars respecting habitat (if there existed any) was lost 

 when the bottle (Xo. 123) came into my hands. In the second 

 collection two males from Prince of Wales Channel, 7-9 fms. 



Either the left or the right hand may be the larger. 



There are in the collection of the British Museum a male and a 

 female specimen preserved dry, and collected by Mr. J. Macgillivray 

 (H.M.S. 'Rattlesnake ') off Cape Capricorn, in 15 fathoms, on a muddy, 

 sandy, and shelly bottom, that I refer to this species ; also an adult 

 male from Moreton Bay (piirchased). The coloration of Dr. Cop- 

 pinger's spirit-specimens is purplish, that of the dry examples reddish 

 brown. 



This species bears some slight resemblance to P. monilifera, Has- 

 well, from Tasmania (vide Cat. p. (35, pi. i. fig. 3), which, however, 

 has the carapace and limbs covered with a short close pubescence, 

 and the front much more deeply incised, the carapace more granu- 

 lated. 



58. Pilumnus seminudus. (Plate XXI. fig. C.) 



This species resembles the foregoing in having the gastric, cardiac, 

 and branchial regions of the carapace smooth and naked ; but it may 



