188 DR. W. T. CALMAN ON THE MACRUROUS [Mar. 6> 



ii. Systematic Notes and Descriptions of New Genera 

 and Species. 



Family PaljEmon id^e. 



PALiEMON MOOREi Caiman. (Plate XI. figs. 1 & 1 a.) 



P. moorei Caiman, Proc. Zool. Soc. 1899, p. 709, pi. xl. 

 figs. 20-24. 



The nvxmerous and excellently-preserved specimens of this species 

 which Dr. Cunnington has brought home enable me to add some 

 further details to the desci'iption which I formerly gave. Of 18 

 specimens collected only two ai-e males. This is a somewhat 

 remarkable fact, since in this genus, as Coutiere remarks, it is 

 rare for the females to be as numerous as the males. The largest 

 specimen is an ovigerous female, 27 mm. in total length. The 



males are a little smaller. The teeth of the rostrum are " ,?" " . 



The second pair of pei'feopods in the females (Plate XI. figs. 1 & 

 la) difier from those of tlie male formerly figured, and from those 

 of the two males in the pi-esent collection, in having two low 

 rounded teeth or tubercles on the inner edge of each of the fingers 

 close to the proximal end. The males do not differ from the 

 females in the length or stoutness of the chelse. The carpus and 

 hand are rough with minute sharp granules or spines, which were 

 not well shown in the figure formerly given. There is some little 

 variation in the relative lengths of the segments of this limb, as 

 the following measurements (in millim.) show : — 



Merus. Carpus. Palm. Fingers. 



Female 4-0 4-5 3-6 3-9 



4-3 4-9 4-2 3-7 



„ 4-7 5-0 3-5 3-9 



„ 4-5 4-5 4-5 4-3 



Male 2-9 3-3 2-5 3-0 



3-6 3-6 2-3 3-1 



The mandible carries a palp which, although short (about half 

 the length of the incisor process), is composed of three distinct 

 segments, and in all other respects the species confoi'ms to the 

 definition of the genus* to which I have referred it. 



As it is by no means easy to determine what are the affinities 

 of this species among the very numerous and closely allied species 

 of the genus, I have submitted a specimen to Dr. J. G. de Man, 

 whose competence to pass judgment on this point will not be dis- 

 puted. "With his accustomed courtesy. Dr. de Man sent me a 

 long letter dealing with the subject, and with his permission I 

 quote some of his remai'ks. After noticing that F. moorei 

 is, without doubt, the smallest species of the genus, and that it 

 has, at first sight, quite the general appearance of some species of 



* I follow Ortmaiiii, de Man, and the majority of recent authors in retaining the 

 name Palamon for this genus. I am unable to understand the reasons which have 

 led some American authors to follow Spence Bate in using for it the name Bithi/nis. 



