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



ii. Systematic JSfotes and Descri2)tions of Neio Genera 

 and Species. 



Family Pal^monid^. 



Pal^mon moorei Caiman. (Plate XI. figs. 1 & 1 a.) 



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

 figs. 20-24. 



The numerous and excellently-preserved specimens of this species 

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

 further details to the description which I formerly gave. Of 18 

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

 remarkable fact, since in this genus, as Couti^re remarks, it is 

 rare foi- 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 ' t ^ . 



The second pair of pereeopods in the females (Plate XI. figs. 1 & 

 la) difier from those of the male formerly figvired, and from those 

 of the two males in the present 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 stoiitness of the chelfe. The carpus and 

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

 not well shown in the figure formei-ly 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 conforms to the 

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



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

 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 remarks. After noticing that P. moorei 

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

 has, at first sight, quite the genei-al appearance of some species of 



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

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

 led some Amei-ican authors to follow Spence Bate in using for it the name Bithynis. 



