1918. ] Stanley Kp:mp : Dccapoda of the Inle Lale. 91 



ultimate leg a little less than twice as lonu as broad. The anterior and 

 posterior borders of the propodi are rounded, not keeled as in P. peal- 

 ianuni and the spinules on the posterior border are very small and in- 

 conspicuous. 



In the male abdomen the length of the sixth segment is from one- 

 half to two-thirds the basal breadth. The seventh seiiment is triangular, 

 a little broader than long (text-fig. oe). 



The measurements (in mm.) of the carapace in four specimens are 

 as follows : — 



Sex 



Length 

 Breadth 

 Depth 



I have compared this species with specimens of P. pealianmn, and 

 have pointed out numerous differences in the course of the description 

 given above. P. abhotti, Rathbun,^ and P. rnornatunt. Rathlnm,^ which 

 I have lujt seen, appear to be more closely allied, especially the latter. 



In P. abhotti. which occurs in the Malay Peninsula, the carapace is 

 proportionately narrower than in P. curtobates, about four-fifths as long 

 as broad, the post-frontal crest is tuberculate, the median suture is not 

 defined in front of the epigastric lobes, the palms of the chelae are 

 rougher externally, the legs are more slender and the penultimate seg- 

 ment of the abdomen of the male is shorter. P. inornatum differs in 

 its narrower carapace, more strongly inflated laterally, in the merus of 

 the external maxillipedes which is more square in outline, and in the 

 much broader terminal segments of the abdomen of the male. Other 

 distinctions will doubtless be found on actual comparison of sjiecimens. 



Four specimens of P. curtohafes are in the collection, obtained for Dr. 

 Annandale by Mr. C. E. Browne. They were found in rice- fields near 

 Yawnghwe. The types bear the number 9775/10, Zool. Sure. Ind. 



Family PALAEMONIDAE. 



Subfamily PA LAEMONINAE. 



Palaemon naso, sp. nov. 



Plate XXV, figs. 1-5. 



The rostrum in this species is unusually long, in individuals that are 

 apparently full-grown extending ])eyond the end of the anteniuil scale 

 by about one-third of its length (pi. xxv, figs. 1. 2). In specimens 

 between 30 and 40 mm. in length it is proporrionately rather shorter, 

 reaching beyond the scale l)v about one quarter its length, in its 

 ])r()ximal half the rostrum is straight, but towards the apex is very 

 strongly reflected upwards : the uppei' margin is always consi)icuously 

 concave in front of the eye. There are, in all, from 8 to 1 1 dorsal 

 teeth (nearly always 9 or 10) ^ and from 5 to 8 ventral teeth (usually 



1 Rathhii!!, J'ror. liiul. Sor. Wn.^'/il ih/Iihi. Xll, p. I'T. ]A. 1 (18!)S). 

 ' Ratlibiin, Xotir. Arrh. Miis. I'uris (4), \'l, p. :) I 1. pi. xiv, li,-'. 1 (1<)(M). 

 ^ Of fifty speeirnens four have 8 dor.sal teeth, twenty-four have; 9, twenty have; lO 

 and two have 11. 



