1918.] Stanley Kemp : Dccapoda of the Inle Lahe. 91 



ultimate lei;' 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- 

 ianum 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 segment is triangular, 

 a little broader than long (text-fig. 3c). 



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

 as follows : — 



Sex ... ... (? S S ? 



Length ... ... 40-5 32-2 28-0 32-5 



Breadth ... ... r)7-6 44-8 38-4 44-8 



Depth ... ... 31-7 2(v2 22-2 2o-() 



I have compared this species wdth specimens of P. fealianuni and 

 have pointed out numerous differences in the course of the description 

 given above. P. abhotti, Rathbuji,^ and P. mornatum, Rathlntn,- which 

 I have not seen, appear to be more closely allied, especially the latter. 



In P. abhotti, w^hich occurs in the Malay Peninsula, the carapace is 

 proportionately narrower than in P. curtohates, 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 specimens. 



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

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

 Yawnghw^e. The types bear the number 9775/10, Zool. Surv. Incl. 



Family PALAEMONIDAE. 

 Subfamily PALAEMONINAE. 

 Palaemon naso, sp. nov. 

 Plate XXV, figs. 1-5. 



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

 apparently full-growm extending beyond the end of the antennal scale 

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

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

 reaching beyond the scale by about one quarter its length. In its 

 proximal half the rostrum is straight, but tow^ards the apex is very 

 strongly reflected upwards : the upper margin is always conspicuously 

 concave in front of the eye. There are, in all, from 8 to 11 dorsal 

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



1 Rathbun, Proc. Biol. Soc. Washington, XII, p. 27, pi. 1 (1898). 



2 Rathbun, Nouv. Arch. Mus. Paris (4), VI, p. 311, ph xiv, fig. 1 (1904). 



3 Of fifty specimens four have 8 dorsal teeth, twenty-four have 9, twenty have 10 

 and two have 11. 



