427 



The adult females from Stat. 305 are 24 mm. and 26 mm. long. The large chela of an 

 ova-bearing female, long 24 mm., is 2,86-times as long as high and the proportion between 

 the length of the chela and that of the fingers is 2,35. The smaller chela is 4,3-times as long 

 as high and the fingers are slightly shorter than the palm, the proportion being as 1 : 1,1 ; the 

 upper surface of the dactylus is 3-times as long as broad. The carpal segments of the second 

 legs are 2 mm., 1,7 mm., 0,65 mm., 0,65 mm. and 1 mm. long, the chela is 1,7 mm. long 

 (palm 0,8 mm., fingers 0,9 mm.); third segment i,S6-times as long as thick. Merus of third 

 legs 6,5-times as long as broad, proportion between the length of the propodus and that of 

 the carpus 1,31; dactylus two-fifths the length of the propodus. 



In another ova-bearing female from the same station the carpal segments are 1,94111111., 

 1,74111111., 0,62 mm., 0,62111111. and 0,94 mm. long, the chela is 1,73 mm. long (palm 0,78111111., 

 fingers 0,95111111.) and the third segment is 1,77-times as long as thick. Merus of y d legs 6,3- 

 times as long as broad, proportion between the length of the propodus and that of the carpus 

 1,26; propodus with 9 spinules, dactylus two-fifths of the propodus. 



In these specimens from Stat. 305 the carpus of the second legs agrees with that of 

 the variety Leucothea, but the merus of the third (and fourth) legs appears as slender as in the 

 typical species. 



To this variety the name of imitatrix has been given because the female imitatcs the 

 female of A. sfrenuus in having the dactylus of the small chela also Ba/aefizce/>s-sha.ped. 



64. Alpheus pctcificus Dana. 



Alpheus pacificus J. D. Dana, U. S. Explor. Exped. Crustacea, p. 544, PI. 34, fig. 5. 

 Alpheus pacificus H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 909, PI. LXXXV 



and LXXXVI, fig. 47. 

 Alpheus gracilidigitus E. J. Miers, Report Voyage H. M. S. "Alert", 18S4, p. 2S7. 

 Alpheus gracilidigitus J. G. de Man, in: Max Weber's Zoolog. Ergebn. II, 1S92, p. 406, 



Taf. XXV, fig. 32 and, passim in texto, in: Mémoires Soc. Zool. France, 1S9S, p. 324, 



PI. IV, fig. 5, 5 «. 

 Alpheus gracilidigitus G. Nobili, in : Annali Mus. Civ. Storia Nat. Genova, Serie 2», Vol. XX, 



1S99, p. 233. 



Stat. 33. March 24/26. Bay of Pidjot, Lombok. 22 m. and less. Mud, coral and coralsand. 

 1 male. 



Stat. 58. April 25. Anchorage off Seba, Savu. Reef. 3 ova-bearing females of different size. 



Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. Reef. 4 speci- 

 mens, 3 of which with eggs. 



Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. Reef. 16 specimens of small 

 size, many of which, however, are ova-bearing. 



Stat. 144. August 7/9. Anchorage north of Salomakiëe-(Damar)-island. Reef. 3 young speci- 

 mens, 1 of which with eggs. 



Stat. 169. August 23/25. Anchorage off Atjatuning, West coast of New Guinea. Reef. 2 spe- 

 cimens, probably males. 



Stat. 193. September 13/14. Sanana-bay, East coast of Sula Besi. Reef. 1 very young specimen. 



Stat. 209. September 23. Anchorage off the South point of Kabaëna-island. Reef. 1 very 

 young specimen. 



Stat. 225°. November 8. South-Lucipara-island. Reef. 1 very young specimen. 



29S 



