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f 22. Alp heus consobrinus de Man. 



J. G. DE Man, in: Notes from the Leyden Museum. Vol. XXX. 1908. p. 101. 



Stat. 78. June 10/11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 male. 



Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion. 



2 specimens of small size, one of which with eggs. 

 Stat. 115. July 9/1 1. East side of Pajunga-island, Kwandang-bay. Reef. 1 female with eggs. 

 Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. Reef. 1 ova-bearing female. 

 Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings, including Pulu 



Pasi Tanette, near the North point of Saleyer-island. Reef. 1 young specimen. 

 Stat. 299. January 27/29. io°52'.4S., I23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- 



island. Dived to a depth of 36 m. Mud, coral and Lithothamnion. 1 specimen 



without eggs and without the legs of first pair, probably belonging to this species. 

 Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 



36 m. Coral and Lithothamnion. 2 ova-bearing females, one of which is adult, 



and 1 young specimen. 



Closely related to A. bucephalus Cout. and A. clypeatus Cout. 



The male from Stat. 78 is 14,5 mm. long. Rostrum acute, reaching almost to the middle 

 of the visible part of i st antennular article; rostral carina sharp, becomes flattened behind the 

 eyes passing into the surface of the carapace. Frontal margin as in A. bucephalus. Second 

 joint of antennular peduncle one and a half as long as the visible part of the i st , 3 ld joint a 

 little shorter than i st ; stylocerite pointed, broadened at its base and reaching to the distal third 

 of i st joint. Carpocerite extending by half the length of the 3 ld joint beyond the end of the 

 antennular peduncle. The basicerite appears unarmed, but in this specimen like in most others 

 it seems to be broken off, for in the three specimens from Stat. 315 it bears a very small 

 infero-lateral spinule. Scaphocerite resembling that of A. bucephalus, but just reaching beyond 

 the tip of the carpocerite, the blade fringed with hairs ancl as long as the antennular peduncle. 



In the adult female from Stat. 315 which is 15,5 mm. long, the narrow rostrum extends 

 to just beyond the middle of i st article, the 2 nd article is but one-third longer than the visible 

 part of the i st and the carpocerite extends almost by the whole 3" 1 article beyond the end 

 of the antennular peduncle; the acute stylocerite reaches almost to the end of i st article. The 

 ova-bearing female from Stat. 115, 14111111. long, agrees with the preceding one, but the 2 nd 

 antennular article is but little longer than the i st and the carpocerite extends by half the 

 length of 3 rd article beyond the tip of the antennular peduncle. 



In the younger ova-bearing female from Stat. 315, only 8,5 mm, long, finally, the 

 rostrum reaches to the distal third of the visible part of i st antennular article, the 2 nd article 

 is hardly longer than the i st , which is as long as the 3 rd ; the stylocerite reaches to the end 

 of basal article. 



It remained doubtful whether the specimen from Stat. 299 belongs also to this species, 

 because the scaphocerite appears a little shorter than the carpocerite, exactly as in A. bucephalus 

 and because the two legs of the i st pair are missing. 



Telson both in the male ancl in the female s 1 i g h 1 1 y narrower than that of 

 A. bucephalus, its length being in proportion to the width of the posterior margin as 9 : 3 1 /-, 

 in A. bucephalus as 9 : 4. In the adult male from Stat. 78 the telson is 2,7 mm. long, 1,44 mm. 



228 



