426 DE. J. G. DE MAN ON CEUSTACEA CHIEFLY 



One of the five specimens described (Arcliiv f. Naturg. liii. p. 494) by me in 1888 as a 

 variety amhuinensis, and which were collected by Dr. Brock at Amboiua, is lying before me. 

 It proves now to be a different species from Hqip. vittata, Stimps., and it may hence- 

 forth bear the name of Jlippolysmata amboinensis. The whole animal has a slenderer 

 appearance. The rostrum, the free part of which is almost as long as the carapace, 

 has a much slenderer form than that of Hipp, vittata, and the first tooth of the upper 

 margin is situated at one-fourth the length of the carapace from its frontal border. 

 The sixth segment of the abdomen is fnore elongate, almost twice as long as the fiftli, 

 and barely shorter than the telson. The peduncles of the inner antennae and the 

 antennal scales are more elongate, slenderer, and the stylocerite is shorter than the 

 eyes, rudimentary. The legs are also slenderer. A more detailed description will be 

 published hereafter. 



The following remarks about the single type specimen of Merhippolyte orientalis, 

 Sp. Bate, captured by the ' Challenger ' Expedition at a depth of 800 fathoms off New 

 Guinea, will, I think, be welcome. Dr. Caiman wrote me about it as follows : — " With 

 regard to Merhippolyte orientalis, I am sorry that I cannot give you many details. 

 The type sj)ecinien is in such an extremely bad state that no one except Mr. Spence 

 Bate would have thought for a moment of describing it as a new species ! I attempted 

 to make a sketch of the rostrum etc., but I thought it was not worth the trouble. The eye- 

 peduncles are shorter than the first segment of the antennular peduncle, probably not 

 more than two-thirds of its length, though on account of the membranous consistency 

 of all the parts it is difficult to form an idea of the exact proportions. There is a well- 

 marked pterygostomial spinule on the carajiace. The mandible has an incisor-process 

 and a three-segmented palp. There are ajiparently arthrobranchiye on the perseopods. 

 All the perseopods are wanting. I doubt very much whether it would ever be 

 possible to recognize the species again." 



According to Caiman's latest paper on tbe Hippolytidse (Ann. Mag. Nat. Hist. ser. 7, 

 vol. xvii. January 1906, p. 30), this species seems to be indeed a Merhippolyte. 



Another species, which was described by me in 1892 and in 1902 under the name of 

 Merhippolyte orientalis (in Max Weber's ' Decapoden des Indischen Archipels,' p. 407, 

 and in Abhaudl. Seuckenb. naturforsch. Gesellschaft, Bd. xxv. p. 849), is certainly different 

 from that deep-sea species of the ' Challenger ' Expedition ; it is also different from 

 Mippolysmata vittata and JIip)polysmata amboinensis, and may henceforth bear the name 

 of Jlippolysmata kiikenthali, with some doubt as regards the genus, because the mandible 

 was not examined by me. 



Geographical Distribution o/" Hippolysmata vittata, Stimps. — Hongkong (Stimpsoii and 

 Spence Hate); Cebu {Thullioitz) ; Pulau Bidan, Peuang {Lanchester). 



