410 REV. T. E. E. STEBBING ON AMPHIPODA FEOM 



downward in a rounded lobe ; in the fourth pair this joint is more oblong than oval, 

 widest proxitually, whereas in the fifth pair it is much l)roader and widest distally. In 

 the female the last three pairs are shorter and stouter than in the male, with the fourth 

 joint more widened distally. 



Pleopods. There are two or three coupling-spines on the peduncle, and on the inner 

 margin of the first joint of the inner ramus four to five spines, not cleft, but at the 

 apex a little dilated and hooked. 



Uropods. Small ; first pair with lateral spines on only one of the rami ; third with 

 the small ramus sliorter than the peduncle. 



Telson. Nearly square when flattened out, with slightly convex sides, the cleft not 

 reaching beyond the middle, its sides not divergent. 



Length. About 7 mm. 



Eab. Korean and Japanese waters : 31° 40' N., 125 50' E., Tong-kai, in seaweed 

 {Studer collection); M 14' N., 129 34' E., in seaweed, Korea (Andrea); 34° 40' N., 

 129° 50' E., Japan {Andi-ea) ; BT 0' N., 131 20' E. [Studer collection) ; Wladiwostock ? 

 (H. Koch) ; all the specimens belong to the Copenhagen Museum. 



The specific name refers to the hammer-like appearance of the first gnathopods of 

 the male. 



Alloechestes compressus Dana. (Plate 33 B.) 



1852. Allurchestes compressa Dana, Proceedings of the American Academy of Arts and Sciences, vol.^ii. 

 p. 205. 



1852. Allorchestes austruiis Dana, P. Amer. Ac. vol. ii. p. 20G. 



1853. „ Gaimnrdin Dana, United States Exploring Expedition, vol. xiii. p. 884., pi. 60. 

 fig. 1 a-i. 



1853. Allorchestes australis Dana, U.S. Expl. Exp. vol. xiii. p. 892, pi. 60. fig. 7 a-o. 



1862. „ Gaimardii Bate, Catalogue of Amphipodous Crustacea in the British Museum, 



p. 41, pi. 6. fig. 9. 

 1862. Allorchestes australis Bate, Catal. Amph. Brit. Mus. p. 45, pi. 7. fig. 6. 

 1881. Aspidophoreia diemenensis Haswell, Proceedings of the Linnean Society of New South Wales,- 



vol. V. p. 101, pi. 6. fig. 2. 

 1893. Allorchestes {Hyale?) compressa Delia Valle, Fauna und Flora des Golfes Neapel, Monograph 20, 



p. 528 {see also pp. 519, 523). 

 1893. Aspidophoreia (Hijale ?) diemenensis Delia Valle, F. u. Fl. G. Neapel, Mon. 20, p. 530. 



The body is compressed, especially at the pleon. The first four pairs of sidc-j)lates 

 are deep, the fourth being also wide ; the second to the fourth are quadrate, the fifth is 

 shallow. The postero-lateral corners of the third pleon-scgment are quadrate, with 

 minutely-produced point. 



Eyes. Oval, wider apart than the longer diameter. 



Antennce. In young from the marsupium the two pairs are equal ; in the adult the 

 proportions are rather variable. As Bate jioints out, Dana mistook a fused portion of 

 the flagellum in the second pair for a joint of the peduncle. 



First antenna'. Usually rather longer than the peduncle of the second pair ; flageUum 

 consisting of from ten to twenty joints. 



