534 PYCNOGONIDA CHAI-. 



10 -jointed, and clawed; the terminal joints of the latter bear 

 long straight spines, scattered over their whole surface ; the 

 proboscis is borne on a narrow stalk, and sharply de flexed. The 

 eggs form a single flattened mass, as in Pycnogonum. While the 

 lack of palps would set this genus among the Pallenidae, the 

 remarkable proboscis seems to be better evidence of affinity with 

 Ascorhynchus and Eurycide} 



Xymphopsis, Haswell (1881), is a genus of doubtful affinities, 

 placed here by Schimkewitsch. The first appendage is well- 

 developed and chelate ; the palps are 9 -jointed, the ovigerous 

 legs are 7 -jointed, none of the joints being provided with the 

 compound spines seen in Nymplion and Pallene. It is perhaps 

 an immature form. Schimkewitsch has described another species, 

 N. korotnevi, and Loinan a third, N. muscosus, both from the 

 East Indies. 



Fam. 4. Ammotheidae. Akin to Eurycididae in having 

 the proboscis more or less movably jointed to the cephalic 

 segment, and appendage I. reduced, non-chelate in the adult ; 

 the body is compact and more or less imperfectly segmented ; 

 appendage II. 4- 9 -jointed ; appendage III. ('lawless, and the 

 number of joints sometimes diminished, with a sparse row of 

 serrated spines ; auxiliary claws usually present. 



Ammothea, Leach (1815) (including Acheiia, Hodge (1864) = 

 the old non-chelate individuals): appendage I. very small, 2-jointed; 

 appendage II. 8-9-jointed; caudal segment fused with last body- 

 segment ; about eighteen species, four from the South Seas, tw - 

 or three from the East Indies, the rest mostly Mediterranean 

 and North Atlantic, in need of revision. Ammothea lonyipes, 

 Hodge, is the young of Acheiia hispida, Hodge ; and Ammothea 

 maynirostris, Dohrn, is apparently the same species. A.fibnli- 

 fen'i, Dohrn, seems identical with Acheiia echinata, Hodge (of 

 whicli A. lii-< T/'/ICS, Hodge, is the young), and so probably is A. 

 aril, I mill* *, Wilson; Emli'l* didactyla, Philippi (1843), is very 

 probably the same species. A. uniunyuiculata, Dohrn (?/Vr/7/<v/ 

 i's, Philippi (1843)), has no auxiliary claws. Leionyw- 

 I, Mobius (1902), contains nine Antarctic forms, allied to 

 Ammothea (including A. yrandis, Pfeffer, and Colossendeis gibbosa, 

 Mob., which two are probably identical), with characteristic 



1 Pocock (Encycl. Brit., 10th ed., Art. " Arachnida ") makes Hannonia the 

 solitary type of a family. Cf. Loman, Zool. Jahrb., Syst., xx., 1904, p. 385. 



