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It is to the Paulsoni group that also ought to be referred Syn. tricuspidatits (Heller), 

 a species described by C. Heller in: Sitzungsber. Kais. Akad. Wien, Bd. XLIV, 1 86 1 , p. 267, 

 PI. III, fig. 15 and of which I have treated in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, p. 738 — 742. 

 According to Heller's description the terminal spine of the scaphocerite should somewhat 

 ("etwas") reach beyond the tip of the blade and the carpocerite should be much longer than the 

 latter ("Der Stiel der ausseren Antennen überragt den Vorderrand der Deckplatten bedeutend"). 

 I therefore conclude that in Syn. triatspidatus the terminal spine of the scaphocerite does not 

 project beyond the tip of the carpocerite, a conclusion quite in harmony with my observations 

 on the type specimen of A. tricuspidatus which was examined by me in 1897. That type specimen 

 (de Man, 1. c. p. 742) proved to resemble the specimens from the coast of Atjeh, in which 

 (p. 739) the carpocerite reached just as far forward as the terminal spine of the scaphocerite. 

 When this should be really the case, Syn. tricuspidatus should be a species different from Syn. 

 Paulsoni and its varieties, from Syn. Thcophane de Man, Syn. Mac-Cullochi Cout. and Syn. 

 gracilirostris de Man. In Syn. tricuspidatus the posterior angles of the telson are acute, but 

 very short (1. c. p. 740) and this species is therefore also differentiated from Syn. hastilicrassus 

 Cout., acautliitclsouis Cout. and ancistrorhynichus de Man; it appears by this feature related 

 to Syn. hululensis Cout. and to Syn. tumidomanus (Paulson). In Syn. hululensis, however, the 

 merus of third legs is more than 4-times as long as wide (H. Coutière, Alpheidae Mald. and 

 Lacc. Archip. 1905, p. 877), in Syn. tricuspidatus somewhat more than 3-times (de Man, 1. c. 

 p. 742). Syn. tumidomanus (Paulson) is only known to me by the figure and the few remarks 

 given by Coutière in: Proc U.S. Nat. Mus. XXXVI, 1909, p. 24, so that I am unable to 

 say whether it is identical with Syn. tricuspidatus or not. 



Syn. Mushaensis Cout. appears also related, but in this species the stylocerite is not 

 longer than the lower spine of the basicerite, while in Syn. tricuspidatus this spine is probably 

 shorter than the stylocerite (de Man, 1. c. p. 739). 



Syn. hilaruhis de Man and Syn. Latastei Cout. are apparently also different forms, 

 Syn. tricuspidatus will therefore perhaps prove to be a species that is different from all those 

 mentioned in the key. 



Paulson has also described a variety gracilimanus of his Syn. tumidoiuanus (Coutière, 

 Les Alpheidae, 1S99, p. 26). In another paper of the latter author, in: Proc. U.S. Nat. Mus. 

 XXXVI, 1909, p. 10, this variety, which is fully unknown to me, bears the name of exilinianus. 



Alplieus spiniger Stimps., finally, from the Loo Choo Islands, may also belong to the 

 Paulsoni group, but it appertains perhaps to the Coinatularutn group, in the neighbourhood 

 of Syn. carinatus: it appears impossible to decide this question (Stimpson, in: Proc. Acad. 

 Nat. Scienc. Philadelphia, 1860, p. 31). 



Alplieus biunguiailahis Stimpson (in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 31) 

 ought in my opinion to be considered as a nomen nudum. The few characters indicated by 

 Stimpson are in reality applicable to more than one species, to Syn. brachyccros Nob. for 

 instance. The quite different habitat of Stimpson's A. óiunguiculatus (Hawaiian Islands) and 

 of Coutière's species of the same name (Maldive Archipelago) render it also doubtful whether 



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