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GXATHOPIIYLLUM PANAMENSE. 



147 



ber of rostral teeth a2)pears to vary soraewhat. In two males in this Mnseum 

 the number is four above and one below. In Risso's original description and 

 figure * the rostrum is represented as bearing six teeth above. In the same 

 author's later description ox this animal t the rostrum is said to bear six teeth 

 above and one below, while in the accompanying figure (Plate I., Fig. 4) 

 there are five teeth above and one below. Milne Edwards | describes the 

 rostrum as armed with six to seven teeth above. 



G. pmiamense^ like G. elegans, is very gaily attired. A colored sketch of 

 the fomner species^ drawui from life by Mr. WestergreU; represents the gen- 

 eral ground color of the body to be a dark brown^ ornamented with a multi- 

 tude of whitish spotS; among which are sixteen red spots regularly arranged 

 as shown on Plate E, Fig. 1. The rostrum, eyes, and antennae are pale ochre 

 (the flagellum of the second antenna) orange), the fifth and sixth abdominal 

 segments, telson, and swimmerets are also ochre. The basal joints of the 

 second pair of chelipcds are violet, the merus, carpus, and fingers ochre, the 

 basal part of the propodite orange. The third, fourth and fifth pairs o£ legs 

 are violet. According to liisso and Heller, G, clcgans is spotted with golden- 

 yellow, and otherwise differs in details of coloration from its western relative. 

 In the form described by Gourret§ as G. elegans, var. brevirostris, from Mar- 

 seilles Bay, the 



ground color is brick-red. 



Length, 22.5 mm. ; length of carapace, including rostrum, 7.5 mm. 

 Taken on the reef at Panama, at low tide, March 12. One ovigerous 



female. 



fasclolalum 



from Australia and Amboyna, agrees 



very closely in form with G. elegcms^ but differs wholly in the pattern of its 

 markings and in coloration from both G, clcgans and G. panamcnsc. G. zehra 



fasciolat 



Ortmaun t has lately recorded a Gnathophgllmn from Tahiti as a new species, 



G. paUidam. 



fasciolaium 



marks. This difference may be due to the action of alcohol. 



In the genns Gnalho2)hglhm, the external flagellum of the antennule is 

 double, producing a short third flagellum similar to that of the Palwmoddcc. 



* iiist. Nat. des Crust, ties Environs do Nice, p. 93, Plate IL, Fig. 4, 1816. 

 t Hist. Nat. dc riuropc Mcrid., Y. 71, 182G. 



% Hist. Nat. des Crustaecs, II. 309, 1837. 



§ Comptes llciidus, CV. 1031, 18S7. 



II Proc. Acad. Nat. Sci. Phila., 1800, p. 28. 



* Bciir. zur Meercsfauna der Inscl Mauritius uud dcr Scyclicllcu, ]). IGl, Plate XVII 

 t Zoolog. Jalul)., Abih. f. Syst., V. 537, 1890. 



Pig 



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