GNATHOPHYLLUM PANAMENSE. 147 
ber of rostral teeth appears to vary somewhat. In two males in this Museum 
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 or this animal ¢ 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. panamense, like G. elegans, is very gaily attired. A colored sketch of 
the former species, drawn from life by Mr. Westergren, 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 K, Fig. 1. The rostrum, eyes, and antenne are pale ochre 
(the flagellum of the second antennz orange), the fifth and sixth abdominal 
segments, telson, and swimmerets are also ochre. The basal joints of the 
second pair of chelipeds are violet, the merus, carpus, and fingers ochre, the 
basal part of the propodite orange. The third, fourth and fifth pairs of legs 
are violet. According to Risso and Heller, G. elegans 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. 
Gnathophyllum fasciolatum Stimps.,\| from Australia and Amboyna, agrees 
very closely in form with (. elegans, but differs wholly in the pattern of its 
markings and in coloration from both G. elegans and G. panamense. G. zebra 
Richters,* from Mauritius, is without much doubt the same as G. fasciolatum. 
Ortmann f has lately recorded a Gnathophyllum from Tahiti as a new species, 
G. pallidum. It differs from G. fasciolatum only in the absence of color- 
marks. This difference may be due to the action of alcohol. 
In the genus Gnathophyllum, the external flagellum of the antennule is 
double, producing a short third flagellum similar to that of the Palemonide. 
* Hist. Nat. des Crust. des Environs de Nice, p. 93, Plate IL., Fig. 4, 1816. 
+ Hist. Nat. de Europe Mérid., V. 71, 1826, 
¢ Hist. Nat. des Crustacés, II. 369, 1837. 
§ Comptes Rendus, CV. 1034, 1887. 
|| Proc. Acad. Nat. Sci. Phila., 1860, p. 28. 
* Beitr. zur Meeresfauna der Insel Mauritius und der Seychellen, p. 161, Plate XVII. Fig. 18-20, 1880. 
+ Zoolog. Jahrb., Abth. f. Syst., V. 537, 1890. 
