389 

 Gen. 1. SyrrhOG, Goes, 1865. 



Body comparatively slender, with rather thin integuments. Cephalon 

 strongly vaulted in front, and produced to a sharp rostrum curving down 

 between the bases of the superior antennse. Coxal plates comparatively small, 

 3rd pair much the largest, and greatly expanded in their outer part; 4th pair 

 very poorly developed. Posterior edge of the segments of metasome more 

 or less distinctly serrated. Eyes completely coalescent, and placed within the 

 dorsal part of the cephalon, as in the (EdiceridfC. Antennse comparatively 

 slender, the inferior ones in male greatly elongated. Anterior lip moderately 

 broad, and scarcely insinuated at the tip; posterior lip with the lateral 

 lobes greatly expanded. Mandibles short and stout, with the cutting edge 

 distinctly dentated, and the molar expansion of normal structure, palp slender, 

 with the last joint very small, and provided with long curved setae. First 

 pair of maxillse with the palp well developed, masticatory lobe transversely 

 truncated at the tip, and armed with strong denticulated spines, basal lobe 

 of moderate size, and edged with several plumose setae. Second pair of max- 

 illse comparativelv small, with the lobes short and subequal. Maxillipeds not 

 very large, masticatory lobes of moderate size, and armed along the inner 

 edge with curved spines, assuming at the tip successively the character of 

 strong setae, palp comparatively short and stout, with the 3rd joint expanded 

 distally, and the terminal one unguiform. Gnathopoda very slender and feeble 

 in structure, the posterior ones more elongated than the anterior, propodos in 

 both distinctly subcheliform, with the palm transverse, and armed with a single, 

 very strong, denticulated spine, which forms, as it were, a kind of thumb 

 against which the dactylus is allowed to impinge. The 2 anterior pairs of 

 pereiopoda extremely slender, though considerably shorter than the 3 posterior 

 pairs, which rapidly increase in length, and have the basal joint considerably 

 expanded and more or less strongly serrated along the posterior edge. The 

 2 anterior pairs of uropoda subequal in structure, with both rami narrow 

 linear in form, the outer being much shorter than the inner; last pair with 

 the rami less unequal and narrowly lanceolate in shape, the outer with a 

 small terminal joint. Telson more or less elongated and deeply cleft. 



Remarks. The present genus, which may be considered as the type 

 of the family Syrrhoidce, was established by Goes in the year 1865, to include 

 2 species, one of which, however, had been described by Prof. Lilljeborg at a 

 somewhat earlier date as the type of a separate genus, Tiron. Among the 

 several characteristics distinguishing the present genus from the succeeding 

 ones, may be named the comparatively slender form of the body, the large 

 confluent eyes, and the very peculiar form of the 3rd pair of coxal plates. 



50 Crustacea. 



