Species of Maioid Crustacea. 5 



are rather small, palm compressed, and fingers excavate at tips. 

 The ambulatory legs are smooth, decrease regularly in length, 

 and their terminal joints are slightly arcuate and acute. 



The male postabdomen is apparently six-jointed (though 

 now broken at the tip), the penultimate and antepenultimate 

 joints coalescent. Length nearly f inch. 



Hah. Unknown. 



A single male is in the collection. 



The Huenia pyramidata of Heller, from the Red Sea, 

 should perhaps be referred to the genus Trigonothir, but 

 differs from T. obtusirostris in the absence of the lateral 

 rostral carinas, &c. 



The genus Trigonotliir is characterized principally by the 

 form of the prominent obtusely rounded rostrum, which is 

 armed, in T. obtusirostris, with lateral carinas. It is further 

 distinguished from Menmthius by its immobile eyes and the 

 want of a prseocular spine; from Huenia by the latter charac- 

 ter ; and from Simocarcinns by the form of the anterior legs. 



Huenia pacijica, sp. n. (PI. IV. fig. 3.) 



Carapace elongate-triangular, smooth, with three small 

 tubercles on the gastric region, which is somewhat elevated, 

 and a more prominent tubercle on the cardiac region. The 

 antero-lateral margins, which are nearly straight, terminate 

 posteriorly in a small tubercle or spine. The rostrum is very 

 long, slender, compressed, and straight ; the prasocular spine 

 is very small. The basal antennal joint is angulated, and 

 has a very small tubercle at its extero-distal angle. Post- 

 abdomen of male 7-jointed, smooth ; the edge of the sternal 

 plastrum is reflexed, and forms a raised rim around the margin 

 of the terminal postabdominal segment. Length of carapace 

 5 1 lines, rostrum 4 lines. 



Hob. Fiji Islands, Ngau {H.M.S. 'Herald'). 



The description is taken from a male example, in which, 

 unfortunately, all the legs are wanting. 



In a female specimen in the collection from Ovalau in the 

 Fiji group, which may very probably belong to the same 

 species, the rostrum is much shorter, the lateral expansions of 

 the carapace are unequal and separated by a semicircular 

 emargination, the anterior are larger and rounded, the poste- 

 rior truncated at the end. The ambulatory legs are very 

 slender and not at all dilated, with a small tubercle at the 

 distal end of the merus joints. The fourth to sixth postabdo- 

 minal segments coalescent. 



This species differs from the H. proteus, De Haan, and H 



