6 Mr. E. J. Miers on new or little-known 



heraldica, White, in the much longer, slenderer rostrum of the 

 male, which is not vertically deep as in those species. 



H. Grandidieri, A. M.-Edwards, from Zanzibar, is founded 

 on a female example, which differs from the female from the 

 Fijis in the Museum collection in the truncated anterior 

 lateral and subacute posterior lateral lobes of the carapace. H. 

 depressa, A. M.-Edwards, also founded on a female example, 

 seems to belong to the following genus (Simocarcinus). 



Simocarcinus, Miers. 



I propose to establish a new generic division under the 

 above name for the species Simocarcinus simplex, typified by 

 the Huenia simplex, Dana, from the Sandwich Islands, which 

 differs from the typical Huenice in having a more robust body, 

 much shorter rostrum, no prseocular spine, the lateral lobes of 

 the carapace in the female much smaller, the anterior legs in 

 the male with the palms turgid, not compressed, and ambu- 

 latory legs cylindrical, not compressed or dilated. 



The two species described by Dana (H. simplex and H. 

 brevirostrata) are, beyond a doubt, the male and female of one 

 and the same form. Specimens from the Sandwich Islands 

 are in the collection of the British Museum, of both sexes. 

 The females in the Museum collection differ slightly from that 

 figured by Dana in having the anterior lateral lobes of the 

 carapace larger and subtruncated ; but this is perhaps due to 

 the age of the specimens. 



Cyclonyx, gen. nov. 



This new generic division is established for the remarkable 

 species described by White as Huenia frontalis (P. Z. S. 1847, 

 p. 223 ; and Zool. Samarang, Crust, p. 21, pi. iv. f. 3, 1848). 

 The single specimen in the British Museum is apparently 

 the exuvia of a female, and resembles the females of Huenia 

 in the laterally expanded carapace ; but in Cyclonyx frontalis 

 the lateral expansions are continuous, not divided into ante- 

 rior and posterior lobes. The rostrum is flattened and of a 

 transversely oval form, and completely conceals the flagellum 

 of the antenna}, whose basal joint is scarcely distinguishable 

 from the surrounding parts of the body. The eyes are set in 

 the narrow emargination between the margins of the carapace 

 and rostrum. The epistome is short. The outer maxillipedes 

 have the merus joint small and not much produced at its 

 antero-external angle. The anterior legs are now wanting. 

 The ambulatory legs (of which only the second and third are 

 now perfect) are angulatcd, cristate above, the penultimate 



