Species of Maioid Crustacea.. 17 



Hob. Totoya, Fiji Islands {H.M.S. 'Herald')- Port 

 Curtis (H.M.S. 'Herald 1 ). 



Notwithstanding the small size of the specimens, they have 

 all the appearance of being adult. 



There is in the Museum collection a female example from 

 the Gulf of Suez (Mac Andrew) y which seems to belong to this 

 species. 



The genus Parathoe, as its name imports, is most nearly 

 allied to Thoe t Bell, but differs in the much narrower basal 

 antennal joint, and in the non-dilatation of the merus joints 

 of the ambulatory legs. From Mithrax, which it may be 

 supposed to represent in the Indo-Pacific seas, it differs in 

 the first- mentioned character and also in the form of the 

 carapace and absence of antero-lateral marginal teeth. 



Parthenopidae. 



Lambrus. 



The genus Lambrus is one which is remarkable for the 

 number and variety of its species ; and it greatly stands in 

 need of revision. Several of the described forms are insuffi- 

 ciently characterized ; and it is therefore not without consider- 

 able hesitation that I have described so many below as new 

 to science. The genus can be conveniently divided into 

 two subgenera : — the first containing the typical Lambri*, in 

 which the carapace is rhomboidal rather than triangular, or 

 rounded behind, and the anterior legs greatly elongated, con- 

 siderably more than twice the length of the body, and more 

 or less spinose ; the second containing those forms in which 

 the carapace is subtriangular, somewhat produced over the 

 bases of the ambulatory legs at its postero-lateral angles, with 

 the posterior margin straight or nearly so, and the anterior 

 legs shorter, rarely exceeding twice the length of the carapace. 



In the first of these subgenera the species may be further 

 subdivided, according as the merus joints of the ambulatory 

 legs are or are not spinulose along their margins. The second 

 subgenus, in the shortness of the anterior legs, approaches Par- 

 thenope, and contains several forms which have been described 

 as members of that genus. I believe it to be more conveni- 

 ent, however, to restrict the designation Parthenope to the 

 long-known P. horrida, Lam., and its near ally P. spinosis- 

 stma, A. M. -Edwards, which are characterized by the greater 

 development of the basal antennal joint and of the spines of 

 the ambulatory legs. 



* The type of this subgenus is L. longimanus, and not, as stated by a 

 lapsus calami in Journ. Linn. Soc. xiv. p. 072, L. crenulatus, Saus. 



Ann. &Mag. N. Hist. Ser. 5. Vol. iv. 2 



