318 MR. E. J. MTEES'.S EEVISION OF THE HIPPIDEA. 



Hah. Australian Seas {Coll. Mus. Faris, Brit.); Eed Sea 

 (Heller) ; Mauritius (Co /Z. Mus. Brit.) ; Zanzibar (v. der Dechen)-, 

 Keunion (Maillard) ; Nicobars (Heller) ; Sooloo Island (Dana) ; 

 Moluccas, riores (v. Martens); Philippines (Coll. Brit. Mus.); 

 Ousima (Stimpson) ; New Hebrides, Mallicollo (Coll. Brit. Mus.) ; 

 Fiji Islands, Ovalau (Dana; Coll. Brit. Mus.); Samoa or Navi- 

 gators' Islands (Coll. Brit. Mus.) ; Sandwich Islands (Dana) ; 

 Tahiti (Heller, Coll. Brit. Mus.); California, Cape St. Lucas 

 (JStimpson, Coll. Brit. Mus.). 



This species, as has already been observed, is the most common 

 and widely distributed of the family, and varies somewhat in the 

 form of the frontal lobes, tarsal joints, &c. In the figure given 

 by Milne-Edwards, in the 3rd edition of Cuvier's 'Eegne Animal,' 

 and Guerin in the ' Iconographie,' and in specimens observed by 

 Hilgendorf from Zanzibar, as in one specimen in the British- 

 Museum collection, from Australia, there is a small tooth in the 

 notch separating the median frontal teeth ; but this peculiarity 

 can hardly be considered to indicate a distinct variety of the 

 species. The greater number of the specimens in the Museum 

 are of the female sex ; and between these and the males I have 

 not remarked any striking sexual distinctions ; the terminal 

 segment of the male, however, is narrower than that of the 

 female. The length of the carapace of the largest specimens in 

 the collection does not exceed 1^ in. 



I have not discovered among the Banksian specimens now in 

 the British Museum the type specimen of Fabricius's H. adactyla, 

 which has been referred to by Milne-Edwards as synonymous 

 with this species, but is described as having cauda inflexa, 

 articulo primo longitudine tlioracis,^^ which certainly does not 

 apply to it , and I therefore retain the designation testudinarius, 

 by which it is generally known. 



I follow Hilgendorf in uniting B. pictus, Heller, and B. ovalis, 

 Edw., with this species, as no characters are given which suffice 

 to distinguish them from the common form. The same may be 

 said of jffi. pacijicus and hirtipes, Dana : of the former species 

 specimens from the Smithsonian Institution are in the British- 

 Museum collection which certainly belong to B. testudinarius. 



Var. DENTICULATIFEONS. PI. V. fig. 2. 



Remipes denticulatifrons, White, List Crust. Brit. Mus. p. 57 (1847), 

 sine descr. 



