605 



MAIIDJE. 



MAIID^E. 



696 



P. Gibbsii is also a British species. It has ' no spines on the lateral 

 margin. It is found on the southern coasts of Devon and Cornwall. 



Litsa (Leach). Very much resembling Pisa, and perhaps ought 

 not to have been separated from it. The distinguishing characters of 

 Litsa consist in the disposition of the rostrum, which is formed of 

 two lamellose horns, truncated anteriorly, and wider anteriorly than 

 they are at their base, and in the absence of spines on the tarsi. 



L. ehiragra is the only species known : its length is about two 

 inches, and the colour an intense red ; the feet are furnished with 

 some hairs, but the trunk is unarmed. 



It is found in the Mediterranean, and is said to have been taken on 

 the coast of Cornwall by Mr. Swainson, but it is not mentioned in 

 Bell's 'British Crustacea.' 



Lilta chiragra. 

 a, abdomen of female ; 6, abdomen of male ; e, antenna. 



M. Milne-Edwards remarks that L. fatirottrii of Mr. Say seems to 

 bear much analogy to Uya* araneitt ; but Milne-Edwards cannot be 

 certain that it belongs to the same genus from the author's description. 



Ilyat (Leach) Approaching very nearly to Pita, and especially to 

 Herbttia, but easily distinguished by the form of the first joint of the 

 external antennae, which, instead of being cylindrical, as in nearly all 

 the Oxyrhynchs, is flattened and enlarged on the external side. Cara- 

 pace rather large, especially anteriorly ; rostrum, which is formed of 

 triangular horua that are flattened and convergent, moderate, and 

 leaving the insertion of the moveable stem of the external antenna; 

 completely visible ; front large ; orbits directed a little forwards ; edges 

 not spiny, and with a single fissure above ; external edge of the basilary 

 joint of the antennae straight, and separated from the external por- 

 tion of the orbit by a very large notch ; the third joint of the external 

 jaw-feet i\ little dilated outwards ; feet disposed as in Pita, except that 

 the four last pairs are longer, and have no spines on the inferior 

 surface of the tarsus. 



H. coarctata (Leach). The carapace of this species is strongly con- 

 tracted beneath the external orbital angles. Length about two inches. 

 Colour yellowish. 



It has been taken in the English Channel. 



II. aranfiu has the carapace not contracted behind the post-orbitnl 

 hastiform process. This is also a British species, and, with the 

 exception of Maia Srjuinado, is the largest of the family found in the 

 British Fauna. 



Naxia (Milne-Edwards) Establishing, in the opinion of M. Milnc- 

 Ed wards, the passage between the genera Lino, and Chorinut of Lead). 

 General form of the body as in Pita and Lima, and the disposition of 

 the rostrum very analogous with that which is proper to Litsa. 

 Naxia is however distinguished from the preceding genera by the 

 deposition of the antennae and orbits. Carapace nearly pear-shaped ; 

 rostrum much resembling that of Lima ; orbits very small, nearly 

 circular, deep, and marked with a fissure above and below, but with- 

 out any hiatus at their inferior border ; basilary joint of the external 

 antenna) wide, but narrow forwards, very much advanced, and com- 

 pletely hidden by the rostrum and the anterior angle of the superior 

 orbital border ;-the moveable stem of these appendages inserted under 

 the rostrum, near theantennary fosset, and not beyond the edge of the 

 external border of that prolongation, as in Pita. Epistome very large. 



ff. tcrpulifera (Pita terpulifera, Milne-Edwards). Length about 

 4 inches. Body covered with a brownish down, and tho carapace often 



Jlyns coarctata. 

 a, male ; b, female. 



encrusted with Flmtrw, Serpnlce, Sponges, and the like. It is brought 

 from Australia. 



flnxia acrjntlifwfr, one-third natural tize. 



o, liinl ] side of the head in detail ; *, one of the protiuding points, -with the 

 eye in profile ; c, abdomen of the female. 



