CRUSTACEA. 673 



Dorippe DALD., FABR. Shell depressed, anteriorly narrower, 

 truncated. Second and third pairs of feet very long, with last 

 joint long, subulate; fourth and fifth pairs dorsal, short, subcheli- 

 forau Tail inflected downwards. 



Sp. Dorippe lanata Bosc, Cancer lanatus L., DESMAR. Crust. PI. 17, fig. 2 ; 

 from the Mediterranean. 



B. Feet all in the same horizontal plane inserted at the inferior 

 surface of sternum. Tail always inflected downwards. 



f Area of mouth (space bounded by the third pair of maxilli- 

 form feet) triangular, anteriorly narrower, often produced almost as 

 far as the anterior margin of shell. Third pair of maxilliform feet 

 slender or narrowed anteriorly, triangular. 



Family XXXII. Oxystomata EDW. (in part). 



Corystes LATE. External antennae setaceous, ciliated, very long. 

 Shell oblong, oval. First pair of feet cheliform, the rest with last 

 joint subulate, acute, elongate. 



Sp. Corystes dentatus, Albunea dentafa FABR., DESMAR. Crust. PI. 3, fig. 2, 

 BELL Brit. Crust, p. 129, buries under the sand, sending out the antennae 

 alone above it ; the males have shears of twice the length of the body. This 

 species is found on the English and French coasts. 



Atelecyclus LEACH. 



Add genus Thia LEACH and some others, on which see MILNE EDWARDS 

 Hist. nat. des Crust, n. pp. 141 151. 



Leucosia FABR., LATR. External antennae very small, internal 

 concealed in little pits. Eyes minute. Shell solid, mostly rotundato- 

 I ovate. Branchial cavity closed below, no fissure at the bases of 

 maxilliform feet. Tail with four or three segments. 



Several sub-genera proposed by LEACH : Tphis, Nursia, Persephona, 

 Ixa, Philyra, JZbalia, Myra, Ilia. Add Oreophorus RUEPP. 



Note. Here also Bellia EDW., a new genus, seems to be referrible. See 

 Ann. des Sc. nat., 3ienxe SeVie, Tom. IX. 1848, Zoolog. p. 192. 



Sp. Leucosia craniolaris FABR., DESMAR. Crust. PI. 27, fig. 2. 



ffepatus LATR. 



Matuta FABR. Antennae short, external minute. Two anterior 

 liet short, with chela concave internally, crested above ; remaining 

 VOL. I. 43 



